The PDO_ODBC Data Source Name (DSN) is composed of the following elements:
DSN prefix
The DSN prefix is odbc:. If you are connecting
to a database cataloged in the ODBC driver manager or the DB2 catalog,
you can append the cataloged name of the database to the DSN.
DSN
The name of the database as cataloged in the ODBC driver manager or
the DB2 catalog. Alternately, you can provide a complete ODBC
connection string to connect to a database as described at
» http://www.connectionstrings.com/.
UID
The name of the user for the connection. If you specify the user name
in the DSN, PDO ignores the value of the user name argument in the
PDO constructor.
PWD
The password of the user for the connection. If you specify the
password in the DSN, PDO ignores the value of the password argument
in the PDO constructor.
Examples
Example 1664. PDO_ODBC DSN example (ODBC driver manager)
The following example shows a PDO_ODBC DSN for connecting to
an ODBC database cataloged as testdb in the ODBC driver manager:
On MS SQL Server there is a convenient way to help troubleshooting database server performance problems is to use the APP attribute, like this:
<?php
$dsn = 'DRIVER=FreeTDS;SERVERNAME=server1;DATABASE=testdb;APP=My PHP Application;UID=user;';
?>
This will show the "My PHP Application" text in ProgramName column of the sp_who2 procedure in MS SQL Server.