import { QueryResult } from "../../query-runner/QueryResult";
import { QueryFailedError } from "../../error/QueryFailedError";
import { QueryRunnerAlreadyReleasedError } from "../../error/QueryRunnerAlreadyReleasedError";
import { TransactionNotStartedError } from "../../error/TransactionNotStartedError";
import { BaseQueryRunner } from "../../query-runner/BaseQueryRunner";
import { Table } from "../../schema-builder/table/Table";
import { TableCheck } from "../../schema-builder/table/TableCheck";
import { TableColumn } from "../../schema-builder/table/TableColumn";
import { TableForeignKey } from "../../schema-builder/table/TableForeignKey";
import { TableIndex } from "../../schema-builder/table/TableIndex";
import { TableUnique } from "../../schema-builder/table/TableUnique";
import { View } from "../../schema-builder/view/View";
import { Broadcaster } from "../../subscriber/Broadcaster";
import { OrmUtils } from "../../util/OrmUtils";
import { Query } from "../Query";
import { TypeORMError } from "../../error";
import { QueryLock } from "../../query-runner/QueryLock";
import { MetadataTableType } from "../types/MetadataTableType";
import { InstanceChecker } from "../../util/InstanceChecker";
/**
 * Runs queries on a single SQL Server database connection.
 */
export class SqlServerQueryRunner extends BaseQueryRunner {
    // -------------------------------------------------------------------------
    // Constructor
    // -------------------------------------------------------------------------
    constructor(driver, mode) {
        super();
        // -------------------------------------------------------------------------
        // Private Properties
        // -------------------------------------------------------------------------
        this.lock = new QueryLock();
        this.driver = driver;
        this.connection = driver.connection;
        this.broadcaster = new Broadcaster(this);
        this.mode = mode;
    }
    // -------------------------------------------------------------------------
    // Public Methods
    // -------------------------------------------------------------------------
    /**
     * Creates/uses database connection from the connection pool to perform further operations.
     * Returns obtained database connection.
     */
    connect() {
        return Promise.resolve();
    }
    /**
     * Releases used database connection.
     * You cannot use query runner methods once its released.
     */
    release() {
        this.isReleased = true;
        return Promise.resolve();
    }
    /**
     * Starts transaction.
     */
    async startTransaction(isolationLevel) {
        if (this.isReleased)
            throw new QueryRunnerAlreadyReleasedError();
        this.isTransactionActive = true;
        try {
            await this.broadcaster.broadcast("BeforeTransactionStart");
        }
        catch (err) {
            this.isTransactionActive = false;
            throw err;
        }
        await new Promise(async (ok, fail) => {
            const transactionCallback = (err) => {
                if (err) {
                    this.isTransactionActive = false;
                    return fail(err);
                }
                ok();
            };
            if (this.transactionDepth === 0) {
                const pool = await (this.mode === "slave"
                    ? this.driver.obtainSlaveConnection()
                    : this.driver.obtainMasterConnection());
                this.databaseConnection = pool.transaction();
                this.connection.logger.logQuery("BEGIN TRANSACTION");
                if (isolationLevel) {
                    this.databaseConnection.begin(this.convertIsolationLevel(isolationLevel), transactionCallback);
                    this.connection.logger.logQuery("SET TRANSACTION ISOLATION LEVEL " + isolationLevel);
                }
                else {
                    this.databaseConnection.begin(transactionCallback);
                }
            }
            else {
                await this.query(`SAVE TRANSACTION typeorm_${this.transactionDepth}`);
                ok();
            }
            this.transactionDepth += 1;
        });
        await this.broadcaster.broadcast("AfterTransactionStart");
    }
    /**
     * Commits transaction.
     * Error will be thrown if transaction was not started.
     */
    async commitTransaction() {
        if (this.isReleased)
            throw new QueryRunnerAlreadyReleasedError();
        if (!this.isTransactionActive)
            throw new TransactionNotStartedError();
        await this.broadcaster.broadcast("BeforeTransactionCommit");
        if (this.transactionDepth === 1) {
            return new Promise((ok, fail) => {
                this.databaseConnection.commit(async (err) => {
                    if (err)
                        return fail(err);
                    this.isTransactionActive = false;
                    this.databaseConnection = null;
                    await this.broadcaster.broadcast("AfterTransactionCommit");
                    ok();
                    this.connection.logger.logQuery("COMMIT");
                    this.transactionDepth -= 1;
                });
            });
        }
        this.transactionDepth -= 1;
    }
    /**
     * Rollbacks transaction.
     * Error will be thrown if transaction was not started.
     */
    async rollbackTransaction() {
        if (this.isReleased)
            throw new QueryRunnerAlreadyReleasedError();
        if (!this.isTransactionActive)
            throw new TransactionNotStartedError();
        await this.broadcaster.broadcast("BeforeTransactionRollback");
        if (this.transactionDepth > 1) {
            await this.query(`ROLLBACK TRANSACTION typeorm_${this.transactionDepth - 1}`);
            this.transactionDepth -= 1;
        }
        else {
            return new Promise((ok, fail) => {
                this.databaseConnection.rollback(async (err) => {
                    if (err)
                        return fail(err);
                    this.isTransactionActive = false;
                    this.databaseConnection = null;
                    await this.broadcaster.broadcast("AfterTransactionRollback");
                    ok();
                    this.connection.logger.logQuery("ROLLBACK");
                    this.transactionDepth -= 1;
                });
            });
        }
    }
    /**
     * Executes a given SQL query.
     */
    async query(query, parameters, useStructuredResult = false) {
        if (this.isReleased)
            throw new QueryRunnerAlreadyReleasedError();
        const release = await this.lock.acquire();
        try {
            this.driver.connection.logger.logQuery(query, parameters, this);
            const pool = await (this.mode === "slave"
                ? this.driver.obtainSlaveConnection()
                : this.driver.obtainMasterConnection());
            const request = new this.driver.mssql.Request(this.isTransactionActive ? this.databaseConnection : pool);
            if (parameters && parameters.length) {
                parameters.forEach((parameter, index) => {
                    const parameterName = index.toString();
                    if (InstanceChecker.isMssqlParameter(parameter)) {
                        const mssqlParameter = this.mssqlParameterToNativeParameter(parameter);
                        if (mssqlParameter) {
                            request.input(parameterName, mssqlParameter, parameter.value);
                        }
                        else {
                            request.input(parameterName, parameter.value);
                        }
                    }
                    else {
                        request.input(parameterName, parameter);
                    }
                });
            }
            const queryStartTime = +new Date();
            const raw = await new Promise((ok, fail) => {
                request.query(query, (err, raw) => {
                    // log slow queries if maxQueryExecution time is set
                    const maxQueryExecutionTime = this.driver.options.maxQueryExecutionTime;
                    const queryEndTime = +new Date();
                    const queryExecutionTime = queryEndTime - queryStartTime;
                    if (maxQueryExecutionTime &&
                        queryExecutionTime > maxQueryExecutionTime) {
                        this.driver.connection.logger.logQuerySlow(queryExecutionTime, query, parameters, this);
                    }
                    if (err) {
                        fail(new QueryFailedError(query, parameters, err));
                    }
                    ok(raw);
                });
            });
            const result = new QueryResult();
            if (raw === null || raw === void 0 ? void 0 : raw.hasOwnProperty("recordset")) {
                result.records = raw.recordset;
            }
            if (raw === null || raw === void 0 ? void 0 : raw.hasOwnProperty("rowsAffected")) {
                result.affected = raw.rowsAffected[0];
            }
            const queryType = query.slice(0, query.indexOf(" "));
            switch (queryType) {
                case "DELETE":
                    // for DELETE query additionally return number of affected rows
                    result.raw = [raw.recordset, raw.rowsAffected[0]];
                    break;
                default:
                    result.raw = raw.recordset;
            }
            if (useStructuredResult) {
                return result;
            }
            else {
                return result.raw;
            }
        }
        catch (err) {
            this.driver.connection.logger.logQueryError(err, query, parameters, this);
            throw err;
        }
        finally {
            release();
        }
    }
    /**
     * Returns raw data stream.
     */
    async stream(query, parameters, onEnd, onError) {
        if (this.isReleased)
            throw new QueryRunnerAlreadyReleasedError();
        const release = await this.lock.acquire();
        this.driver.connection.logger.logQuery(query, parameters, this);
        const pool = await (this.mode === "slave"
            ? this.driver.obtainSlaveConnection()
            : this.driver.obtainMasterConnection());
        const request = new this.driver.mssql.Request(this.isTransactionActive ? this.databaseConnection : pool);
        if (parameters && parameters.length) {
            parameters.forEach((parameter, index) => {
                const parameterName = index.toString();
                if (InstanceChecker.isMssqlParameter(parameter)) {
                    request.input(parameterName, this.mssqlParameterToNativeParameter(parameter), parameter.value);
                }
                else {
                    request.input(parameterName, parameter);
                }
            });
        }
        request.query(query);
        const streamRequest = request.toReadableStream();
        streamRequest.on("error", (err) => {
            release();
            this.driver.connection.logger.logQueryError(err, query, parameters, this);
        });
        streamRequest.on("end", () => {
            release();
        });
        if (onEnd) {
            streamRequest.on("end", onEnd);
        }
        if (onError) {
            streamRequest.on("error", onError);
        }
        return streamRequest;
    }
    /**
     * Returns all available database names including system databases.
     */
    async getDatabases() {
        const results = await this.query(`EXEC sp_databases`);
        return results.map((result) => result["DATABASE_NAME"]);
    }
    /**
     * Returns all available schema names including system schemas.
     * If database parameter specified, returns schemas of that database.
     */
    async getSchemas(database) {
        const query = database
            ? `SELECT * FROM "${database}"."sys"."schema"`
            : `SELECT * FROM "sys"."schemas"`;
        const results = await this.query(query);
        return results.map((result) => result["name"]);
    }
    /**
     * Checks if database with the given name exist.
     */
    async hasDatabase(database) {
        const result = await this.query(`SELECT DB_ID('${database}') as "db_id"`);
        const dbId = result[0]["db_id"];
        return !!dbId;
    }
    /**
     * Loads currently using database
     */
    async getCurrentDatabase() {
        const currentDBQuery = await this.query(`SELECT DB_NAME() AS "db_name"`);
        return currentDBQuery[0]["db_name"];
    }
    /**
     * Checks if schema with the given name exist.
     */
    async hasSchema(schema) {
        const result = await this.query(`SELECT SCHEMA_ID('${schema}') as "schema_id"`);
        const schemaId = result[0]["schema_id"];
        return !!schemaId;
    }
    /**
     * Loads currently using database schema
     */
    async getCurrentSchema() {
        const currentSchemaQuery = await this.query(`SELECT SCHEMA_NAME() AS "schema_name"`);
        return currentSchemaQuery[0]["schema_name"];
    }
    /**
     * Checks if table with the given name exist in the database.
     */
    async hasTable(tableOrName) {
        const parsedTableName = this.driver.parseTableName(tableOrName);
        if (!parsedTableName.database) {
            parsedTableName.database = await this.getCurrentDatabase();
        }
        if (!parsedTableName.schema) {
            parsedTableName.schema = await this.getCurrentSchema();
        }
        const sql = `SELECT * FROM "${parsedTableName.database}"."INFORMATION_SCHEMA"."TABLES" WHERE "TABLE_NAME" = '${parsedTableName.tableName}' AND "TABLE_SCHEMA" = '${parsedTableName.schema}'`;
        const result = await this.query(sql);
        return result.length ? true : false;
    }
    /**
     * Checks if column exist in the table.
     */
    async hasColumn(tableOrName, columnName) {
        const parsedTableName = this.driver.parseTableName(tableOrName);
        if (!parsedTableName.database) {
            parsedTableName.database = await this.getCurrentDatabase();
        }
        if (!parsedTableName.schema) {
            parsedTableName.schema = await this.getCurrentSchema();
        }
        const sql = `SELECT * FROM "${parsedTableName.database}"."INFORMATION_SCHEMA"."COLUMNS" WHERE "TABLE_NAME" = '${parsedTableName.tableName}' AND "TABLE_SCHEMA" = '${parsedTableName.schema}' AND "COLUMN_NAME" = '${columnName}'`;
        const result = await this.query(sql);
        return result.length ? true : false;
    }
    /**
     * Creates a new database.
     */
    async createDatabase(database, ifNotExist) {
        const up = ifNotExist
            ? `IF DB_ID('${database}') IS NULL CREATE DATABASE "${database}"`
            : `CREATE DATABASE "${database}"`;
        const down = `DROP DATABASE "${database}"`;
        await this.executeQueries(new Query(up), new Query(down));
    }
    /**
     * Drops database.
     */
    async dropDatabase(database, ifExist) {
        const up = ifExist
            ? `IF DB_ID('${database}') IS NOT NULL DROP DATABASE "${database}"`
            : `DROP DATABASE "${database}"`;
        const down = `CREATE DATABASE "${database}"`;
        await this.executeQueries(new Query(up), new Query(down));
    }
    /**
     * Creates table schema.
     * If database name also specified (e.g. 'dbName.schemaName') schema will be created in specified database.
