Bug #54169 [Opn->Asn]: Garbage Pointers returned for (n)varchar(max) columns (SQL Server)

Edit report at http://bugs.php.net/bug.php?id=54169&edit=1 ID: 54169 Updated by: felipe@php.net Reported by: auroraeosrose@php.net Summary: Garbage Pointers returned for (n)varchar(max) columns (SQL Server) -Status: Open +Status: Assigned Type: Bug Package: PDO related Operating System: Any PHP Version: Irrelevant -Assigned To: +Assigned To: auroraeosrose Block user comment: N Private report: N Previous Comments: ------------------------------------------------------------------------ [2011-03-05 17:06:22] auroraeosrose@php.net Description: ------------ I found an issue this week that exists in both odbc and pdo_odbc with SQL Server. The ODBC implemention of Windows returns 0 as the length for for varchar(max) and nvarchar(max). This makes the allocation of the strings incorrect and you get back garbage pointers for the contents. This was a pretty easy fix for pdo_odbc, simply check if the colsize is returned as 0 and the type is one of the varchar types, if so always treat it as a column with "long" data. This works perfectly without breaking things. Attached is a patch that works for both 5.3 and trunk, includes an additional test for the issue. ODBC shows the same issue - don't have a fix for that Occurs in all versions of PHP There are multiple bug reports concerning this and related to it - I'll try to gather them all up (later) Test script: --------------- $db = new PDO('odbc:yourdsnhere', 'username', 'password'); $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $db->exec('CREATE TABLE testing(id INT NOT NULL PRIMARY KEY, data varchar(max))'); $insert = $db->prepare('INSERT INTO testing VALUES (?, ?)'); $insert->execute(array(1, str_repeat('i', 500))); $stmt = $db->query('select * from testing'); var_dump($stmt->fetchAll()); unset($db, $insert, $smt); // This shows the same issue in odbc $db = odbc_connect ('yourdsnhere', 'username', 'password'); $stmt = odbc_exec($db, 'select * from testing'); var_dump(odbc_fetch_array($stmt)); Expected result: ---------------- array(1) { [0]=> array(4) { ["id"]=> string(1) "1" [0]=> string(1) "1" ["data"]=> string(500) "iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii" [1]=> string(500) "iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii" } } Same for the odbc call Actual result: -------------- array(1) { [0]=> array(4) { ["id"]=> string(1) "1" [0]=> string(1) "1" ["data"]=> string(500) "�-\
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