#49961 [NoF->Bgs]: Value of "length" column for fetch_fields() is incorrect.

ID: 49961 Updated by: uw@php.net Reported By: aavolkoff at gmail dot com -Status: No Feedback +Status: Bogus Bug Type: MySQLi related Operating System: Linux l9.in-solve.ru 2.6.26-r9-s PHP Version: 5.2.11 New Comment: Ah, now I get what is puzzling you: 200 -> 600, sorry missed that on the first glance. Not a bug, length is length in bytes. UTF8 uses 3 bytes per character, 200 * 3 = 600. From the underlying C API documentation: The width of the field. This corresponds to the display length, in bytes. The server determines the length value before it generates the result set, so this is the minimum length required for a data type capable of holding the largest possible value from the result column, without knowing in advance the actual values that will be produced by the query for the result set. Previous Comments: ------------------------------------------------------------------------ [2009-10-31 01:00:01] php-bugs at lists dot php dot net No feedback was provided for this bug for over a week, so it is being suspended automatically. If you are able to provide the information that was originally requested, please do so and change the status of the bug back to "Open". ------------------------------------------------------------------------ [2009-10-23 20:21:11] aavolkoff at gmail dot com MySQL charset: UTF-8 Unicode (utf8) <? $mysqli = new mysqli("localhost", "root", ""); if (mysqli_connect_errno()) return false; $db_name = "local"; $query = "CREATE DATABASE $db_name"; $mysqli->real_query($query); $mysqli->select_db($db_name); $table_name = "Users"; $query = "CREATE TABLE ".$table_name."(id int not null auto_increment, name varchar(200), description varchar(200), primary key (id)) TYPE=MyISAM"; $mysqli->real_query($query); $query = "SELECT * FROM $table_name LIMIT 0"; $query_result = $mysqli->real_query($query); if ($query_result) { $mysqli_result = $mysqli->use_result(); $mysqli_fields = $mysqli_result->fetch_fields(); $mysqli_result->free_result(); print_r($mysqli_fields); } ?> ------------------------------------------------------------------------ [2009-10-23 07:18:21] uw@php.net Thank you for this bug report. To properly diagnose the problem, we need a short but complete example script to be able to reproduce this bug ourselves. A proper reproducing script starts with <?php and ends with ?>, is max. 10-20 lines long and does not require any external resources such as databases, etc. If the script requires a database to demonstrate the issue, please make sure it creates all necessary tables, stored procedures etc. Please avoid embedding huge scripts into the report. What is needed is all the character sets: MySQL server, client etc. ------------------------------------------------------------------------ [2009-10-23 07:17:16] uw@php.net Sounds bogus. The mysql extensions in 5.2 forward 1 by 1 what the C API = Mysql returns. The multiplier of 3 hints that a 3-byte charset gets used in one case and a 1-byte charset in the other Without information on the character sets used, this cannot be verified. You need to provide character set information ------------------------------------------------------------------------ [2009-10-22 18:02:12] aavolkoff at gmail dot com Description: ------------ Value of "length" column for fetch_fields() is incorrect. eg: MySQL version: 5.0.37 Reproduce code: --------------- I have table "Users": name = "id"; type = "INT"; length = 11. name = "name"; type = "VARCHAR"; length = 200. name = "description"; type = "VARCHAR"; length = 200. Code: //$mysqli defined earlier $query = "SELECT * FROM Users LIMIT 0"; $query_result = $mysqli->real_query($query); if ($query_result) { $mysqli_result = $mysqli->use_result(); $mysqli_fields = $mysqli_result->fetch_fields(); $mysqli_result->free_result(); print_r($mysqli_fields); } Expected result: ---------------- Array ( [0] => stdClass Object ( [name] => id [orgname] => id [table] => Users [orgtable] => Users [def] => [max_length] => 0 [length] => 11 [charsetnr] => 63 [flags] => 49667 [type] => 3 [decimals] => 0 ) [1] => stdClass Object ( [name] => name [orgname] => name [table] => Users [orgtable] => Users [def] => [max_length] => 0 [length] => 200 [charsetnr] => 33 [flags] => 0 [type] => 253 [decimals] => 0 ) [2] => stdClass Object ( [name] => description [orgname] => description [table] => Users [orgtable] => Users [def] => [max_length] => 0 [length] => 200 [charsetnr] => 33 [flags] => 0 [type] => 253 [decimals] => 0 ) ) Actual result: -------------- Array ( [0] => stdClass Object ( [name] => id [orgname] => id [table] => Users [orgtable] => Users [def] => [max_length] => 0 [length] => 11 [charsetnr] => 63 [flags] => 49667 [type] => 3 [decimals] => 0 ) [1] => stdClass Object ( [name] => name [orgname] => name [table] => Users [orgtable] => Users [def] => [max_length] => 0 [length] => 600 [charsetnr] => 33 [flags] => 0 [type] => 253 [decimals] => 0 ) [2] => stdClass Object ( [name] => description [orgname] => description [table] => Users [orgtable] => Users [def] => [max_length] => 0 [length] => 600 [charsetnr] => 33 [flags] => 0 [type] => 253 [decimals] => 0 ) ) Parameter "length" of array elements is incorrect (600, but not 200). When I change length in PhpMyAdmin to 150 code "says" that length is 450. When I change length in PhpMyAdmin to 1 code "says" that length is 3. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=49961&edit=1