     */
    async createSchema(schemaPath, ifNotExist) {
        const upQueries = [];
        const downQueries = [];
        if (schemaPath.indexOf(".") === -1) {
            const upQuery = ifNotExist
                ? `IF SCHEMA_ID('${schemaPath}') IS NULL BEGIN EXEC ('CREATE SCHEMA "${schemaPath}"') END`
                : `CREATE SCHEMA "${schemaPath}"`;
            upQueries.push(new Query(upQuery));
            downQueries.push(new Query(`DROP SCHEMA "${schemaPath}"`));
        }
        else {
            const dbName = schemaPath.split(".")[0];
            const schema = schemaPath.split(".")[1];
            const currentDB = await this.getCurrentDatabase();
            upQueries.push(new Query(`USE "${dbName}"`));
            downQueries.push(new Query(`USE "${currentDB}"`));
            const upQuery = ifNotExist
                ? `IF SCHEMA_ID('${schema}') IS NULL BEGIN EXEC ('CREATE SCHEMA "${schema}"') END`
                : `CREATE SCHEMA "${schema}"`;
            upQueries.push(new Query(upQuery));
            downQueries.push(new Query(`DROP SCHEMA "${schema}"`));
            upQueries.push(new Query(`USE "${currentDB}"`));
            downQueries.push(new Query(`USE "${dbName}"`));
        }
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Drops table schema.
     * If database name also specified (e.g. 'dbName.schemaName') schema will be dropped in specified database.
     */
    async dropSchema(schemaPath, ifExist) {
        const upQueries = [];
        const downQueries = [];
        if (schemaPath.indexOf(".") === -1) {
            const upQuery = ifExist
                ? `IF SCHEMA_ID('${schemaPath}') IS NULL BEGIN EXEC ('DROP SCHEMA "${schemaPath}"') END`
                : `DROP SCHEMA "${schemaPath}"`;
            upQueries.push(new Query(upQuery));
            downQueries.push(new Query(`CREATE SCHEMA "${schemaPath}"`));
        }
        else {
            const dbName = schemaPath.split(".")[0];
            const schema = schemaPath.split(".")[1];
            const currentDB = await this.getCurrentDatabase();
            upQueries.push(new Query(`USE "${dbName}"`));
            downQueries.push(new Query(`USE "${currentDB}"`));
            const upQuery = ifExist
                ? `IF SCHEMA_ID('${schema}') IS NULL BEGIN EXEC ('DROP SCHEMA "${schema}"') END`
                : `DROP SCHEMA "${schema}"`;
            upQueries.push(new Query(upQuery));
            downQueries.push(new Query(`CREATE SCHEMA "${schema}"`));
            upQueries.push(new Query(`USE "${currentDB}"`));
            downQueries.push(new Query(`USE "${dbName}"`));
        }
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Creates a new table.
     */
    async createTable(table, ifNotExist = false, createForeignKeys = true, createIndices = true) {
        if (ifNotExist) {
            const isTableExist = await this.hasTable(table);
            if (isTableExist)
                return Promise.resolve();
        }
        const upQueries = [];
        const downQueries = [];
        upQueries.push(this.createTableSql(table, createForeignKeys));
        downQueries.push(this.dropTableSql(table));
        // if createForeignKeys is true, we must drop created foreign keys in down query.
        // createTable does not need separate method to create foreign keys, because it create fk's in the same query with table creation.
        if (createForeignKeys)
            table.foreignKeys.forEach((foreignKey) => downQueries.push(this.dropForeignKeySql(table, foreignKey)));
        if (createIndices) {
            table.indices.forEach((index) => {
                // new index may be passed without name. In this case we generate index name manually.
                if (!index.name)
                    index.name = this.connection.namingStrategy.indexName(table, index.columnNames, index.where);
                upQueries.push(this.createIndexSql(table, index));
                downQueries.push(this.dropIndexSql(table, index));
            });
        }
        // if table have column with generated type, we must add the expression to the metadata table
        const generatedColumns = table.columns.filter((column) => column.generatedType && column.asExpression);
        for (const column of generatedColumns) {
            const parsedTableName = this.driver.parseTableName(table);
            if (!parsedTableName.schema) {
                parsedTableName.schema = await this.getCurrentSchema();
            }
            const insertQuery = this.insertTypeormMetadataSql({
                database: parsedTableName.database,
                schema: parsedTableName.schema,
                table: parsedTableName.tableName,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
                value: column.asExpression,
            });
            const deleteQuery = this.deleteTypeormMetadataSql({
                database: parsedTableName.database,
                schema: parsedTableName.schema,
                table: parsedTableName.tableName,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
            });
            upQueries.push(insertQuery);
            downQueries.push(deleteQuery);
        }
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Drops the table.
     */
    async dropTable(tableOrName, ifExist, dropForeignKeys = true, dropIndices = true) {
        if (ifExist) {
            const isTableExist = await this.hasTable(tableOrName);
            if (!isTableExist)
                return Promise.resolve();
        }
        // if dropTable called with dropForeignKeys = true, we must create foreign keys in down query.
        const createForeignKeys = dropForeignKeys;
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const upQueries = [];
        const downQueries = [];
        // It needs because if table does not exist and dropForeignKeys or dropIndices is true, we don't need
        // to perform drop queries for foreign keys and indices.
        if (dropIndices) {
            table.indices.forEach((index) => {
                upQueries.push(this.dropIndexSql(table, index));
                downQueries.push(this.createIndexSql(table, index));
            });
        }
        // if dropForeignKeys is true, we just drop the table, otherwise we also drop table foreign keys.
        // createTable does not need separate method to create foreign keys, because it create fk's in the same query with table creation.
        if (dropForeignKeys)
            table.foreignKeys.forEach((foreignKey) => upQueries.push(this.dropForeignKeySql(table, foreignKey)));
        upQueries.push(this.dropTableSql(table));
        downQueries.push(this.createTableSql(table, createForeignKeys));
        // if table had columns with generated type, we must remove the expression from the metadata table
        const generatedColumns = table.columns.filter((column) => column.generatedType && column.asExpression);
        for (const column of generatedColumns) {
            const parsedTableName = this.driver.parseTableName(table);
            if (!parsedTableName.schema) {
                parsedTableName.schema = await this.getCurrentSchema();
            }
            const deleteQuery = this.deleteTypeormMetadataSql({
                database: parsedTableName.database,
                schema: parsedTableName.schema,
                table: parsedTableName.tableName,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
            });
            const insertQuery = this.insertTypeormMetadataSql({
                database: parsedTableName.database,
                schema: parsedTableName.schema,
                table: parsedTableName.tableName,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
                value: column.asExpression,
            });
            upQueries.push(deleteQuery);
            downQueries.push(insertQuery);
        }
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Creates a new view.
     */
    async createView(view, syncWithMetadata = false) {
        const upQueries = [];
        const downQueries = [];
        upQueries.push(this.createViewSql(view));
        if (syncWithMetadata)
            upQueries.push(await this.insertViewDefinitionSql(view));
        downQueries.push(this.dropViewSql(view));
        if (syncWithMetadata)
            downQueries.push(await this.deleteViewDefinitionSql(view));
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Drops the view.
     */
    async dropView(target) {
        const viewName = InstanceChecker.isView(target) ? target.name : target;
        const view = await this.getCachedView(viewName);
        const upQueries = [];
        const downQueries = [];
        upQueries.push(await this.deleteViewDefinitionSql(view));
        upQueries.push(this.dropViewSql(view));
        downQueries.push(await this.insertViewDefinitionSql(view));
        downQueries.push(this.createViewSql(view));
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Renames a table.
     */
    async renameTable(oldTableOrName, newTableName) {
        const upQueries = [];
        const downQueries = [];
        const oldTable = InstanceChecker.isTable(oldTableOrName)
            ? oldTableOrName
            : await this.getCachedTable(oldTableOrName);
        let newTable = oldTable.clone();
        // we need database name and schema name to rename FK constraints
        let dbName = undefined;
        let schemaName = undefined;
        let oldTableName = oldTable.name;
        const splittedName = oldTable.name.split(".");
        if (splittedName.length === 3) {
            dbName = splittedName[0];
            oldTableName = splittedName[2];
            if (splittedName[1] !== "")
                schemaName = splittedName[1];
        }
        else if (splittedName.length === 2) {
            schemaName = splittedName[0];
            oldTableName = splittedName[1];
        }
        newTable.name = this.driver.buildTableName(newTableName, schemaName, dbName);
        // if we have tables with database which differs from database specified in config, we must change currently used database.
        // This need because we can not rename objects from another database.
        const currentDB = await this.getCurrentDatabase();
        if (dbName && dbName !== currentDB) {
            upQueries.push(new Query(`USE "${dbName}"`));
            downQueries.push(new Query(`USE "${currentDB}"`));
        }
        // rename table
        upQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(oldTable)}", "${newTableName}"`));
        downQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(newTable)}", "${oldTableName}"`));
        // rename primary key constraint
        if (newTable.primaryColumns.length > 0 &&
            !newTable.primaryColumns[0].primaryKeyConstraintName) {
            const columnNames = newTable.primaryColumns.map((column) => column.name);
            const oldPkName = this.connection.namingStrategy.primaryKeyName(oldTable, columnNames);
            const newPkName = this.connection.namingStrategy.primaryKeyName(newTable, columnNames);
            // rename primary constraint
            upQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(newTable)}.${oldPkName}", "${newPkName}"`));
            downQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(newTable)}.${newPkName}", "${oldPkName}"`));
        }
        // rename unique constraints
        newTable.uniques.forEach((unique) => {
            const oldUniqueName = this.connection.namingStrategy.uniqueConstraintName(oldTable, unique.columnNames);
            // Skip renaming if Unique has user defined constraint name
            if (unique.name !== oldUniqueName)
                return;
            // build new constraint name
            const newUniqueName = this.connection.namingStrategy.uniqueConstraintName(newTable, unique.columnNames);
            // build queries
            upQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(newTable)}.${unique.name}", "${newUniqueName}"`));
            downQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(newTable)}.${newUniqueName}", "${unique.name}"`));
            // replace constraint name
            unique.name = newUniqueName;
        });
        // rename index constraints
        newTable.indices.forEach((index) => {
            const oldIndexName = this.connection.namingStrategy.indexName(oldTable, index.columnNames, index.where);
            // Skip renaming if Index has user defined constraint name
            if (index.name !== oldIndexName)
                return;
            // build new constraint name
            const newIndexName = this.connection.namingStrategy.indexName(newTable, index.columnNames, index.where);
            // build queries
            upQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(newTable)}.${index.name}", "${newIndexName}", "INDEX"`));
            downQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(newTable)}.${newIndexName}", "${index.name}", "INDEX"`));
            // replace constraint name
            index.name = newIndexName;
        });
        // rename foreign key constraints
        newTable.foreignKeys.forEach((foreignKey) => {
            const oldForeignKeyName = this.connection.namingStrategy.foreignKeyName(oldTable, foreignKey.columnNames, this.getTablePath(foreignKey), foreignKey.referencedColumnNames);
            // Skip renaming if foreign key has user defined constraint name
            if (foreignKey.name !== oldForeignKeyName)
                return;
            // build new constraint name
            const newForeignKeyName = this.connection.namingStrategy.foreignKeyName(newTable, foreignKey.columnNames, this.getTablePath(foreignKey), foreignKey.referencedColumnNames);
            // build queries
            upQueries.push(new Query(`EXEC sp_rename "${this.buildForeignKeyName(foreignKey.name, schemaName, dbName)}", "${newForeignKeyName}"`));
            downQueries.push(new Query(`EXEC sp_rename "${this.buildForeignKeyName(newForeignKeyName, schemaName, dbName)}", "${foreignKey.name}"`));
            // replace constraint name
            foreignKey.name = newForeignKeyName;
        });
        // change currently used database back to default db.
        if (dbName && dbName !== currentDB) {
            upQueries.push(new Query(`USE "${currentDB}"`));
            downQueries.push(new Query(`USE "${dbName}"`));
        }
        await this.executeQueries(upQueries, downQueries);
        // rename old table and replace it in cached tabled;
        oldTable.name = newTable.name;
        this.replaceCachedTable(oldTable, newTable);
    }
    /**
     * Creates a new column from the column in the table.
