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How to: Retrieve Output Parameters Using the SQLSRV Driver

This topic demonstrates how to call a stored procedure in which one parameter has been defined as an output parameter. Note that when retrieving an output or input/output parameter, all results returned by the stored procedure must be consumed before the returned parameter value is accessible.

Note Note

Variables that are initialized or updated to null, DateTime, or stream types cannot be used as output parameters.

Data truncation can occur when stream types such as SQLSRV_SQLTYPE_VARCHAR('max') are used as output parameters. Stream types are not supported as output parameters. For non-stream types, data truncation can occur if the length of the output parameter is not specified or if the specified length is not sufficiently large for the output parameter.

The following example calls a stored procedure that returns the year-to-date sales by a specified employee. The PHP variable $lastName is an input parameter and $salesYTD is an output parameter.

Note Note

Initializing $salesYTD to 0.0 sets the returned PHPTYPE to float. To ensure data type integrity, output parameters should be initialized before calling the stored procedure, or the desired PHPTYPE should be specified. For information about specifying the PHPTYPE, see How to: Specify PHP Data Types.

Because only one result is returned by the stored procedure, $salesYTD contains the returned value of the output parameter immediately after the stored procedure is executed.

Note Note

Calling stored procedures using canonical syntax is the recommended practice. For more information about canonical syntax, see Calling a Stored Procedure.

The example assumes that SQL Server and the AdventureWorks database are installed on the local computer. All output is written to the console when the example is run from the command line.

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

/* Drop the stored procedure if it already exists. */
$tsql_dropSP = "IF OBJECT_ID('GetEmployeeSalesYTD', 'P') IS NOT NULL
                DROP PROCEDURE GetEmployeeSalesYTD";
$stmt1 = sqlsrv_query( $conn, $tsql_dropSP);
if( $stmt1 === false )
{
     echo "Error in executing statement 1.\n";
     die( print_r( sqlsrv_errors(), true));
}

/* Create the stored procedure. */
$tsql_createSP = " CREATE PROCEDURE GetEmployeeSalesYTD
                   @SalesPerson nvarchar(50),
                   @SalesYTD money OUTPUT
                   AS
                   SELECT @SalesYTD = SalesYTD
                   FROM Sales.SalesPerson AS sp
                   JOIN HumanResources.vEmployee AS e 
                   ON e.EmployeeID = sp.SalesPersonID
                   WHERE LastName = @SalesPerson";
$stmt2 = sqlsrv_query( $conn, $tsql_createSP);
if( $stmt2 === false )
{
     echo "Error in executing statement 2.\n";
     die( print_r( sqlsrv_errors(), true));
}

/*--------- The next few steps call the stored procedure. ---------*/

/* Define the Transact-SQL query. Use question marks (?) in place of
 the parameters to be passed to the stored procedure */
$tsql_callSP = "{call GetEmployeeSalesYTD( ?, ? )}";

/* Define the parameter array. By default, the first parameter is an
INPUT parameter. The second parameter is specified as an OUTPUT
parameter. Initializing $salesYTD to 0.0 sets the returned PHPTYPE to
float. To ensure data type integrity, output parameters should be
initialized before calling the stored procedure, or the desired
PHPTYPE should be specified in the $params array.*/
$lastName = "Blythe";
$salesYTD = 0.0;
$params = array( 
                 array($lastName, SQLSRV_PARAM_IN),
                 array($salesYTD, SQLSRV_PARAM_OUT)
               );

/* Execute the query. */
$stmt3 = sqlsrv_query( $conn, $tsql_callSP, $params);
if( $stmt3 === false )
{
     echo "Error in executing statement 3.\n";
     die( print_r( sqlsrv_errors(), true));
}

/* Display the value of the output parameter $salesYTD. */
echo "YTD sales for ".$lastName." are ". $salesYTD. ".";

/*Free the statement and connection resources. */
sqlsrv_free_stmt( $stmt1);
sqlsrv_free_stmt( $stmt2);
sqlsrv_free_stmt( $stmt3);
sqlsrv_close( $conn);
?>

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