I have pleasure to work with legacy PHP application using SQL Server via PDO.
How in PHP can I retrieve return value of stored procedure which is using RETURN statement as output channel?
Example procedure
CREATE PROCEDURE [dbo].[mleko_test]
@param INT
AS
BEGIN
RETURN @param * 3;
END
GO
If possible, I would prefer to not modify procedure.
I am aware that there are similar questions, but they don't cover this case
Execute stored procedure like this: "exec ?=mleko_test(?)".
Working example:
<?php
#------------------------------
# Connection info
#------------------------------
$server = 'server\instance,port';
$database = 'database';
$uid = 'user';
$pwd = 'password';
#------------------------------
# With PDO
#------------------------------
try {
$conn = new PDO("sqlsrv:server=$server;Database=$database", $uid, $pwd);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch ( PDOException $e ) {
die ( "Error connecting to SQL Server" );
}
try {
$sql = "exec ? = mleko_test (?)";
$param = 3;
$spresult = 0;
$stmt = $conn->prepare($sql);
$stmt->bindParam(1, $spresult, PDO::PARAM_INT|PDO::PARAM_INPUT_OUTPUT, PDO::SQLSRV_PARAM_OUT_DEFAULT_SIZE);
$stmt->bindParam(2, $param);
$stmt->execute();
} catch ( PDOException $e ) {
die ( "Error connecting to SQL Server" );
}
$stmt = null;
$conn = null;
echo 'Stored procedure return value (with PDO): '.$spresult."</br>";
#------------------------------
# Without PDO
#------------------------------
$cinfo = array (
"Database" => $database,
"UID" => $uid,
"PWD" => $pwd
);
$conn = sqlsrv_connect($server, $cinfo);
if ( $conn === false )
{
echo "Error (sqlsrv_connect): ".print_r(sqlsrv_errors(), true);
exit;
}
$sql = "exec ? = mleko_test (?)";
$param = 3;
$spresult = 0;
$params = array(
array(&$spresult, SQLSRV_PARAM_OUT),
array($param, SQLSRV_PARAM_IN),
);
$stmt = sqlsrv_query($conn, $sql, $params);
if ( $stmt === false ) {
echo "Error (sqlsrv_query): ".print_r(sqlsrv_errors(), true);
exit;
}
while ($row = sqlsrv_fetch_array($stmt, SQLSRV_FETCH_ASSOC)) {
}
sqlsrv_free_stmt($stmt);
sqlsrv_close($conn);
echo 'Stored procedure return value (without PDO): '.$spresult."</br>";
?>
Notes:
Tested with PHP 7.1.12 and PHP Driver for SQL Server (pdo_sqlsrv version 4.3.0+9904).
length (3rd parameter to bindParam) is mandatory? I tried without it and it didn't worked.
I came to a solution using multi-query but @Zhorov answer is cleaner
<?php
$connection = new PDO($connectionString, $DB_USERNAME, $DB_PASSWORD);
$stmt = $connection->prepare(<<<SQL
DECLARE @a INT;
EXEC @a = mleko_test :in
SELECT @a AS result;
SQL
);
$stmt->execute([":in" => 123]);
echo $stmt->fetch()["result"] . "\n";
I had to change
$sql = "exec ?=mleko_test(?)";
for
$sql = "{?=call mleko_test(?)}";
