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How to: Disable Multiple Active Resultsets (MARS)

SQL Server 2008 R2

If you need to connect to a SQL Server data source that does not enable Multiple Active Result Sets (MARS), you can use the MultipleActiveResultSets connection option to disable or enable MARS.

To disable MARS support

  • Use the following connection option:

    'MultipleActiveResultSets'=>false
    

    If your application attempts to execute a query on a connection that has an open active result set, the second query attempt will return the following error information:

    The connection cannot process this operation because there is a statement with pending results. To make the connection available for other queries either fetch all results, cancel or free the statement. For more information about the MultipleActiveResultSets connection option, see Connection Options.

The following example shows how to disable MARS support, using the SQLSRV driver of the Microsoft Drivers for PHP for SQL Server.

<?php
/* Connect to the local server using Windows Authentication and
specify the AdventureWorks database as the database in use. */
$serverName = "MyServer";
$connectionInfo = array( "Database"=>"AdventureWorks", 'MultipleActiveResultSets'=> false);
$conn = sqlsrv_connect( $serverName, $connectionInfo);
if( $conn === false )
{
   echo "Could not connect.\n";
   die( print_r( sqlsrv_errors(), true));
}

sqlsrv_close( $conn);
?>

The following example shows how to disable MARS support, using the PDO_SQLSRV driver of the Microsoft Drivers for PHP for SQL Server.

<?php
// Connect to the local server using Windows Authentication and AdventureWorks database
$serverName = "(local)"; 
$database = "AdventureWorks";

try {
   $conn = new PDO(" sqlsrv:server=$serverName ; Database=$database ; MultipleActiveResultSets=false ", NULL, NULL); 
   $conn->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION ); 
}

catch( PDOException $e ) {
   die( "Error connecting to SQL Server" ); 
}

$conn = null; 
?>

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