#39213 [NEW]: NULL == '' in mssql extention

From: frediano dot ziglio at vodafone dot com Operating system: Linux PHP version: 5.1.6 PHP Bug Type: MSSQL related Bug description: NULL == '' in mssql extention Description: ------------ when you get data you assume NULL if dbdatlen == 0 however is possible that data is just an empty string (''), in this case you should check that dbdatlen == 0 and dbdata == NULL. Reproduce code: --------------- I use this test script (pwd.inc define just variable to connect) <?php // $Id: null.php,v 1.2 2006/10/20 14:38:22 freddy77 Exp $ require_once("pwd.inc"); $conn = mssql_connect($server,$user,$pass) or die("opps"); mssql_query("CREATE TABLE #MyTable ( myfield VARCHAR(10) NULL, n INT )", $conn) or die("error querying"); mssql_query("INSERT INTO #MyTable VALUES('',1) INSERT INTO #MyTable VALUES(NULL,2) INSERT INTO #MyTable VALUES(' ',3) INSERT INTO #MyTable VALUES('a',4)", $conn) or die("error querying"); $result = 0; function test($sql, $expected) { global $conn, $result; $res = mssql_query($sql, $conn) or die("query"); $row = mssql_fetch_assoc($res); $s = $row['myfield']; if (is_null($s)) $s = '(NULL)'; else if ($s == '') $s = '(Empty String)'; else $s = "'".str_replace("'", "''", $s)."'"; echo "$sql -> $s\n"; if ($s != $expected) { echo "error!\n"; $result = 1; } } test("SELECT top 1 * FROM #MyTable WHERE n = 1 -- ''", "(Empty String)"); test("SELECT top 1 * FROM #MyTable WHERE n = 2 -- NULL", "(NULL)"); test("SELECT top 1 * FROM #MyTable WHERE n = 3 -- ' '", "' '"); test("SELECT top 1 * FROM #MyTable WHERE n = 4 -- 'a'", "'a'"); exit($result); ?> Expected result: ---------------- SELECT top 1 * FROM #MyTable WHERE n = 1 -- '' -> (Empty String) SELECT top 1 * FROM #MyTable WHERE n = 2 -- NULL -> (NULL) SELECT top 1 * FROM #MyTable WHERE n = 3 -- ' ' -> ' ' SELECT top 1 * FROM #MyTable WHERE n = 4 -- 'a' -> 'a' Actual result: -------------- SELECT top 1 * FROM #MyTable WHERE n = 1 -- '' -> (NULL) error! SELECT top 1 * FROM #MyTable WHERE n = 2 -- NULL -> (NULL) SELECT top 1 * FROM #MyTable WHERE n = 3 -- ' ' -> ' ' SELECT top 1 * FROM #MyTable WHERE n = 4 -- 'a' -> 'a' -- Edit bug report at http://bugs.php.net/?id=39213&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=39213&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=39213&r=trysnapshot52 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=39213&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=39213&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=39213&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=39213&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=39213&r=needscript Try newer version: http://bugs.php.net/fix.php?id=39213&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=39213&r=support Expected behavior: http://bugs.php.net/fix.php?id=39213&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=39213&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=39213&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=39213&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=39213&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=39213&r=dst IIS Stability: http://bugs.php.net/fix.php?id=39213&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=39213&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=39213&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=39213&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=39213&r=mysqlcfg