     */
    async addColumn(tableOrName, column) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const clonedTable = table.clone();
        const upQueries = [];
        const downQueries = [];
        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD ${this.buildCreateColumnSql(table, column, false, true)}`));
        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP COLUMN "${column.name}"`));
        // create or update primary key constraint
        if (column.isPrimary) {
            const primaryColumns = clonedTable.primaryColumns;
            // if table already have primary key, me must drop it and recreate again
            if (primaryColumns.length > 0) {
                const pkName = primaryColumns[0].primaryKeyConstraintName
                    ? primaryColumns[0].primaryKeyConstraintName
                    : this.connection.namingStrategy.primaryKeyName(clonedTable, primaryColumns.map((column) => column.name));
                const columnNames = primaryColumns
                    .map((column) => `"${column.name}"`)
                    .join(", ");
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${pkName}"`));
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNames})`));
            }
            primaryColumns.push(column);
            const pkName = primaryColumns[0].primaryKeyConstraintName
                ? primaryColumns[0].primaryKeyConstraintName
                : this.connection.namingStrategy.primaryKeyName(clonedTable, primaryColumns.map((column) => column.name));
            const columnNames = primaryColumns
                .map((column) => `"${column.name}"`)
                .join(", ");
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNames})`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${pkName}"`));
        }
        // create column index
        const columnIndex = clonedTable.indices.find((index) => index.columnNames.length === 1 &&
            index.columnNames[0] === column.name);
        if (columnIndex) {
            upQueries.push(this.createIndexSql(table, columnIndex));
            downQueries.push(this.dropIndexSql(table, columnIndex));
        }
        // create unique constraint
        if (column.isUnique) {
            const uniqueConstraint = new TableUnique({
                name: this.connection.namingStrategy.uniqueConstraintName(table, [column.name]),
                columnNames: [column.name],
            });
            clonedTable.uniques.push(uniqueConstraint);
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${uniqueConstraint.name}" UNIQUE ("${column.name}")`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${uniqueConstraint.name}"`));
        }
        // remove default constraint
        if (column.default !== null && column.default !== undefined) {
            const defaultName = this.connection.namingStrategy.defaultConstraintName(table, column.name);
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${defaultName}"`));
        }
        if (column.generatedType && column.asExpression) {
            const parsedTableName = this.driver.parseTableName(table);
            if (!parsedTableName.schema) {
                parsedTableName.schema = await this.getCurrentSchema();
            }
            const insertQuery = this.insertTypeormMetadataSql({
                database: parsedTableName.database,
                schema: parsedTableName.schema,
                table: parsedTableName.tableName,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
                value: column.asExpression,
            });
            const deleteQuery = this.deleteTypeormMetadataSql({
                database: parsedTableName.database,
                schema: parsedTableName.schema,
                table: parsedTableName.tableName,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
            });
            upQueries.push(insertQuery);
            downQueries.push(deleteQuery);
        }
        await this.executeQueries(upQueries, downQueries);
        clonedTable.addColumn(column);
        this.replaceCachedTable(table, clonedTable);
    }
    /**
     * Creates a new columns from the column in the table.
     */
    async addColumns(tableOrName, columns) {
        for (const column of columns) {
            await this.addColumn(tableOrName, column);
        }
    }
    /**
     * Renames column in the given table.
     */
    async renameColumn(tableOrName, oldTableColumnOrName, newTableColumnOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const oldColumn = InstanceChecker.isTableColumn(oldTableColumnOrName)
            ? oldTableColumnOrName
            : table.columns.find((c) => c.name === oldTableColumnOrName);
        if (!oldColumn)
            throw new TypeORMError(`Column "${oldTableColumnOrName}" was not found in the "${table.name}" table.`);
        let newColumn = undefined;
        if (InstanceChecker.isTableColumn(newTableColumnOrName)) {
            newColumn = newTableColumnOrName;
        }
        else {
            newColumn = oldColumn.clone();
            newColumn.name = newTableColumnOrName;
        }
        await this.changeColumn(table, oldColumn, newColumn);
    }
    /**
     * Changes a column in the table.
     */
    async changeColumn(tableOrName, oldTableColumnOrName, newColumn) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        let clonedTable = table.clone();
        const upQueries = [];
        const downQueries = [];
        const oldColumn = InstanceChecker.isTableColumn(oldTableColumnOrName)
            ? oldTableColumnOrName
            : table.columns.find((column) => column.name === oldTableColumnOrName);
        if (!oldColumn)
            throw new TypeORMError(`Column "${oldTableColumnOrName}" was not found in the "${table.name}" table.`);
        if ((newColumn.isGenerated !== oldColumn.isGenerated &&
            newColumn.generationStrategy !== "uuid") ||
            newColumn.type !== oldColumn.type ||
            newColumn.length !== oldColumn.length ||
            newColumn.asExpression !== oldColumn.asExpression ||
            newColumn.generatedType !== oldColumn.generatedType) {
            // SQL Server does not support changing of IDENTITY column, so we must drop column and recreate it again.
            // Also, we recreate column if column type changed
            await this.dropColumn(table, oldColumn);
            await this.addColumn(table, newColumn);
            // update cloned table
            clonedTable = table.clone();
        }
        else {
            if (newColumn.name !== oldColumn.name) {
                // we need database name and schema name to rename FK constraints
                let dbName = undefined;
                let schemaName = undefined;
                const splittedName = table.name.split(".");
                if (splittedName.length === 3) {
                    dbName = splittedName[0];
                    if (splittedName[1] !== "")
                        schemaName = splittedName[1];
                }
                else if (splittedName.length === 2) {
                    schemaName = splittedName[0];
                }
                // if we have tables with database which differs from database specified in config, we must change currently used database.
                // This need because we can not rename objects from another database.
                const currentDB = await this.getCurrentDatabase();
                if (dbName && dbName !== currentDB) {
                    upQueries.push(new Query(`USE "${dbName}"`));
                    downQueries.push(new Query(`USE "${currentDB}"`));
                }
                // rename the column
                upQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(table)}.${oldColumn.name}", "${newColumn.name}"`));
                downQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(table)}.${newColumn.name}", "${oldColumn.name}"`));
                // rename column primary key constraint
                if (oldColumn.isPrimary === true &&
                    !oldColumn.primaryKeyConstraintName) {
                    const primaryColumns = clonedTable.primaryColumns;
                    // build old primary constraint name
                    const columnNames = primaryColumns.map((column) => column.name);
                    const oldPkName = this.connection.namingStrategy.primaryKeyName(clonedTable, columnNames);
                    // replace old column name with new column name
                    columnNames.splice(columnNames.indexOf(oldColumn.name), 1);
                    columnNames.push(newColumn.name);
                    // build new primary constraint name
                    const newPkName = this.connection.namingStrategy.primaryKeyName(clonedTable, columnNames);
                    // rename primary constraint
                    upQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(clonedTable)}.${oldPkName}", "${newPkName}"`));
                    downQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(clonedTable)}.${newPkName}", "${oldPkName}"`));
                }
                // rename index constraints
                clonedTable.findColumnIndices(oldColumn).forEach((index) => {
                    const oldIndexName = this.connection.namingStrategy.indexName(clonedTable, index.columnNames, index.where);
                    // Skip renaming if Index has user defined constraint name
                    if (index.name !== oldIndexName)
                        return;
                    // build new constraint name
                    index.columnNames.splice(index.columnNames.indexOf(oldColumn.name), 1);
                    index.columnNames.push(newColumn.name);
                    const newIndexName = this.connection.namingStrategy.indexName(clonedTable, index.columnNames, index.where);
                    // build queries
                    upQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(clonedTable)}.${index.name}", "${newIndexName}", "INDEX"`));
                    downQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(clonedTable)}.${newIndexName}", "${index.name}", "INDEX"`));
                    // replace constraint name
                    index.name = newIndexName;
                });
                // rename foreign key constraints
                clonedTable
                    .findColumnForeignKeys(oldColumn)
                    .forEach((foreignKey) => {
                    const foreignKeyName = this.connection.namingStrategy.foreignKeyName(clonedTable, foreignKey.columnNames, this.getTablePath(foreignKey), foreignKey.referencedColumnNames);
                    // Skip renaming if foreign key has user defined constraint name
                    if (foreignKey.name !== foreignKeyName)
                        return;
                    // build new constraint name
                    foreignKey.columnNames.splice(foreignKey.columnNames.indexOf(oldColumn.name), 1);
                    foreignKey.columnNames.push(newColumn.name);
                    const newForeignKeyName = this.connection.namingStrategy.foreignKeyName(clonedTable, foreignKey.columnNames, this.getTablePath(foreignKey), foreignKey.referencedColumnNames);
                    // build queries
                    upQueries.push(new Query(`EXEC sp_rename "${this.buildForeignKeyName(foreignKey.name, schemaName, dbName)}", "${newForeignKeyName}"`));
                    downQueries.push(new Query(`EXEC sp_rename "${this.buildForeignKeyName(newForeignKeyName, schemaName, dbName)}", "${foreignKey.name}"`));
                    // replace constraint name
                    foreignKey.name = newForeignKeyName;
                });
                // rename check constraints
                clonedTable.findColumnChecks(oldColumn).forEach((check) => {
                    // build new constraint name
                    check.columnNames.splice(check.columnNames.indexOf(oldColumn.name), 1);
                    check.columnNames.push(newColumn.name);
                    const newCheckName = this.connection.namingStrategy.checkConstraintName(clonedTable, check.expression);
                    // build queries
                    upQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(clonedTable)}.${check.name}", "${newCheckName}"`));
                    downQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(clonedTable)}.${newCheckName}", "${check.name}"`));
                    // replace constraint name
                    check.name = newCheckName;
                });
                // rename unique constraints
                clonedTable.findColumnUniques(oldColumn).forEach((unique) => {
                    const oldUniqueName = this.connection.namingStrategy.uniqueConstraintName(clonedTable, unique.columnNames);
                    // Skip renaming if Unique has user defined constraint name
                    if (unique.name !== oldUniqueName)
                        return;
                    // build new constraint name
                    unique.columnNames.splice(unique.columnNames.indexOf(oldColumn.name), 1);
                    unique.columnNames.push(newColumn.name);
                    const newUniqueName = this.connection.namingStrategy.uniqueConstraintName(clonedTable, unique.columnNames);
                    // build queries
                    upQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(clonedTable)}.${unique.name}", "${newUniqueName}"`));
                    downQueries.push(new Query(`EXEC sp_rename "${this.getTablePath(clonedTable)}.${newUniqueName}", "${unique.name}"`));
                    // replace constraint name
                    unique.name = newUniqueName;
                });
                // rename default constraints
                if (oldColumn.default !== null &&
                    oldColumn.default !== undefined) {
                    const oldDefaultName = this.connection.namingStrategy.defaultConstraintName(table, oldColumn.name);
                    const newDefaultName = this.connection.namingStrategy.defaultConstraintName(table, newColumn.name);
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${oldDefaultName}"`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${oldDefaultName}" DEFAULT ${oldColumn.default} FOR "${newColumn.name}"`));
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${newDefaultName}" DEFAULT ${oldColumn.default} FOR "${newColumn.name}"`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${newDefaultName}"`));
                }
                // change currently used database back to default db.
                if (dbName && dbName !== currentDB) {
                    upQueries.push(new Query(`USE "${currentDB}"`));
                    downQueries.push(new Query(`USE "${dbName}"`));
                }
                // rename old column in the Table object
                const oldTableColumn = clonedTable.columns.find((column) => column.name === oldColumn.name);
                clonedTable.columns[clonedTable.columns.indexOf(oldTableColumn)].name = newColumn.name;
                oldColumn.name = newColumn.name;
            }
            if (this.isColumnChanged(oldColumn, newColumn, false)) {
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN ${this.buildCreateColumnSql(table, newColumn, true, false)}`));
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ALTER COLUMN ${this.buildCreateColumnSql(table, oldColumn, true, false)}`));
            }
            if (newColumn.isPrimary !== oldColumn.isPrimary) {
                const primaryColumns = clonedTable.primaryColumns;
                // if primary column state changed, we must always drop existed constraint.
                if (primaryColumns.length > 0) {
                    const pkName = primaryColumns[0].primaryKeyConstraintName
                        ? primaryColumns[0].primaryKeyConstraintName
                        : this.connection.namingStrategy.primaryKeyName(clonedTable, primaryColumns.map((column) => column.name));
                    const columnNames = primaryColumns
                        .map((column) => `"${column.name}"`)
                        .join(", ");
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${pkName}"`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNames})`));
                }
                if (newColumn.isPrimary === true) {
                    primaryColumns.push(newColumn);
                    // update column in table
                    const column = clonedTable.columns.find((column) => column.name === newColumn.name);
                    column.isPrimary = true;
                    const pkName = primaryColumns[0].primaryKeyConstraintName
                        ? primaryColumns[0].primaryKeyConstraintName
                        : this.connection.namingStrategy.primaryKeyName(clonedTable, primaryColumns.map((column) => column.name));
                    const columnNames = primaryColumns
                        .map((column) => `"${column.name}"`)
                        .join(", ");
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNames})`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${pkName}"`));
                }
                else {
                    const primaryColumn = primaryColumns.find((c) => c.name === newColumn.name);
                    primaryColumns.splice(primaryColumns.indexOf(primaryColumn), 1);
                    // update column in table
                    const column = clonedTable.columns.find((column) => column.name === newColumn.name);
                    column.isPrimary = false;
                    // if we have another primary keys, we must recreate constraint.
                    if (primaryColumns.length > 0) {
                        const pkName = primaryColumns[0]
                            .primaryKeyConstraintName
                            ? primaryColumns[0].primaryKeyConstraintName
                            : this.connection.namingStrategy.primaryKeyName(clonedTable, primaryColumns.map((column) => column.name));
                        const columnNames = primaryColumns
                            .map((column) => `"${column.name}"`)
                            .join(", ");
                        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNames})`));
                        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${pkName}"`));
                    }
                }
            }
            if (newColumn.isUnique !== oldColumn.isUnique) {
                if (newColumn.isUnique === true) {
                    const uniqueConstraint = new TableUnique({
                        name: this.connection.namingStrategy.uniqueConstraintName(table, [newColumn.name]),
                        columnNames: [newColumn.name],
                    });
                    clonedTable.uniques.push(uniqueConstraint);
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${uniqueConstraint.name}" UNIQUE ("${newColumn.name}")`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${uniqueConstraint.name}"`));
                }
                else {
                    const uniqueConstraint = clonedTable.uniques.find((unique) => {
                        return (unique.columnNames.length === 1 &&
                            !!unique.columnNames.find((columnName) => columnName === newColumn.name));
                    });
                    clonedTable.uniques.splice(clonedTable.uniques.indexOf(uniqueConstraint), 1);
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${uniqueConstraint.name}"`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${uniqueConstraint.name}" UNIQUE ("${newColumn.name}")`));
                }
            }
            if (newColumn.default !== oldColumn.default) {
                // (note) if there is a previous default, we need to drop its constraint first
                if (oldColumn.default !== null &&
                    oldColumn.default !== undefined) {
                    const defaultName = this.connection.namingStrategy.defaultConstraintName(table, oldColumn.name);
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${defaultName}"`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${defaultName}" DEFAULT ${oldColumn.default} FOR "${oldColumn.name}"`));
                }
                if (newColumn.default !== null &&
                    newColumn.default !== undefined) {
                    const defaultName = this.connection.namingStrategy.defaultConstraintName(table, newColumn.name);
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${defaultName}" DEFAULT ${newColumn.default} FOR "${newColumn.name}"`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${defaultName}"`));
                }
            }
            await this.executeQueries(upQueries, downQueries);
            this.replaceCachedTable(table, clonedTable);
        }
    }
    /**
     * Changes a column in the table.
