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PDO::__construct

Creates a connection to a SQL Server database.


PDO::__construct($dsn [,$username [,$password [,$driver_options ]]] )

$dsn: A string that contains the prefix name (always sqlsrv), a colon, and the Server keyword. For example "sqlsrv:server=(local)". You can optionally specify other connection keywords. See Connection Options for a description of the Server keyword and the other connection keywords. The entire $dsn is in quotation marks, so each connection keyword should not be individually quoted.

$username: Optional. A string that contains the user's name. To connect using SQL Server Authentication, specify the login ID. To connect using Windows Authentication, specify "".

$password: Optional. A string that contains the user's password. To connect using SQL Server Authentication, specify the password. To connect using Windows Authentication, specify "".

$driver_options: Optional. You can specify PDO Driver Manager attributes, and Microsoft Drivers for PHP for SQL Server specific driver attributes -- PDO::SQLSRV_ATTR_ENCODING and PDO::SQLSRV_ATTR_DIRECT_QUERY. An invalid attribute will not generate an exception. Invalid attributes generate exceptions when specified with PDO::setAttribute.

Returns a PDO object. If failure, returns a PDOException object.

PDOException

You can close a connection object by setting the instance to null.

After a connection, PDO::errorCode will display 01000 instead of 00000.

If PDO::__construct fails for any reason, an exception will be thrown, even if PDO::ATTR_ERRMODE is set to PDO::ERRMODE_SILENT.

Support for PDO was added in version 2.0 of the Microsoft Drivers for PHP for SQL Server.

This example shows how to connect to a server using Windows Authentication, and specify a database.

<?php
   $c = new PDO( "sqlsrv:Server=(local) ; Database = AdventureWorks ", "", "", array(PDO::SQLSRV_ATTR_DIRECT_QUERY => true)); 

   $query = 'SELECT * FROM Person.ContactType'; 
   $stmt = $c->query( $query ); 
   while ( $row = $stmt->fetch( PDO::FETCH_ASSOC ) ) { 
      print_r( $row ); 
   }
   $c = null; 
?>

This example shows how to connect to a server, specifying the database later.

<?php
   $c = new PDO( "sqlsrv:server=(local)");

   $c->exec( "USE AdventureWorks");
   $query = 'SELECT * FROM Person.ContactType';
   $stmt = $c->query( $query );
   while ( $row = $stmt->fetch( PDO::FETCH_ASSOC ) ){
      print_r( $row );
   }
   $c = null;
?>

Reference

Other Resources

PDO

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