# PDO_DBLIB DSN

(PECL PDO_DBLIB >= 0.9.0)

PDO_DBLIB DSN — Connecting to Microsoft SQL Server and Sybase databases

### Description

The PDO_DBLIB Data Source Name (DSN) is composed of the following elements:

DSN prefix

  The DSN prefix is `sybase:` if PDO_DBLIB was linked against the Sybase ct-lib libraries, `mssql:` if PDO_DBLIB was linked against the Microsoft SQL Server libraries, or `dblib:` if PDO_DBLIB was linked against the FreeTDS libraries.

`host`

  The hostname on which the database server resides. Defaults to 127.0.0.1.

`dbname`

  The name of the database.

`charset`

  The client character set.

`appname`

  The application name (used in sysprocesses). Defaults to "PHP Generic DB-lib" or "PHP freetds".

`secure`

  Currently unused.

### Examples

Example #1 PDO_DBLIB DSN examples

The following examples show a PDO_DBLIB DSN for connecting to Microsoft SQL Server and Sybase databases:

    mssql:host=localhost;dbname=testdb
    sybase:host=localhost;dbname=testdb
    dblib:host=localhost;dbname=testdb