     */
    async changeColumns(tableOrName, changedColumns) {
        for (const { oldColumn, newColumn } of changedColumns) {
            await this.changeColumn(tableOrName, oldColumn, newColumn);
        }
    }
    /**
     * Drops column in the table.
     */
    async dropColumn(tableOrName, columnOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const column = InstanceChecker.isTableColumn(columnOrName)
            ? columnOrName
            : table.findColumnByName(columnOrName);
        if (!column)
            throw new TypeORMError(`Column "${columnOrName}" was not found in table "${table.name}"`);
        const clonedTable = table.clone();
        const upQueries = [];
        const downQueries = [];
        // drop primary key constraint
        if (column.isPrimary) {
            const pkName = column.primaryKeyConstraintName
                ? column.primaryKeyConstraintName
                : this.connection.namingStrategy.primaryKeyName(clonedTable, clonedTable.primaryColumns.map((column) => column.name));
            const columnNames = clonedTable.primaryColumns
                .map((primaryColumn) => `"${primaryColumn.name}"`)
                .join(", ");
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(clonedTable)} DROP CONSTRAINT "${pkName}"`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(clonedTable)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNames})`));
            // update column in table
            const tableColumn = clonedTable.findColumnByName(column.name);
            tableColumn.isPrimary = false;
            // if primary key have multiple columns, we must recreate it without dropped column
            if (clonedTable.primaryColumns.length > 0) {
                const pkName = clonedTable.primaryColumns[0]
                    .primaryKeyConstraintName
                    ? clonedTable.primaryColumns[0].primaryKeyConstraintName
                    : this.connection.namingStrategy.primaryKeyName(clonedTable, clonedTable.primaryColumns.map((column) => column.name));
                const columnNames = clonedTable.primaryColumns
                    .map((primaryColumn) => `"${primaryColumn.name}"`)
                    .join(", ");
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(clonedTable)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNames})`));
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(clonedTable)} DROP CONSTRAINT "${pkName}"`));
            }
        }
        // drop column index
        const columnIndex = clonedTable.indices.find((index) => index.columnNames.length === 1 &&
            index.columnNames[0] === column.name);
        if (columnIndex) {
            clonedTable.indices.splice(clonedTable.indices.indexOf(columnIndex), 1);
            upQueries.push(this.dropIndexSql(table, columnIndex));
            downQueries.push(this.createIndexSql(table, columnIndex));
        }
        // drop column check
        const columnCheck = clonedTable.checks.find((check) => !!check.columnNames &&
            check.columnNames.length === 1 &&
            check.columnNames[0] === column.name);
        if (columnCheck) {
            clonedTable.checks.splice(clonedTable.checks.indexOf(columnCheck), 1);
            upQueries.push(this.dropCheckConstraintSql(table, columnCheck));
            downQueries.push(this.createCheckConstraintSql(table, columnCheck));
        }
        // drop column unique
        const columnUnique = clonedTable.uniques.find((unique) => unique.columnNames.length === 1 &&
            unique.columnNames[0] === column.name);
        if (columnUnique) {
            clonedTable.uniques.splice(clonedTable.uniques.indexOf(columnUnique), 1);
            upQueries.push(this.dropUniqueConstraintSql(table, columnUnique));
            downQueries.push(this.createUniqueConstraintSql(table, columnUnique));
        }
        // drop default constraint
        if (column.default !== null && column.default !== undefined) {
            const defaultName = this.connection.namingStrategy.defaultConstraintName(table, column.name);
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${defaultName}"`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${defaultName}" DEFAULT ${column.default} FOR "${column.name}"`));
        }
        if (column.generatedType && column.asExpression) {
            const parsedTableName = this.driver.parseTableName(table);
            if (!parsedTableName.schema) {
                parsedTableName.schema = await this.getCurrentSchema();
            }
            const deleteQuery = this.deleteTypeormMetadataSql({
                database: parsedTableName.database,
                schema: parsedTableName.schema,
                table: parsedTableName.tableName,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
            });
            const insertQuery = this.insertTypeormMetadataSql({
                database: parsedTableName.database,
                schema: parsedTableName.schema,
                table: parsedTableName.tableName,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
                value: column.asExpression,
            });
            upQueries.push(deleteQuery);
            downQueries.push(insertQuery);
        }
        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP COLUMN "${column.name}"`));
        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD ${this.buildCreateColumnSql(table, column, false, false)}`));
        await this.executeQueries(upQueries, downQueries);
        clonedTable.removeColumn(column);
        this.replaceCachedTable(table, clonedTable);
    }
    /**
     * Drops the columns in the table.
     */
    async dropColumns(tableOrName, columns) {
        for (const column of columns) {
            await this.dropColumn(tableOrName, column);
        }
    }
    /**
     * Creates a new primary key.
     */
    async createPrimaryKey(tableOrName, columnNames, constraintName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const clonedTable = table.clone();
        const up = this.createPrimaryKeySql(table, columnNames, constraintName);
        // mark columns as primary, because dropPrimaryKeySql build constraint name from table primary column names.
        clonedTable.columns.forEach((column) => {
            if (columnNames.find((columnName) => columnName === column.name))
                column.isPrimary = true;
        });
        const down = this.dropPrimaryKeySql(clonedTable);
        await this.executeQueries(up, down);
        this.replaceCachedTable(table, clonedTable);
    }
    /**
     * Updates composite primary keys.
     */
    async updatePrimaryKeys(tableOrName, columns) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const clonedTable = table.clone();
        const columnNames = columns.map((column) => column.name);
        const upQueries = [];
        const downQueries = [];
        // if table already have primary columns, we must drop them.
        const primaryColumns = clonedTable.primaryColumns;
        if (primaryColumns.length > 0) {
            const pkName = primaryColumns[0].primaryKeyConstraintName
                ? primaryColumns[0].primaryKeyConstraintName
                : this.connection.namingStrategy.primaryKeyName(clonedTable, primaryColumns.map((column) => column.name));
            const columnNamesString = primaryColumns
                .map((column) => `"${column.name}"`)
                .join(", ");
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${pkName}"`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNamesString})`));
        }
        // update columns in table.
        clonedTable.columns
            .filter((column) => columnNames.indexOf(column.name) !== -1)
            .forEach((column) => (column.isPrimary = true));
        const pkName = primaryColumns[0].primaryKeyConstraintName
            ? primaryColumns[0].primaryKeyConstraintName
            : this.connection.namingStrategy.primaryKeyName(clonedTable, columnNames);
        const columnNamesString = columnNames
            .map((columnName) => `"${columnName}"`)
            .join(", ");
        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${pkName}" PRIMARY KEY (${columnNamesString})`));
        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${pkName}"`));
        await this.executeQueries(upQueries, downQueries);
        this.replaceCachedTable(table, clonedTable);
    }
    /**
     * Drops a primary key.
     */
    async dropPrimaryKey(tableOrName, constraintName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const up = this.dropPrimaryKeySql(table);
        const down = this.createPrimaryKeySql(table, table.primaryColumns.map((column) => column.name), constraintName);
        await this.executeQueries(up, down);
        table.primaryColumns.forEach((column) => {
            column.isPrimary = false;
        });
    }
    /**
     * Creates a new unique constraint.
     */
    async createUniqueConstraint(tableOrName, uniqueConstraint) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // new unique constraint may be passed without name. In this case we generate unique name manually.
        if (!uniqueConstraint.name)
            uniqueConstraint.name =
                this.connection.namingStrategy.uniqueConstraintName(table, uniqueConstraint.columnNames);
        const up = this.createUniqueConstraintSql(table, uniqueConstraint);
        const down = this.dropUniqueConstraintSql(table, uniqueConstraint);
        await this.executeQueries(up, down);
        table.addUniqueConstraint(uniqueConstraint);
    }
    /**
     * Creates a new unique constraints.
     */
    async createUniqueConstraints(tableOrName, uniqueConstraints) {
        const promises = uniqueConstraints.map((uniqueConstraint) => this.createUniqueConstraint(tableOrName, uniqueConstraint));
        await Promise.all(promises);
    }
    /**
     * Drops unique constraint.
     */
    async dropUniqueConstraint(tableOrName, uniqueOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const uniqueConstraint = InstanceChecker.isTableUnique(uniqueOrName)
            ? uniqueOrName
            : table.uniques.find((u) => u.name === uniqueOrName);
        if (!uniqueConstraint)
            throw new TypeORMError(`Supplied unique constraint was not found in table ${table.name}`);
        const up = this.dropUniqueConstraintSql(table, uniqueConstraint);
        const down = this.createUniqueConstraintSql(table, uniqueConstraint);
        await this.executeQueries(up, down);
        table.removeUniqueConstraint(uniqueConstraint);
    }
    /**
     * Drops an unique constraints.
     */
    async dropUniqueConstraints(tableOrName, uniqueConstraints) {
        const promises = uniqueConstraints.map((uniqueConstraint) => this.dropUniqueConstraint(tableOrName, uniqueConstraint));
        await Promise.all(promises);
    }
    /**
     * Creates a new check constraint.
     */
    async createCheckConstraint(tableOrName, checkConstraint) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // new unique constraint may be passed without name. In this case we generate unique name manually.
        if (!checkConstraint.name)
            checkConstraint.name =
                this.connection.namingStrategy.checkConstraintName(table, checkConstraint.expression);
        const up = this.createCheckConstraintSql(table, checkConstraint);
        const down = this.dropCheckConstraintSql(table, checkConstraint);
        await this.executeQueries(up, down);
        table.addCheckConstraint(checkConstraint);
    }
    /**
     * Creates a new check constraints.
     */
    async createCheckConstraints(tableOrName, checkConstraints) {
        const promises = checkConstraints.map((checkConstraint) => this.createCheckConstraint(tableOrName, checkConstraint));
        await Promise.all(promises);
    }
    /**
     * Drops check constraint.
     */
    async dropCheckConstraint(tableOrName, checkOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const checkConstraint = InstanceChecker.isTableCheck(checkOrName)
            ? checkOrName
            : table.checks.find((c) => c.name === checkOrName);
        if (!checkConstraint)
            throw new TypeORMError(`Supplied check constraint was not found in table ${table.name}`);
        const up = this.dropCheckConstraintSql(table, checkConstraint);
        const down = this.createCheckConstraintSql(table, checkConstraint);
        await this.executeQueries(up, down);
        table.removeCheckConstraint(checkConstraint);
    }
    /**
     * Drops check constraints.
     */
    async dropCheckConstraints(tableOrName, checkConstraints) {
        const promises = checkConstraints.map((checkConstraint) => this.dropCheckConstraint(tableOrName, checkConstraint));
        await Promise.all(promises);
    }
    /**
     * Creates a new exclusion constraint.
     */
    async createExclusionConstraint(tableOrName, exclusionConstraint) {
        throw new TypeORMError(`SqlServer does not support exclusion constraints.`);
    }
    /**
     * Creates a new exclusion constraints.
     */
    async createExclusionConstraints(tableOrName, exclusionConstraints) {
        throw new TypeORMError(`SqlServer does not support exclusion constraints.`);
    }
    /**
     * Drops exclusion constraint.
     */
    async dropExclusionConstraint(tableOrName, exclusionOrName) {
        throw new TypeORMError(`SqlServer does not support exclusion constraints.`);
    }
    /**
     * Drops exclusion constraints.
     */
    async dropExclusionConstraints(tableOrName, exclusionConstraints) {
        throw new TypeORMError(`SqlServer does not support exclusion constraints.`);
    }
    /**
     * Creates a new foreign key.
