| MssqlAdapter | This is used to connect to a MSSQL database. |
| MysqlAdapter | This is used in order to connect to a MySQL database. |
| OracleAdapter | Oracle adapter. |
| PdoAdapter | Base for PDO database adapters. |
| PdoConnection | PDO extension that implements ConnectionInterface and builds statements implementing StatementInterface. |
| PdoStatement | PDO statement that provides the basic enhancements that are required by Propel. |
| PgsqlAdapter | This is used to connect to PostgreSQL databases. |
| SqliteAdapter | This is used in order to connect to a SQLite database. |
| SqlsrvAdapter | This is used to connect to a MSSQL database using pdo_sqlsrv driver. |