ID: 45019 Updated by: [EMAIL PROTECTED] Reported By: pumuckel at metropolis dot de -Status: Verified +Status: Assigned Bug Type: MySQLi related Operating System: Linux Gentoo PHP Version: 5.3CVS-2008-05-16 (snap) Assigned To: andrey
Previous Comments: ------------------------------------------------------------------------ [2008-07-15 12:13:21] pumuckel at metropolis dot de Client API version: mysqlnd 5.0.4-dev - 080501 - $Revision: 1.3.2.15 With this version and this script we do not get segmentation fault. But I have another script where you won't get expected results: [...] $foo = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; $foo2 = "foo238964283467254725472725347254757652734522374628346246"; $stmt = $db->prepare("SELECT ? UNION SELECT ?"); $stmt->bind_param("ss", $foo, $foo2); $stmt->bind_result($bar); $stmt->execute(); $stmt->fetch(); // first to fetch "foo" echo("F1: $bar vs $foo (should be equal)\n"); $stmt->fetch(); // second to fetch $foo echo("F2: $bar vs $foo2 (should be equal)\n"); $stmt->free_result(); [...] Mike ------------------------------------------------------------------------ [2008-07-14 19:16:54] [EMAIL PROTECTED] This looks like a libmysql only issue. Pumuckel, if possible give mysqlnd a test with your code. ------------------------------------------------------------------------ [2008-07-14 18:17:47] [EMAIL PROTECTED] Verified - there are issues with UNION. I'll play with it. Andrey, wait for my test code. ------------------------------------------------------------------------ [2008-05-16 08:11:43] pumuckel at metropolis dot de Description: ------------ We experienced some strange behaviour when using "INSERT INTO ... select ? ... union select ? ..." Some bound variables have been inserted, but were truncated somewhere within the strings. We have created a simple test script which only selects and returns the contents we bound. With "SELECT ? UNION SELECT ?" and 2 bound variables we can see, that the contents of the variables are not the same when reading back from db. With the code below we even managed to get a segmentation fault. Reproduce code: --------------- <?php $db = new mysqli($hostname, $username, $password, $dbname); $foo = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; $foo2 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; $stmt = $db->prepare("SELECT CAST('x' as CHAR) X UNION SELECT CAST(? AS CHAR(20)) UNION SELECT CAST(? as CHAR(50))"); $stmt->bind_param("ss", $foo, $foo2); $stmt->bind_result($bar); $stmt->execute(); $stmt->fetch(); // first to fetch "foo" echo("F1: $bar vs $foo (".strlen($bar)." vs. ".strlen($foo).")\n"); $stmt->fetch(); // second to fetch $foo echo("F2: $bar vs $foo (".strlen($bar)." vs. ".strlen($foo).")\n"); $stmt->fetch(); // second to fetch casted $foo echo("F3: $bar vs $foo2 (".strlen($bar)." vs. ".strlen($foo2).")\n"); $stmt->free_result(); ?> Expected result: ---------------- Returned variable $bar should contain contents of 'x', $foo, $foo2: F1: x vs 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ (1 vs. 36) F2: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ vs 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ (36 vs. 36) F3: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ vs 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ (36 vs. 36) Actual result: -------------- F1: x vs 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ (1 vs. 36) F2: 0123 vs 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ (4 vs. 36) Segmentation fault With gdb: F1: x vs 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ (1 vs. 36) F2: 0123 vs 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ (4 vs. 36) Program received signal SIGSEGV, Segmentation fault. mysqli_stmt_fetch_libmysql (ht=0, return_value=0x86f9288, return_value_ptr=0x0, this_ptr=0x86f8fb8, return_value_used=0) at /usr/local/src/php5.3-200805151430/ext/mysqli/mysqli_api.c:837 837 if (Z_TYPE_P(stmt->result.vars[i]) == IS_STRING) { (gdb) where #0 mysqli_stmt_fetch_libmysql (ht=0, return_value=0x86f9288, return_value_ptr=0x0, this_ptr=0x86f8fb8, return_value_used=0) at /usr/local/src/php5.3-200805151430/ext/mysqli/mysqli_api.c:837 #1 0x082e92bd in zend_do_fcall_common_helper_SPEC (execute_data=0x8729f38) at /usr/local/src/php5.3-200805151430/Zend/zend_vm_execute.h:194 #2 0x082daa77 in execute (op_array=0x86f843c) at /usr/local/src/php5.3-200805151430/Zend/zend_vm_execute.h:96 #3 0x082ba797 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /usr/local/src/php5.3-200805151430/Zend/zend.c:1195 #4 0x0826ad8c in php_execute_script (primary_file=0xbfd034f4) at /usr/local/src/php5.3-200805151430/main/main.c:2077 #5 0x083437f6 in main (argc=2, argv=0xbfd03684) at /usr/local/src/php5.3-200805151430/sapi/cli/php_cli.c:1139 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=45019&edit=1