(PECL ibm_db2 >= 1.0.0)
db2_special_columns — Returns a result set listing the unique row identifier columns for a table
$connection
   , string $qualifier
   , string $schema
   , string $table_name
   , int $scope
   )Returns a result set listing the unique row identifier columns for a table.
connectionA valid connection to an IBM DB2, Cloudscape, or Apache Derby database.
qualifier
       A qualifier for DB2 databases running on OS/390 or z/OS servers. For
       other databases, pass NULL or an empty string.
      
schemaThe schema which contains the tables.
table_nameThe name of the table.
scopeInteger value representing the minimum duration for which the unique row identifier is valid. This can be one of the following values:
| Integer value | SQL constant | Description | 
|---|---|---|
| 0 | SQL_SCOPE_CURROW | Row identifier is valid only while the cursor is positioned on the row. | 
| 1 | SQL_SCOPE_TRANSACTION | Row identifier is valid for the duration of the transaction. | 
| 2 | SQL_SCOPE_SESSION | Row identifier is valid for the duration of the connection. | 
Returns a statement resource with a result set containing rows with unique row identifier information for a table. The rows are composed of the following columns:
| Column name | Description | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SCOPE | 
 
 | ||||||||||||
| COLUMN_NAME | Name of the unique column. | ||||||||||||
| DATA_TYPE | SQL data type for the column. | ||||||||||||
| TYPE_NAME | Character string representation of the SQL data type for the column. | ||||||||||||
| COLUMN_SIZE | An integer value representing the size of the column. | ||||||||||||
| BUFFER_LENGTH | Maximum number of bytes necessary to store data from this column. | ||||||||||||
| DECIMAL_DIGITS | The scale of the column, or NULLwhere scale is not applicable. | ||||||||||||
| NUM_PREC_RADIX | An integer value of either 10 (representing
        an exact numeric data type), 2 (representing an
        approximate numeric data type), or NULL(representing a data type for
        which radix is not applicable). | ||||||||||||
| PSEUDO_COLUMN | Always returns 1. |