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[2006-01-09 00:26 UTC] victoria at balic dot net
Description:
------------
I created a trivial stored procedure in MySQL (v5.0.17) that simply returns an integer constant. If I call the procedure using a PDO statement and binding a return value $stmt->bindParam(), I get nothing.
On the other hand, if I issue two SQL queries to implicitly obtain the result, things are ok (see below). So something is broken with the way PDO handles bindParam.
I am using the latest stable release of PHP (5.1.1), MySQL 5.0.17 and mod_php for Apache 2.2
Reproduce code:
---------------
<?php
$DB = new PDO(...);
if($DB != NULL) {
$stmt = $DB->prepare(" CALL test_pdo(?)");
$stmt->bindParam(1, $return_value, PDO::PARAM_INT, 10);
$stmt->execute();
print "Procedure returned: $return_value \n";
//try instead plain SQL call
$DB->query("CALL test_pdo(@nn)");
$rows = $DB->query("SELECT @nn")->fetchAll();
print "SELECT returned: \n";
print_r($rows);
}
?>
And here's actual MySQL Stored procedure:
CREATE PROCEDURE test_pdo
(OUT Pout INTEGER)
BEGIN
SET Pout := 1912;
END
Expected result:
----------------
$return_value should have been set to "1912" and instead it's empty. The stored procedure is working ok as the second call (in which i implicitly obtain the output by making two SQL queries) returns the correct value (see below).
Actual result:
--------------
Procedure returned:
SELECT returned:
Array ( [0] => Array ( [@nn] => 1912 [0] => 1912 ) )
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Last updated: Wed Oct 29 07:00:01 2025 UTC |
I am experiencing the same issue on Windows and MSSQL. Stored Procedure Create Code: ****************************************** CREATE PROCEDURE [dbo].[p_sel_all_termlength] @err INT = 0 OUTPUT AS SELECT * FROM termlength SET @err = 2627 ****************************************** PHP Code: ****************************************** $Link = new PDO('mssql:host=sqlserver;dbname=database', 'username', 'password'); $ErrorCode = 0; $Stmt = $Link->prepare('p_sel_all_termlength ?'); $Stmt->bindParam(1,$ErrorCode,PDO::PARAM_INT,4); $Stmt->execute(); echo "Error = " . $ErrorCode . "\n"; while ($Row = $Stmt->fetch(PDO::FETCH_OBJ)) { echo $Row->description . "\n"; } echo "Error = " . $ErrorCode . "\n"; ****************************************** PHP Output: ****************************************** Error = 0 9 Weeks Semester One Year Trimester Error = 0 ******************************************MySQL doesn't supporting binding output parameters via its C API. You must use SQL level variables: $stmt = $db->prepare("CALL sp_returns_string(@a)"); $stmt->execute(); print_r($db->query("SELECT @a")->fetchAll());