     */
    async createForeignKey(tableOrName, foreignKey) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const metadata = this.connection.hasMetadata(table.name)
            ? this.connection.getMetadata(table.name)
            : undefined;
        if (metadata &&
            metadata.treeParentRelation &&
            metadata.treeParentRelation.isTreeParent &&
            metadata.foreignKeys.find((foreignKey) => foreignKey.onDelete !== "NO ACTION"))
            throw new TypeORMError("SqlServer does not support options in TreeParent.");
        // new FK may be passed without name. In this case we generate FK name manually.
        if (!foreignKey.name)
            foreignKey.name = this.connection.namingStrategy.foreignKeyName(table, foreignKey.columnNames, this.getTablePath(foreignKey), foreignKey.referencedColumnNames);
        const up = this.createForeignKeySql(table, foreignKey);
        const down = this.dropForeignKeySql(table, foreignKey);
        await this.executeQueries(up, down);
        table.addForeignKey(foreignKey);
    }
    /**
     * Creates a new foreign keys.
     */
    async createForeignKeys(tableOrName, foreignKeys) {
        const promises = foreignKeys.map((foreignKey) => this.createForeignKey(tableOrName, foreignKey));
        await Promise.all(promises);
    }
    /**
     * Drops a foreign key from the table.
     */
    async dropForeignKey(tableOrName, foreignKeyOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const foreignKey = InstanceChecker.isTableForeignKey(foreignKeyOrName)
            ? foreignKeyOrName
            : table.foreignKeys.find((fk) => fk.name === foreignKeyOrName);
        if (!foreignKey)
            throw new TypeORMError(`Supplied foreign key was not found in table ${table.name}`);
        const up = this.dropForeignKeySql(table, foreignKey);
        const down = this.createForeignKeySql(table, foreignKey);
        await this.executeQueries(up, down);
        table.removeForeignKey(foreignKey);
    }
    /**
     * Drops a foreign keys from the table.
     */
    async dropForeignKeys(tableOrName, foreignKeys) {
        const promises = foreignKeys.map((foreignKey) => this.dropForeignKey(tableOrName, foreignKey));
        await Promise.all(promises);
    }
    /**
     * Creates a new index.
     */
    async createIndex(tableOrName, index) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // new index may be passed without name. In this case we generate index name manually.
        if (!index.name)
            index.name = this.generateIndexName(table, index);
        const up = this.createIndexSql(table, index);
        const down = this.dropIndexSql(table, index);
        await this.executeQueries(up, down);
        table.addIndex(index);
    }
    /**
     * Creates a new indices
     */
    async createIndices(tableOrName, indices) {
        const promises = indices.map((index) => this.createIndex(tableOrName, index));
        await Promise.all(promises);
    }
    /**
     * Drops an index.
     */
    async dropIndex(tableOrName, indexOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const index = InstanceChecker.isTableIndex(indexOrName)
            ? indexOrName
            : table.indices.find((i) => i.name === indexOrName);
        if (!index)
            throw new TypeORMError(`Supplied index was not found in table ${table.name}`);
        // old index may be passed without name. In this case we generate index name manually.
        if (!index.name)
            index.name = this.generateIndexName(table, index);
        const up = this.dropIndexSql(table, index);
        const down = this.createIndexSql(table, index);
        await this.executeQueries(up, down);
        table.removeIndex(index);
    }
    /**
     * Drops an indices from the table.
     */
    async dropIndices(tableOrName, indices) {
        const promises = indices.map((index) => this.dropIndex(tableOrName, index));
        await Promise.all(promises);
    }
    /**
     * Clears all table contents.
     * Note: this operation uses SQL's TRUNCATE query which cannot be reverted in transactions.
     */
    async clearTable(tablePath) {
        await this.query(`TRUNCATE TABLE ${this.escapePath(tablePath)}`);
    }
    /**
     * Removes all tables from the currently connected database.
     */
    async clearDatabase(database) {
        if (database) {
            const isDatabaseExist = await this.hasDatabase(database);
            if (!isDatabaseExist)
                return Promise.resolve();
        }
        const isAnotherTransactionActive = this.isTransactionActive;
        if (!isAnotherTransactionActive)
            await this.startTransaction();
        try {
            let allViewsSql = database
                ? `SELECT * FROM "${database}"."INFORMATION_SCHEMA"."VIEWS"`
                : `SELECT * FROM "INFORMATION_SCHEMA"."VIEWS"`;
            const allViewsResults = await this.query(allViewsSql);
            await Promise.all(allViewsResults.map((viewResult) => {
                // 'DROP VIEW' does not allow specifying the database name as a prefix to the object name.
                const dropTableSql = `DROP VIEW "${viewResult["TABLE_SCHEMA"]}"."${viewResult["TABLE_NAME"]}"`;
                return this.query(dropTableSql);
            }));
            let allTablesSql = database
                ? `SELECT * FROM "${database}"."INFORMATION_SCHEMA"."TABLES" WHERE "TABLE_TYPE" = 'BASE TABLE'`
                : `SELECT * FROM "INFORMATION_SCHEMA"."TABLES" WHERE "TABLE_TYPE" = 'BASE TABLE'`;
            const allTablesResults = await this.query(allTablesSql);
            if (allTablesResults.length > 0) {
                const tablesByCatalog = allTablesResults.reduce((c, { TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME }) => {
                    c[TABLE_CATALOG] = c[TABLE_CATALOG] || [];
                    c[TABLE_CATALOG].push({ TABLE_SCHEMA, TABLE_NAME });
                    return c;
                }, {});
                const foreignKeysSql = Object.entries(tablesByCatalog)
                    .map(([TABLE_CATALOG, tables]) => {
                    const conditions = tables
                        .map(({ TABLE_SCHEMA, TABLE_NAME }) => {
                        return `("fk"."referenced_object_id" = OBJECT_ID('"${TABLE_CATALOG}"."${TABLE_SCHEMA}"."${TABLE_NAME}"'))`;
                    })
                        .join(" OR ");
                    return `
                        SELECT DISTINCT '${TABLE_CATALOG}' AS                                              "TABLE_CATALOG",
                                        OBJECT_SCHEMA_NAME("fk"."parent_object_id",
                                                           DB_ID('${TABLE_CATALOG}')) AS                   "TABLE_SCHEMA",
                                        OBJECT_NAME("fk"."parent_object_id", DB_ID('${TABLE_CATALOG}')) AS "TABLE_NAME",
                                        "fk"."name" AS                                                     "CONSTRAINT_NAME"
                        FROM "${TABLE_CATALOG}"."sys"."foreign_keys" AS "fk"
                        WHERE (${conditions})
                    `;
                })
                    .join(" UNION ALL ");
                const foreignKeys = await this.query(foreignKeysSql);
                await Promise.all(foreignKeys.map(async ({ TABLE_CATALOG, TABLE_SCHEMA, TABLE_NAME, CONSTRAINT_NAME, }) => {
                    // Disable the constraint first.
                    await this.query(`ALTER TABLE "${TABLE_CATALOG}"."${TABLE_SCHEMA}"."${TABLE_NAME}" ` +
                        `NOCHECK CONSTRAINT "${CONSTRAINT_NAME}"`);
                    await this.query(`ALTER TABLE "${TABLE_CATALOG}"."${TABLE_SCHEMA}"."${TABLE_NAME}" ` +
                        `DROP CONSTRAINT "${CONSTRAINT_NAME}" -- FROM CLEAR`);
                }));
                await Promise.all(allTablesResults.map((tablesResult) => {
                    if (tablesResult["TABLE_NAME"].startsWith("#")) {
                        // don't try to drop temporary tables
                        return;
                    }
                    const dropTableSql = `DROP TABLE "${tablesResult["TABLE_CATALOG"]}"."${tablesResult["TABLE_SCHEMA"]}"."${tablesResult["TABLE_NAME"]}"`;
                    return this.query(dropTableSql);
                }));
            }
            if (!isAnotherTransactionActive)
                await this.commitTransaction();
        }
        catch (error) {
            try {
                // we throw original error even if rollback thrown an error
                if (!isAnotherTransactionActive)
                    await this.rollbackTransaction();
            }
            catch (rollbackError) { }
            throw error;
        }
    }
    // -------------------------------------------------------------------------
    // Protected Methods
    // -------------------------------------------------------------------------
    async loadViews(viewPaths) {
        const hasTable = await this.hasTable(this.getTypeormMetadataTableName());
        if (!hasTable) {
            return [];
        }
        if (!viewPaths) {
            viewPaths = [];
        }
        const currentSchema = await this.getCurrentSchema();
        const currentDatabase = await this.getCurrentDatabase();
        const dbNames = viewPaths
            .map((viewPath) => this.driver.parseTableName(viewPath).database)
            .filter((database) => database);
        if (this.driver.database &&
            !dbNames.find((dbName) => dbName === this.driver.database))
            dbNames.push(this.driver.database);
        const viewsCondition = viewPaths
            .map((viewPath) => {
            let { schema, tableName: name } = this.driver.parseTableName(viewPath);
            if (!schema) {
                schema = currentSchema;
            }
            return `("T"."SCHEMA" = '${schema}' AND "T"."NAME" = '${name}')`;
        })
            .join(" OR ");
        const query = dbNames
            .map((dbName) => {
            return (`SELECT "T".*, "V"."CHECK_OPTION" FROM ${this.escapePath(this.getTypeormMetadataTableName())} "t" ` +
                `INNER JOIN "${dbName}"."INFORMATION_SCHEMA"."VIEWS" "V" ON "V"."TABLE_SCHEMA" = "T"."SCHEMA" AND "v"."TABLE_NAME" = "T"."NAME" WHERE "T"."TYPE" = '${MetadataTableType.VIEW}' ${viewsCondition ? `AND (${viewsCondition})` : ""}`);
        })
            .join(" UNION ALL ");
        const dbViews = await this.query(query);
        return dbViews.map((dbView) => {
            const view = new View();
            const db = dbView["TABLE_CATALOG"] === currentDatabase
                ? undefined
                : dbView["TABLE_CATALOG"];
            const schema = dbView["schema"] === currentSchema &&
                !this.driver.options.schema
                ? undefined
                : dbView["schema"];
            view.database = dbView["TABLE_CATALOG"];
            view.schema = dbView["schema"];
            view.name = this.driver.buildTableName(dbView["name"], schema, db);
            view.expression = dbView["value"];
            return view;
        });
    }
    /**
     * Loads all tables (with given names) from the database and creates a Table from them.
