Bug #54221 [Opn->Asn]: mysqli::get_warnings segfault when used in multi queries

Edit report at http://bugs.php.net/bug.php?id=54221&edit=1 ID: 54221 Updated by: andrey@php.net Reported by: glen at delfi dot ee Summary: mysqli::get_warnings segfault when used in multi queries -Status: Open +Status: Assigned Type: Bug Package: MySQLi related PHP Version: 5.3.5 -Assigned To: +Assigned To: mysql Block user comment: N Private report: N New Comment: Reproduced Previous Comments: ------------------------------------------------------------------------ [2011-03-11 09:39:58] glen at delfi dot ee Description: ------------ http://php.net/manual/en/mysqli.get-warnings.php can't use mysqli::get_warnings with multi queries reliably as it will get either segfault or empty result. the code is supposed to print 2 times warning: "Warning: 1050: Table 'a' already exists" "Warning: 1050: Table 'a' already exists" but instead it segfaults (PHP 5.3.5). also if i run queries where only one warning is printed. it will not segfault. segfault seems to happen in ->next() call. seems is because internally this is implemented as "SHOW WARNINGS" query [1] [1] http://svn.php.net/viewvc/php/php- src/branches/PHP_5_3/ext/mysqli/mysqli_warning.c?annotate=306939#l76 segfault must be fixed, but regarding the usage, perhaps document that you can't use it sanely with multi queries, due limitations of mysql protocol, as seems it is problem in mysql protocol, that it returns warnings only from last of the multi query Test script: --------------- <?php $dbh = new mysqli(null, null, null, "test"); if ($dbh->connect_error) { die('Connect Error (' . $dbh->connect_errno . ') ' . $dbh->connect_error); } $create = "create temporary table if not exists a (a int4)"; $query = "$create;$create";$create;"; if ($dbh->multi_query($query)) { do { $sth = $dbh->store_result(); if ($dbh->warning_count) { $e = $dbh->get_warnings(); do { echo "Warning: $e->errno: $e->message\n"; } while ($e->next()); } } while ($dbh->next_result()); } ?> ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=54221&edit=1