The following drivers currently implement the PDO interface:
| Driver name | Supported databases | 
|---|---|
| PDO_CUBRID | Cubrid | 
| PDO_DBLIB | FreeTDS / Microsoft SQL Server / Sybase | 
| PDO_FIREBIRD | Firebird | 
| PDO_IBM | IBM DB2 | 
| PDO_INFORMIX | IBM Informix Dynamic Server | 
| PDO_MYSQL | MySQL 3.x/4.x/5.x | 
| PDO_OCI | Oracle Call Interface | 
| PDO_ODBC | ODBC v3 (IBM DB2, unixODBC and win32 ODBC) | 
| PDO_PGSQL | PostgreSQL | 
| PDO_SQLITE | SQLite 3 and SQLite 2 | 
| PDO_SQLSRV | Microsoft SQL Server / SQL Azure | 
| PDO_4D | 4D |