     */
    async loadTables(tableNames) {
        // if no tables given then no need to proceed
        if (tableNames && tableNames.length === 0) {
            return [];
        }
        const currentSchema = await this.getCurrentSchema();
        const currentDatabase = await this.getCurrentDatabase();
        const dbTables = [];
        if (!tableNames) {
            const databasesSql = `SELECT DISTINCT "name" ` +
                `FROM "master"."dbo"."sysdatabases" ` +
                `WHERE "name" NOT IN ('master', 'model', 'msdb')`;
            const dbDatabases = await this.query(databasesSql);
            const tablesSql = dbDatabases
                .map(({ name }) => {
                return `
                    SELECT DISTINCT
                        "TABLE_CATALOG", "TABLE_SCHEMA", "TABLE_NAME"
                    FROM "${name}"."INFORMATION_SCHEMA"."TABLES"
                    WHERE
                      "TABLE_TYPE" = 'BASE TABLE'
                      AND
                      "TABLE_CATALOG" = '${name}'
                      AND
                      ISNULL(Objectproperty(Object_id("TABLE_CATALOG" + '.' + "TABLE_SCHEMA" + '.' + "TABLE_NAME"), 'IsMSShipped'), 0) = 0
                `;
            })
                .join(" UNION ALL ");
            dbTables.push(...(await this.query(tablesSql)));
        }
        else {
            const tableNamesByCatalog = tableNames
                .map((tableName) => this.driver.parseTableName(tableName))
                .reduce((c, { database, ...other }) => {
                database = database || currentDatabase;
                c[database] = c[database] || [];
                c[database].push({
                    schema: other.schema || currentSchema,
                    tableName: other.tableName,
                });
                return c;
            }, {});
            const tablesSql = Object.entries(tableNamesByCatalog)
                .map(([database, tables]) => {
                const tablesCondition = tables
                    .map(({ schema, tableName }) => {
                    return `("TABLE_SCHEMA" = '${schema}' AND "TABLE_NAME" = '${tableName}')`;
                })
                    .join(" OR ");
                return `
                    SELECT DISTINCT
                        "TABLE_CATALOG", "TABLE_SCHEMA", "TABLE_NAME"
                    FROM "${database}"."INFORMATION_SCHEMA"."TABLES"
                    WHERE
                          "TABLE_TYPE" = 'BASE TABLE' AND
                          "TABLE_CATALOG" = '${database}' AND
                          ${tablesCondition}
                `;
            })
                .join(" UNION ALL ");
            dbTables.push(...(await this.query(tablesSql)));
        }
        // if tables were not found in the db, no need to proceed
        if (dbTables.length === 0) {
            return [];
        }
        const dbTablesByCatalog = dbTables.reduce((c, { TABLE_CATALOG, ...other }) => {
            c[TABLE_CATALOG] = c[TABLE_CATALOG] || [];
            c[TABLE_CATALOG].push(other);
            return c;
        }, {});
        const columnsSql = Object.entries(dbTablesByCatalog)
            .map(([TABLE_CATALOG, tables]) => {
            const condition = tables
                .map(({ TABLE_SCHEMA, TABLE_NAME }) => `("TABLE_SCHEMA" = '${TABLE_SCHEMA}' AND "TABLE_NAME" = '${TABLE_NAME}')`)
                .join("OR");
            return (`SELECT "COLUMNS".*, "cc"."is_persisted", "cc"."definition" ` +
                `FROM "${TABLE_CATALOG}"."INFORMATION_SCHEMA"."COLUMNS" ` +
                `LEFT JOIN "sys"."computed_columns" "cc" ON COL_NAME("cc"."object_id", "cc"."column_id") = "column_name" ` +
                `WHERE (${condition})`);
        })
            .join(" UNION ALL ");
        const constraintsSql = Object.entries(dbTablesByCatalog)
            .map(([TABLE_CATALOG, tables]) => {
            const conditions = tables
                .map(({ TABLE_NAME, TABLE_SCHEMA }) => `("columnUsages"."TABLE_SCHEMA" = '${TABLE_SCHEMA}' AND "columnUsages"."TABLE_NAME" = '${TABLE_NAME}')`)
                .join(" OR ");
            return (`SELECT "columnUsages".*, "tableConstraints"."CONSTRAINT_TYPE", "chk"."definition" ` +
                `FROM "${TABLE_CATALOG}"."INFORMATION_SCHEMA"."CONSTRAINT_COLUMN_USAGE" "columnUsages" ` +
                `INNER JOIN "${TABLE_CATALOG}"."INFORMATION_SCHEMA"."TABLE_CONSTRAINTS" "tableConstraints" ` +
                `ON ` +
                `"tableConstraints"."CONSTRAINT_NAME" = "columnUsages"."CONSTRAINT_NAME" AND ` +
                `"tableConstraints"."TABLE_SCHEMA" = "columnUsages"."TABLE_SCHEMA" AND ` +
                `"tableConstraints"."TABLE_NAME" = "columnUsages"."TABLE_NAME" ` +
                `LEFT JOIN "${TABLE_CATALOG}"."sys"."check_constraints" "chk" ` +
                `ON ` +
                `"chk"."object_id" = OBJECT_ID("columnUsages"."TABLE_CATALOG" + '.' + "columnUsages"."TABLE_SCHEMA" + '.' + "columnUsages"."CONSTRAINT_NAME") ` +
                `WHERE ` +
                `(${conditions}) AND ` +
                `"tableConstraints"."CONSTRAINT_TYPE" IN ('PRIMARY KEY', 'UNIQUE', 'CHECK')`);
        })
            .join(" UNION ALL ");
        const foreignKeysSql = Object.entries(dbTablesByCatalog)
            .map(([TABLE_CATALOG, tables]) => {
            const conditions = tables
                .map(({ TABLE_NAME, TABLE_SCHEMA }) => `("s1"."name" = '${TABLE_SCHEMA}' AND "t1"."name" = '${TABLE_NAME}')`)
                .join(" OR ");
            return (`SELECT "fk"."name" AS "FK_NAME", '${TABLE_CATALOG}' AS "TABLE_CATALOG", "s1"."name" AS "TABLE_SCHEMA", "t1"."name" AS "TABLE_NAME", ` +
                `"col1"."name" AS "COLUMN_NAME", "s2"."name" AS "REF_SCHEMA", "t2"."name" AS "REF_TABLE", "col2"."name" AS "REF_COLUMN", ` +
                `"fk"."delete_referential_action_desc" AS "ON_DELETE", "fk"."update_referential_action_desc" AS "ON_UPDATE" ` +
                `FROM "${TABLE_CATALOG}"."sys"."foreign_keys" "fk" ` +
                `INNER JOIN "${TABLE_CATALOG}"."sys"."foreign_key_columns" "fkc" ON "fkc"."constraint_object_id" = "fk"."object_id" ` +
                `INNER JOIN "${TABLE_CATALOG}"."sys"."tables" "t1" ON "t1"."object_id" = "fk"."parent_object_id" ` +
                `INNER JOIN "${TABLE_CATALOG}"."sys"."schemas" "s1" ON "s1"."schema_id" = "t1"."schema_id" ` +
                `INNER JOIN "${TABLE_CATALOG}"."sys"."tables" "t2" ON "t2"."object_id" = "fk"."referenced_object_id" ` +
                `INNER JOIN "${TABLE_CATALOG}"."sys"."schemas" "s2" ON "s2"."schema_id" = "t2"."schema_id" ` +
                `INNER JOIN "${TABLE_CATALOG}"."sys"."columns" "col1" ON "col1"."column_id" = "fkc"."parent_column_id" AND "col1"."object_id" = "fk"."parent_object_id" ` +
                `INNER JOIN "${TABLE_CATALOG}"."sys"."columns" "col2" ON "col2"."column_id" = "fkc"."referenced_column_id" AND "col2"."object_id" = "fk"."referenced_object_id" ` +
                `WHERE (${conditions})`);
        })
            .join(" UNION ALL ");
        const identityColumnsSql = Object.entries(dbTablesByCatalog)
            .map(([TABLE_CATALOG, tables]) => {
            const conditions = tables
                .map(({ TABLE_NAME, TABLE_SCHEMA }) => `("TABLE_SCHEMA" = '${TABLE_SCHEMA}' AND "TABLE_NAME" = '${TABLE_NAME}')`)
                .join(" OR ");
            return (`SELECT "TABLE_CATALOG", "TABLE_SCHEMA", "COLUMN_NAME", "TABLE_NAME" ` +
                `FROM "${TABLE_CATALOG}"."INFORMATION_SCHEMA"."COLUMNS" ` +
                `WHERE ` +
                `EXISTS(SELECT 1 FROM "${TABLE_CATALOG}"."sys"."columns" "S" WHERE OBJECT_ID("TABLE_CATALOG" + '.' + "TABLE_SCHEMA" + '.' + "TABLE_NAME") = "S"."OBJECT_ID" AND "COLUMN_NAME" = "S"."NAME" AND "S"."is_identity" = 1) AND ` +
                `(${conditions})`);
        })
            .join(" UNION ALL ");
        const dbCollationsSql = `SELECT "NAME", "COLLATION_NAME" FROM "sys"."databases"`;
        const indicesSql = Object.entries(dbTablesByCatalog)
            .map(([TABLE_CATALOG, tables]) => {
            const conditions = tables
                .map(({ TABLE_NAME, TABLE_SCHEMA }) => `("s"."name" = '${TABLE_SCHEMA}' AND "t"."name" = '${TABLE_NAME}')`)
                .join(" OR ");
            return (`SELECT '${TABLE_CATALOG}' AS "TABLE_CATALOG", "s"."name" AS "TABLE_SCHEMA", "t"."name" AS "TABLE_NAME", ` +
                `"ind"."name" AS "INDEX_NAME", "col"."name" AS "COLUMN_NAME", "ind"."is_unique" AS "IS_UNIQUE", "ind"."filter_definition" as "CONDITION" ` +
                `FROM "${TABLE_CATALOG}"."sys"."indexes" "ind" ` +
                `INNER JOIN "${TABLE_CATALOG}"."sys"."index_columns" "ic" ON "ic"."object_id" = "ind"."object_id" AND "ic"."index_id" = "ind"."index_id" ` +
                `INNER JOIN "${TABLE_CATALOG}"."sys"."columns" "col" ON "col"."object_id" = "ic"."object_id" AND "col"."column_id" = "ic"."column_id" ` +
                `INNER JOIN "${TABLE_CATALOG}"."sys"."tables" "t" ON "t"."object_id" = "ind"."object_id" ` +
                `INNER JOIN "${TABLE_CATALOG}"."sys"."schemas" "s" ON "s"."schema_id" = "t"."schema_id" ` +
                `WHERE ` +
                `"ind"."is_primary_key" = 0 AND "ind"."is_unique_constraint" = 0 AND "t"."is_ms_shipped" = 0 AND ` +
                `(${conditions})`);
        })
            .join(" UNION ALL ");
        const [dbColumns, dbConstraints, dbForeignKeys, dbIdentityColumns, dbCollations, dbIndices,] = await Promise.all([
            this.query(columnsSql),
            this.query(constraintsSql),
            this.query(foreignKeysSql),
            this.query(identityColumnsSql),
            this.query(dbCollationsSql),
            this.query(indicesSql),
        ]);
        // create table schemas for loaded tables
        return await Promise.all(dbTables.map(async (dbTable) => {
            const table = new Table();
            const getSchemaFromKey = (dbObject, key) => {
                return dbObject[key] === currentSchema &&
                    (!this.driver.options.schema ||
                        this.driver.options.schema === currentSchema)
                    ? undefined
                    : dbObject[key];
            };
            // We do not need to join schema and database names, when db or schema is by default.
            const db = dbTable["TABLE_CATALOG"] === currentDatabase
                ? undefined
                : dbTable["TABLE_CATALOG"];
            const schema = getSchemaFromKey(dbTable, "TABLE_SCHEMA");
            table.database = dbTable["TABLE_CATALOG"];
            table.schema = dbTable["TABLE_SCHEMA"];
            table.name = this.driver.buildTableName(dbTable["TABLE_NAME"], schema, db);
            const defaultCollation = dbCollations.find((dbCollation) => dbCollation["NAME"] === dbTable["TABLE_CATALOG"]);
            // create columns from the loaded columns
            table.columns = await Promise.all(dbColumns
                .filter((dbColumn) => dbColumn["TABLE_NAME"] ===
                dbTable["TABLE_NAME"] &&
                dbColumn["TABLE_SCHEMA"] ===
                    dbTable["TABLE_SCHEMA"] &&
                dbColumn["TABLE_CATALOG"] ===
                    dbTable["TABLE_CATALOG"])
                .map(async (dbColumn) => {
                const columnConstraints = dbConstraints.filter((dbConstraint) => dbConstraint["TABLE_NAME"] ===
                    dbColumn["TABLE_NAME"] &&
                    dbConstraint["TABLE_SCHEMA"] ===
                        dbColumn["TABLE_SCHEMA"] &&
                    dbConstraint["TABLE_CATALOG"] ===
                        dbColumn["TABLE_CATALOG"] &&
                    dbConstraint["COLUMN_NAME"] ===
                        dbColumn["COLUMN_NAME"]);
                const uniqueConstraints = columnConstraints.filter((constraint) => constraint["CONSTRAINT_TYPE"] === "UNIQUE");
                const isConstraintComposite = uniqueConstraints.every((uniqueConstraint) => {
                    return dbConstraints.some((dbConstraint) => dbConstraint["CONSTRAINT_TYPE"] ===
                        "UNIQUE" &&
                        dbConstraint["CONSTRAINT_NAME"] ===
                            uniqueConstraint["CONSTRAINT_NAME"] &&
                        dbConstraint["TABLE_SCHEMA"] ===
                            dbColumn["TABLE_SCHEMA"] &&
                        dbConstraint["TABLE_CATALOG"] ===
                            dbColumn["TABLE_CATALOG"] &&
                        dbConstraint["COLUMN_NAME"] !==
                            dbColumn["COLUMN_NAME"]);
                });
                const isGenerated = !!dbIdentityColumns.find((column) => column["TABLE_NAME"] ===
                    dbColumn["TABLE_NAME"] &&
                    column["TABLE_SCHEMA"] ===
                        dbColumn["TABLE_SCHEMA"] &&
                    column["TABLE_CATALOG"] ===
                        dbColumn["TABLE_CATALOG"] &&
                    column["COLUMN_NAME"] ===
                        dbColumn["COLUMN_NAME"]);
                const tableColumn = new TableColumn();
                tableColumn.name = dbColumn["COLUMN_NAME"];
                tableColumn.type =
                    dbColumn["DATA_TYPE"].toLowerCase();
                // check only columns that have length property
                if (this.driver.withLengthColumnTypes.indexOf(tableColumn.type) !== -1 &&
                    dbColumn["CHARACTER_MAXIMUM_LENGTH"]) {
                    const length = dbColumn["CHARACTER_MAXIMUM_LENGTH"].toString();
                    if (length === "-1") {
                        tableColumn.length = "MAX";
                    }
                    else {
                        tableColumn.length =
                            !this.isDefaultColumnLength(table, tableColumn, length)
                                ? length
                                : "";
                    }
                }
                if (tableColumn.type === "decimal" ||
                    tableColumn.type === "numeric") {
                    if (dbColumn["NUMERIC_PRECISION"] !== null &&
                        !this.isDefaultColumnPrecision(table, tableColumn, dbColumn["NUMERIC_PRECISION"]))
                        tableColumn.precision =
                            dbColumn["NUMERIC_PRECISION"];
                    if (dbColumn["NUMERIC_SCALE"] !== null &&
                        !this.isDefaultColumnScale(table, tableColumn, dbColumn["NUMERIC_SCALE"]))
                        tableColumn.scale =
                            dbColumn["NUMERIC_SCALE"];
                }
                if (tableColumn.type === "nvarchar") {
                    // Check if this is an enum
                    const columnCheckConstraints = columnConstraints.filter((constraint) => constraint["CONSTRAINT_TYPE"] ===
                        "CHECK");
                    if (columnCheckConstraints.length) {
                        // const isEnumRegexp = new RegExp("^\\(\\[" + tableColumn.name + "\\]='[^']+'(?: OR \\[" + tableColumn.name + "\\]='[^']+')*\\)$");
                        for (const checkConstraint of columnCheckConstraints) {
                            if (this.isEnumCheckConstraint(checkConstraint["CONSTRAINT_NAME"])) {
                                // This is an enum constraint, make column into an enum
                                tableColumn.enum = [];
                                const enumValueRegexp = new RegExp("\\[" +
                                    tableColumn.name +
                                    "\\]='([^']+)'", "g");
                                let result;
                                while ((result = enumValueRegexp.exec(checkConstraint["definition"])) !== null) {
                                    tableColumn.enum.unshift(result[1]);
                                }
                                // Skip other column constraints
                                break;
                            }
                        }
                    }
                }
                const primaryConstraint = columnConstraints.find((constraint) => constraint["CONSTRAINT_TYPE"] ===
                    "PRIMARY KEY");
                if (primaryConstraint) {
                    tableColumn.isPrimary = true;
                    // find another columns involved in primary key constraint
                    const anotherPrimaryConstraints = dbConstraints.filter((constraint) => constraint["TABLE_NAME"] ===
                        dbColumn["TABLE_NAME"] &&
                        constraint["TABLE_SCHEMA"] ===
                            dbColumn["TABLE_SCHEMA"] &&
                        constraint["TABLE_CATALOG"] ===
                            dbColumn["TABLE_CATALOG"] &&
                        constraint["COLUMN_NAME"] !==
                            dbColumn["COLUMN_NAME"] &&
                        constraint["CONSTRAINT_TYPE"] ===
                            "PRIMARY KEY");
                    // collect all column names
                    const columnNames = anotherPrimaryConstraints.map((constraint) => constraint["COLUMN_NAME"]);
                    columnNames.push(dbColumn["COLUMN_NAME"]);
                    // build default primary key constraint name
                    const pkName = this.connection.namingStrategy.primaryKeyName(table, columnNames);
                    // if primary key has user-defined constraint name, write it in table column
                    if (primaryConstraint["CONSTRAINT_NAME"] !==
                        pkName) {
                        tableColumn.primaryKeyConstraintName =
                            primaryConstraint["CONSTRAINT_NAME"];
                    }
                }
                tableColumn.default =
                    dbColumn["COLUMN_DEFAULT"] !== null &&
                        dbColumn["COLUMN_DEFAULT"] !== undefined
                        ? this.removeParenthesisFromDefault(dbColumn["COLUMN_DEFAULT"])
                        : undefined;
                tableColumn.isNullable =
                    dbColumn["IS_NULLABLE"] === "YES";
                tableColumn.isUnique =
                    uniqueConstraints.length > 0 &&
                        !isConstraintComposite;
                tableColumn.isGenerated = isGenerated;
                if (isGenerated)
                    tableColumn.generationStrategy = "increment";
                if (tableColumn.default === "newsequentialid()") {
                    tableColumn.isGenerated = true;
                    tableColumn.generationStrategy = "uuid";
                    tableColumn.default = undefined;
                }
                // todo: unable to get default charset
                // tableColumn.charset = dbColumn["CHARACTER_SET_NAME"];
                if (dbColumn["COLLATION_NAME"])
                    tableColumn.collation =
                        dbColumn["COLLATION_NAME"] ===
                            defaultCollation["COLLATION_NAME"]
                            ? undefined
                            : dbColumn["COLLATION_NAME"];
                if (tableColumn.type === "datetime2" ||
                    tableColumn.type === "time" ||
                    tableColumn.type === "datetimeoffset") {
                    tableColumn.precision =
                        !this.isDefaultColumnPrecision(table, tableColumn, dbColumn["DATETIME_PRECISION"])
                            ? dbColumn["DATETIME_PRECISION"]
                            : undefined;
                }
                if (dbColumn["is_persisted"] !== null &&
                    dbColumn["is_persisted"] !== undefined &&
                    dbColumn["definition"]) {
                    tableColumn.generatedType =
                        dbColumn["is_persisted"] === true
                            ? "STORED"
                            : "VIRTUAL";
                    // We cannot relay on information_schema.columns.generation_expression, because it is formatted different.
                    const asExpressionQuery = await this.selectTypeormMetadataSql({
                        database: dbTable["TABLE_CATALOG"],
                        schema: dbTable["TABLE_SCHEMA"],
                        table: dbTable["TABLE_NAME"],
                        type: MetadataTableType.GENERATED_COLUMN,
                        name: tableColumn.name,
                    });
                    const results = await this.query(asExpressionQuery.query, asExpressionQuery.parameters);
                    if (results[0] && results[0].value) {
                        tableColumn.asExpression = results[0].value;
                    }
                    else {
                        tableColumn.asExpression = "";
                    }
                }
                return tableColumn;
            }));
            // find unique constraints of table, group them by constraint name and build TableUnique.
            const tableUniqueConstraints = OrmUtils.uniq(dbConstraints.filter((dbConstraint) => dbConstraint["TABLE_NAME"] ===
                dbTable["TABLE_NAME"] &&
                dbConstraint["TABLE_SCHEMA"] ===
                    dbTable["TABLE_SCHEMA"] &&
                dbConstraint["TABLE_CATALOG"] ===
                    dbTable["TABLE_CATALOG"] &&
                dbConstraint["CONSTRAINT_TYPE"] === "UNIQUE"), (dbConstraint) => dbConstraint["CONSTRAINT_NAME"]);
            table.uniques = tableUniqueConstraints.map((constraint) => {
                const uniques = dbConstraints.filter((dbC) => dbC["CONSTRAINT_NAME"] ===
                    constraint["CONSTRAINT_NAME"]);
                return new TableUnique({
                    name: constraint["CONSTRAINT_NAME"],
                    columnNames: uniques.map((u) => u["COLUMN_NAME"]),
                });
            });
            // find check constraints of table, group them by constraint name and build TableCheck.
            const tableCheckConstraints = OrmUtils.uniq(dbConstraints.filter((dbConstraint) => dbConstraint["TABLE_NAME"] ===
                dbTable["TABLE_NAME"] &&
                dbConstraint["TABLE_SCHEMA"] ===
                    dbTable["TABLE_SCHEMA"] &&
                dbConstraint["TABLE_CATALOG"] ===
                    dbTable["TABLE_CATALOG"] &&
                dbConstraint["CONSTRAINT_TYPE"] === "CHECK"), (dbConstraint) => dbConstraint["CONSTRAINT_NAME"]);
            table.checks = tableCheckConstraints
                .filter((constraint) => !this.isEnumCheckConstraint(constraint["CONSTRAINT_NAME"]))
                .map((constraint) => {
                const checks = dbConstraints.filter((dbC) => dbC["CONSTRAINT_NAME"] ===
                    constraint["CONSTRAINT_NAME"]);
                return new TableCheck({
                    name: constraint["CONSTRAINT_NAME"],
                    columnNames: checks.map((c) => c["COLUMN_NAME"]),
                    expression: constraint["definition"],
                });
            });
            // find foreign key constraints of table, group them by constraint name and build TableForeignKey.
            const tableForeignKeyConstraints = OrmUtils.uniq(dbForeignKeys.filter((dbForeignKey) => dbForeignKey["TABLE_NAME"] ===
                dbTable["TABLE_NAME"] &&
                dbForeignKey["TABLE_SCHEMA"] ===
                    dbTable["TABLE_SCHEMA"] &&
                dbForeignKey["TABLE_CATALOG"] ===
                    dbTable["TABLE_CATALOG"]), (dbForeignKey) => dbForeignKey["FK_NAME"]);
            table.foreignKeys = tableForeignKeyConstraints.map((dbForeignKey) => {
                const foreignKeys = dbForeignKeys.filter((dbFk) => dbFk["FK_NAME"] === dbForeignKey["FK_NAME"]);
                // if referenced table located in currently used db and schema, we don't need to concat db and schema names to table name.
                const db = dbForeignKey["TABLE_CATALOG"] === currentDatabase
                    ? undefined
                    : dbForeignKey["TABLE_CATALOG"];
                const schema = getSchemaFromKey(dbForeignKey, "REF_SCHEMA");
                const referencedTableName = this.driver.buildTableName(dbForeignKey["REF_TABLE"], schema, db);
                return new TableForeignKey({
                    name: dbForeignKey["FK_NAME"],
                    columnNames: foreignKeys.map((dbFk) => dbFk["COLUMN_NAME"]),
                    referencedDatabase: dbForeignKey["TABLE_CATALOG"],
                    referencedSchema: dbForeignKey["REF_SCHEMA"],
                    referencedTableName: referencedTableName,
                    referencedColumnNames: foreignKeys.map((dbFk) => dbFk["REF_COLUMN"]),
                    onDelete: dbForeignKey["ON_DELETE"].replace("_", " "),
                    onUpdate: dbForeignKey["ON_UPDATE"].replace("_", " "), // SqlServer returns NO_ACTION, instead of NO ACTION
                });
            });
            // find index constraints of table, group them by constraint name and build TableIndex.
            const tableIndexConstraints = OrmUtils.uniq(dbIndices.filter((dbIndex) => dbIndex["TABLE_NAME"] === dbTable["TABLE_NAME"] &&
                dbIndex["TABLE_SCHEMA"] ===
                    dbTable["TABLE_SCHEMA"] &&
                dbIndex["TABLE_CATALOG"] ===
                    dbTable["TABLE_CATALOG"]), (dbIndex) => dbIndex["INDEX_NAME"]);
            table.indices = tableIndexConstraints.map((constraint) => {
                const indices = dbIndices.filter((index) => {
                    return (index["TABLE_CATALOG"] ===
                        constraint["TABLE_CATALOG"] &&
                        index["TABLE_SCHEMA"] ===
                            constraint["TABLE_SCHEMA"] &&
                        index["TABLE_NAME"] === constraint["TABLE_NAME"] &&
                        index["INDEX_NAME"] === constraint["INDEX_NAME"]);
                });
                return new TableIndex({
                    table: table,
                    name: constraint["INDEX_NAME"],
                    columnNames: indices.map((i) => i["COLUMN_NAME"]),
                    isUnique: constraint["IS_UNIQUE"],
                    where: constraint["CONDITION"],
                });
            });
            return table;
        }));
    }
    /**
     * Builds and returns SQL for create table.
     */
    createTableSql(table, createForeignKeys) {
        const columnDefinitions = table.columns
            .map((column) => this.buildCreateColumnSql(table, column, false, true))
            .join(", ");
        let sql = `CREATE TABLE ${this.escapePath(table)} (${columnDefinitions}`;
        table.columns
            .filter((column) => column.isUnique)
            .forEach((column) => {
            const isUniqueExist = table.uniques.some((unique) => unique.columnNames.length === 1 &&
                unique.columnNames[0] === column.name);
            if (!isUniqueExist)
                table.uniques.push(new TableUnique({
                    name: this.connection.namingStrategy.uniqueConstraintName(table, [column.name]),
                    columnNames: [column.name],
                }));
        });
        if (table.uniques.length > 0) {
            const uniquesSql = table.uniques
                .map((unique) => {
                const uniqueName = unique.name
                    ? unique.name
                    : this.connection.namingStrategy.uniqueConstraintName(table, unique.columnNames);
                const columnNames = unique.columnNames
                    .map((columnName) => `"${columnName}"`)
                    .join(", ");
                return `CONSTRAINT "${uniqueName}" UNIQUE (${columnNames})`;
            })
                .join(", ");
            sql += `, ${uniquesSql}`;
        }
        if (table.checks.length > 0) {
            const checksSql = table.checks
                .map((check) => {
                const checkName = check.name
                    ? check.name
                    : this.connection.namingStrategy.checkConstraintName(table, check.expression);
                return `CONSTRAINT "${checkName}" CHECK (${check.expression})`;
            })
                .join(", ");
            sql += `, ${checksSql}`;
        }
        if (table.foreignKeys.length > 0 && createForeignKeys) {
            const foreignKeysSql = table.foreignKeys
                .map((fk) => {
                const columnNames = fk.columnNames
                    .map((columnName) => `"${columnName}"`)
                    .join(", ");
                if (!fk.name)
                    fk.name = this.connection.namingStrategy.foreignKeyName(table, fk.columnNames, this.getTablePath(fk), fk.referencedColumnNames);
                const referencedColumnNames = fk.referencedColumnNames
                    .map((columnName) => `"${columnName}"`)
                    .join(", ");
                let constraint = `CONSTRAINT "${fk.name}" FOREIGN KEY (${columnNames}) REFERENCES ${this.escapePath(this.getTablePath(fk))} (${referencedColumnNames})`;
                if (fk.onDelete)
                    constraint += ` ON DELETE ${fk.onDelete}`;
                if (fk.onUpdate)
                    constraint += ` ON UPDATE ${fk.onUpdate}`;
                return constraint;
            })
                .join(", ");
            sql += `, ${foreignKeysSql}`;
        }
        const primaryColumns = table.columns.filter((column) => column.isPrimary);
        if (primaryColumns.length > 0) {
            const primaryKeyName = primaryColumns[0].primaryKeyConstraintName
                ? primaryColumns[0].primaryKeyConstraintName
                : this.connection.namingStrategy.primaryKeyName(table, primaryColumns.map((column) => column.name));
            const columnNames = primaryColumns
                .map((column) => `"${column.name}"`)
                .join(", ");
            sql += `, CONSTRAINT "${primaryKeyName}" PRIMARY KEY (${columnNames})`;
        }
        sql += `)`;
        return new Query(sql);
    }
    /**
     * Builds drop table sql.
     */
    dropTableSql(tableOrName, ifExist) {
        const query = ifExist
            ? `DROP TABLE IF EXISTS ${this.escapePath(tableOrName)}`
            : `DROP TABLE ${this.escapePath(tableOrName)}`;
        return new Query(query);
    }
    createViewSql(view) {
        const parsedName = this.driver.parseTableName(view);
        // Can't use `escapePath` here because `CREATE VIEW` does not accept database names.
        const viewIdentifier = parsedName.schema
            ? `"${parsedName.schema}"."${parsedName.tableName}"`
            : `"${parsedName.tableName}"`;
        if (typeof view.expression === "string") {
            return new Query(`CREATE VIEW ${viewIdentifier} AS ${view.expression}`);
        }
        else {
            return new Query(`CREATE VIEW ${viewIdentifier} AS ${view
                .expression(this.connection)
                .getQuery()}`);
        }
    }
    async insertViewDefinitionSql(view) {
        const parsedTableName = this.driver.parseTableName(view);
        if (!parsedTableName.schema) {
            parsedTableName.schema = await this.getCurrentSchema();
        }
        const expression = typeof view.expression === "string"
            ? view.expression.trim()
            : view.expression(this.connection).getQuery();
        return this.insertTypeormMetadataSql({
            type: MetadataTableType.VIEW,
            database: parsedTableName.database,
            schema: parsedTableName.schema,
            name: parsedTableName.tableName,
            value: expression,
        });
    }
    /**
     * Builds drop view sql.
     */
    dropViewSql(viewOrPath) {
        return new Query(`DROP VIEW ${this.escapePath(viewOrPath)}`);
    }
    /**
     * Builds remove view sql.
     */
    async deleteViewDefinitionSql(viewOrPath) {
        const parsedTableName = this.driver.parseTableName(viewOrPath);
        if (!parsedTableName.schema) {
            parsedTableName.schema = await this.getCurrentSchema();
        }
        return this.deleteTypeormMetadataSql({
            type: MetadataTableType.VIEW,
            database: parsedTableName.database,
            schema: parsedTableName.schema,
            name: parsedTableName.tableName,
        });
    }
    /**
     * Builds create index sql.
     */
    createIndexSql(table, index) {
        const columns = index.columnNames
            .map((columnName) => `"${columnName}"`)
            .join(", ");
        return new Query(`CREATE ${index.isUnique ? "UNIQUE " : ""}INDEX "${index.name}" ON ${this.escapePath(table)} (${columns}) ${index.where ? "WHERE " + index.where : ""}`);
    }
    /**
     * Builds drop index sql.
     */
    dropIndexSql(table, indexOrName) {
        let indexName = InstanceChecker.isTableIndex(indexOrName)
            ? indexOrName.name
            : indexOrName;
        return new Query(`DROP INDEX "${indexName}" ON ${this.escapePath(table)}`);
    }
    /**
     * Builds create primary key sql.
     */
    createPrimaryKeySql(table, columnNames, constraintName) {
        const primaryKeyName = constraintName
            ? constraintName
            : this.connection.namingStrategy.primaryKeyName(table, columnNames);
        const columnNamesString = columnNames
            .map((columnName) => `"${columnName}"`)
            .join(", ");
        return new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${primaryKeyName}" PRIMARY KEY (${columnNamesString})`);
    }
    /**
     * Builds drop primary key sql.
     */
    dropPrimaryKeySql(table) {
        const columnNames = table.primaryColumns.map((column) => column.name);
        const constraintName = table.primaryColumns[0].primaryKeyConstraintName;
        const primaryKeyName = constraintName
            ? constraintName
            : this.connection.namingStrategy.primaryKeyName(table, columnNames);
        return new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${primaryKeyName}"`);
    }
    /**
     * Builds create unique constraint sql.
     */
    createUniqueConstraintSql(table, uniqueConstraint) {
        const columnNames = uniqueConstraint.columnNames
            .map((column) => `"` + column + `"`)
            .join(", ");
        return new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${uniqueConstraint.name}" UNIQUE (${columnNames})`);
    }
    /**
     * Builds drop unique constraint sql.
     */
    dropUniqueConstraintSql(table, uniqueOrName) {
        const uniqueName = InstanceChecker.isTableUnique(uniqueOrName)
            ? uniqueOrName.name
            : uniqueOrName;
        return new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${uniqueName}"`);
    }
    /**
     * Builds create check constraint sql.
     */
    createCheckConstraintSql(table, checkConstraint) {
        return new Query(`ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${checkConstraint.name}" CHECK (${checkConstraint.expression})`);
    }
    /**
     * Builds drop check constraint sql.
     */
    dropCheckConstraintSql(table, checkOrName) {
        const checkName = InstanceChecker.isTableCheck(checkOrName)
            ? checkOrName.name
            : checkOrName;
        return new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${checkName}"`);
    }
    /**
     * Builds create foreign key sql.
     */
    createForeignKeySql(table, foreignKey) {
        const columnNames = foreignKey.columnNames
            .map((column) => `"` + column + `"`)
            .join(", ");
        const referencedColumnNames = foreignKey.referencedColumnNames
            .map((column) => `"` + column + `"`)
            .join(",");
        let sql = `ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT "${foreignKey.name}" FOREIGN KEY (${columnNames}) ` +
            `REFERENCES ${this.escapePath(this.getTablePath(foreignKey))}(${referencedColumnNames})`;
        if (foreignKey.onDelete)
            sql += ` ON DELETE ${foreignKey.onDelete}`;
        if (foreignKey.onUpdate)
            sql += ` ON UPDATE ${foreignKey.onUpdate}`;
        return new Query(sql);
    }
    /**
     * Builds drop foreign key sql.
     */
    dropForeignKeySql(table, foreignKeyOrName) {
        const foreignKeyName = InstanceChecker.isTableForeignKey(foreignKeyOrName)
            ? foreignKeyOrName.name
            : foreignKeyOrName;
        return new Query(`ALTER TABLE ${this.escapePath(table)} DROP CONSTRAINT "${foreignKeyName}"`);
    }
    /**
     * Escapes given table or View path.
     */
    escapePath(target) {
        const { database, schema, tableName } = this.driver.parseTableName(target);
        if (database && database !== this.driver.database) {
            if (schema && schema !== this.driver.searchSchema) {
                return `"${database}"."${schema}"."${tableName}"`;
            }
            return `"${database}".."${tableName}"`;
        }
        if (schema && schema !== this.driver.searchSchema) {
            return `"${schema}"."${tableName}"`;
        }
        return `"${tableName}"`;
    }
    /**
     * Concat database name and schema name to the foreign key name.
     * Needs because FK name is relevant to the schema and database.
     */
    buildForeignKeyName(fkName, schemaName, dbName) {
        let joinedFkName = fkName;
        if (schemaName && schemaName !== this.driver.searchSchema)
            joinedFkName = schemaName + "." + joinedFkName;
        if (dbName && dbName !== this.driver.database)
            joinedFkName = dbName + "." + joinedFkName;
        return joinedFkName;
    }
    /**
     * Removes parenthesis around default value.
     * Sql server returns default value with parenthesis around, e.g.
     *  ('My text') - for string
     *  ((1)) - for number
     *  (newsequentialId()) - for function
     */
    removeParenthesisFromDefault(defaultValue) {
        if (defaultValue.substr(0, 1) !== "(")
            return defaultValue;
        const normalizedDefault = defaultValue.substr(1, defaultValue.lastIndexOf(")") - 1);
        return this.removeParenthesisFromDefault(normalizedDefault);
    }
    /**
     * Builds a query for create column.
     */
    buildCreateColumnSql(table, column, skipIdentity, createDefault) {
        let c = `"${column.name}" ${this.connection.driver.createFullType(column)}`;
        if (column.enum) {
            const expression = column.name +
                " IN (" +
                column.enum.map((val) => "'" + val + "'").join(",") +
                ")";
            const checkName = this.connection.namingStrategy.checkConstraintName(table, expression, true);
            c += ` CONSTRAINT ${checkName} CHECK(${expression})`;
        }
        if (column.collation)
            c += " COLLATE " + column.collation;
        if (column.asExpression) {
            c += ` AS (${column.asExpression})`;
            if (column.generatedType === "STORED") {
                c += ` PERSISTED`;
                // NOT NULL can be specified for computed columns only if PERSISTED is also specified
                if (column.isNullable !== true)
                    c += " NOT NULL";
            }
        }
        else {
            if (column.isNullable !== true)
                c += " NOT NULL";
        }
        if (column.isGenerated === true &&
            column.generationStrategy === "increment" &&
            !skipIdentity)
            // don't use skipPrimary here since updates can update already exist primary without auto inc.
            c += " IDENTITY(1,1)";
        if (column.default !== undefined &&
            column.default !== null &&
            createDefault) {
            // we create named constraint to be able to delete this constraint when column been dropped
            const defaultName = this.connection.namingStrategy.defaultConstraintName(table, column.name);
            c += ` CONSTRAINT "${defaultName}" DEFAULT ${column.default}`;
        }
        if (column.isGenerated &&
            column.generationStrategy === "uuid" &&
            !column.default) {
            // we create named constraint to be able to delete this constraint when column been dropped
            const defaultName = this.connection.namingStrategy.defaultConstraintName(table, column.name);
            c += ` CONSTRAINT "${defaultName}" DEFAULT NEWSEQUENTIALID()`;
        }
        return c;
    }
    isEnumCheckConstraint(name) {
        return name.indexOf("CHK_") !== -1 && name.indexOf("_ENUM") !== -1;
    }
    /**
     * Converts MssqlParameter into real mssql parameter type.
     */
    mssqlParameterToNativeParameter(parameter) {
        switch (this.driver.normalizeType({ type: parameter.type })) {
            case "bit":
                return this.driver.mssql.Bit;
            case "bigint":
                return this.driver.mssql.BigInt;
            case "decimal":
                return this.driver.mssql.Decimal(...parameter.params);
            case "float":
                return this.driver.mssql.Float;
            case "int":
                return this.driver.mssql.Int;
            case "money":
                return this.driver.mssql.Money;
            case "numeric":
                return this.driver.mssql.Numeric(...parameter.params);
            case "smallint":
                return this.driver.mssql.SmallInt;
            case "smallmoney":
                return this.driver.mssql.SmallMoney;
            case "real":
                return this.driver.mssql.Real;
            case "tinyint":
                return this.driver.mssql.TinyInt;
            case "char":
            case "nchar":
                return this.driver.mssql.NChar(...parameter.params);
            case "text":
            case "ntext":
                return this.driver.mssql.Ntext;
            case "varchar":
            case "nvarchar":
                return this.driver.mssql.NVarChar(...parameter.params);
            case "xml":
                return this.driver.mssql.Xml;
            case "time":
                return this.driver.mssql.Time(...parameter.params);
            case "date":
                return this.driver.mssql.Date;
            case "datetime":
                return this.driver.mssql.DateTime;
            case "datetime2":
                return this.driver.mssql.DateTime2(...parameter.params);
            case "datetimeoffset":
                return this.driver.mssql.DateTimeOffset(...parameter.params);
            case "smalldatetime":
                return this.driver.mssql.SmallDateTime;
            case "uniqueidentifier":
                return this.driver.mssql.UniqueIdentifier;
            case "variant":
                return this.driver.mssql.Variant;
            case "binary":
                return this.driver.mssql.Binary;
            case "varbinary":
                return this.driver.mssql.VarBinary(...parameter.params);
            case "image":
                return this.driver.mssql.Image;
            case "udt":
                return this.driver.mssql.UDT;
            case "rowversion":
                return this.driver.mssql.RowVersion;
        }
    }
    /**
     * Converts string literal of isolation level to enum.
     * The underlying mssql driver requires an enum for the isolation level.
     */
    convertIsolationLevel(isolation) {
        const ISOLATION_LEVEL = this.driver.mssql.ISOLATION_LEVEL;
        switch (isolation) {
            case "READ UNCOMMITTED":
                return ISOLATION_LEVEL.READ_UNCOMMITTED;
            case "REPEATABLE READ":
                return ISOLATION_LEVEL.REPEATABLE_READ;
            case "SERIALIZABLE":
                return ISOLATION_LEVEL.SERIALIZABLE;
            case "READ COMMITTED":
            default:
                return ISOLATION_LEVEL.READ_COMMITTED;
        }
    }
}

//# sourceMappingURL=SqlServerQueryRunner.js.map
