Edit report at https://bugs.php.net/bug.php?id=55001&edit=1
ID: 55001
Updated by: uw@php.net
Reported by: enrico dot triolo at gmail dot com
Summary: Mysql explain command with prepared statement
-Status: Assigned
+Status: Bogus
Type: Bug
Package: MySQLi related
Operating System: Ubuntu 11.04
PHP Version: Irrelevant
Assigned To: mysql
Block user comment: N
Private report: N
New Comment:
Works fine with mysqlnd. That's a libmysql issue. Use mysqlnd instead. Because it works with
mysqlnd, its not a mysqli issue either.
Setting to "Bogus" as bugs.php.net is not for libmysql bug reports. Please, report over at
bugs.mysql.com.
-------------- script ------------------------------------------------------
nixnutz@linux-fuxh:~/php/php-src/branches/PHP_5_4> cat foo.php
<?php
$sql = 'explain SELECT id FROM mytest_table WHERE idParent <> -1 AND idParent NOT IN (
SELECT id FROM mytest_table)';
$link = mysqli_connect("localhost", 'root', '', 'test');
$link->query("DROP TABLE IF EXISTS mytest_table");
$link->query("CREATE TABLE mytest_table(id INT PRIMARY KEY NOT NULL, idParent INT)");
$link->query("INSERT INTO mytest_table(id, idParent) VALUES (1, -1), (2, 1)");
printf("Using prepared statement functions...\n");
$stmt = mysqli_stmt_init($link);
mysqli_stmt_prepare($stmt, $sql);
mysqli_stmt_execute($stmt);
mysqli_stmt_store_result($stmt);
$result = mysqli_stmt_result_metadata($stmt);
printf("Fields:\n");
while($field = mysqli_fetch_field($result))
printf("\t%s(%d)\n", $field->name, $field->length);
mysqli_free_result($result);
mysqli_stmt_bind_result($stmt, $id, $select_type, $table, $type, $possible_keys, $key, $key_len,
$ref, $rows, $extra);
while(mysqli_stmt_fetch($stmt))
printf("Type field value: %s\n", $type);
printf("\nUsing mysqli_query...\n");
$result = mysqli_query($link, $sql);
while($row = mysqli_fetch_array($result))
printf("Type field value: %s\n", $row['type']);
mysqli_free_result($result);
mysqli_close($link);
-------------------------- libmysql -------------------------------------
nixnutz@linux-fuxh:~/php/php-src/branches/PHP_5_4> sapi/cli/php -i | grep mysql
Configure Command => './configure'
'--with-mysql=/home/nixnutz/ftp/mysql-5.6.2-m5/install'
'--with-mysqli=/home/nixnutz/ftp/mysql-5.6.2-m5/install/bin/mysql_config'
'--with-pdo-mysql=/home/nixnutz/ftp/mysql-5.6.2-m5/install/bin/mysql_config'
'--enable-debug' '--with-openssl' '--enable-pcntl'
nixnutz@linux-fuxh:~/php/php-src/branches/PHP_5_4> sapi/cli/php foo.php
Using prepared statement functions...
Fields:
id(3)
select_type(19)
table(64)
type(10)
possible_keys(4096)
key(64)
key_len(4096)
ref(1024)
rows(10)
Extra(255)
Type field value: ALL
Type field value: unique_subq
Using mysqli_query...
Type field value: ALL
Type field value: unique_subquery
-------------------- mysqlnd ----------------------------
nixnutz@linux-fuxh:~/php/php-src/trunk> sapi/cli/php foo.php
Using prepared statement functions...
Fields:
id(3)
select_type(19)
table(64)
type(10)
possible_keys(4096)
key(64)
key_len(4096)
ref(1024)
rows(10)
Extra(255)
Type field value: ALL
Type field value: unique_subquery
Using mysqli_query...
Type field value: ALL
Type field value: unique_subquery
nixnutz@linux-fuxh:~/php/php-src/trunk> sapi/cli/php -i | grep mysqlnd
Configure Command => './configure' '--with-mysql=mysqlnd'
'--with-mysqli=mysqlnd' '--with-pdo-mysql=mysqlnd' '--enable-debug'
'--enable-maintainer-zts' '--enable-pcntl'
Previous Comments:
------------------------------------------------------------------------
[2011-06-08 08:48:20] enrico dot triolo at gmail dot com
I'm using libmysql.
Here's the output of the "php --ri mysqli" command:
$php --ri mysqli
mysqli
MysqlI Support => enabled
Client API library version => 5.1.54
Active Persistent Links => 0
Inactive Persistent Links => 0
Active Links => 0
Client API header version => 5.1.54
MYSQLI_SOCKET => /var/run/mysqld/mysqld.sock
Directive => Local Value => Master Value
mysqli.max_links => Unlimited => Unlimited
mysqli.max_persistent => Unlimited => Unlimited
mysqli.allow_persistent => On => On
mysqli.default_host => no value => no value
mysqli.default_user => no value => no value
mysqli.default_pw => no value => no value
mysqli.default_port => 3306 => 3306
mysqli.default_socket => no value => no value
mysqli.reconnect => Off => Off
mysqli.allow_local_infile => On => On
------------------------------------------------------------------------
[2011-06-08 02:17:22] johannes@php.net
Are you using mysqlnd or libmysql. If libmysql which version? (check phpinfo() output or php
--ri mysqli from command line)
------------------------------------------------------------------------
[2011-06-06 16:30:24] enrico dot triolo at gmail dot com
Description:
------------
Hi, I found out an anomaly executing an "explain" command using prepared
statements functions. Using "standard" functions works as expected.
In short, if I execute an "explain" on a query with a subquery and fetch the
resulting "type" field, I get "unique_subq" instead of
"unique_subquery".
Please view the attached code snippet.
I'm using PHP 5.3.5-1ubuntu7.2, but other versions have the same behaviour too.
The attached script uses a table created with this instruction:
CREATE TABLE IF NOT EXISTS mytest_table (
id int(11) NOT NULL AUTO_INCREMENT,
idParent int(11) NOT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
Test script:
---------------
$sql = 'explain SELECT id FROM mytest_table WHERE idParent <> -1 AND idParent NOT IN (
SELECT id FROM mytest_table)';
$link = mysqli_connect("localhost", 'user', 'password',
'dbName');
printf("Using prepared statement functions...\n");
$stmt = mysqli_stmt_init($link);
mysqli_stmt_prepare($stmt, $sql);
mysqli_stmt_execute($stmt);
mysqli_stmt_store_result($stmt);
$result = mysqli_stmt_result_metadata($stmt);
printf("Fields:\n");
while($field = mysqli_fetch_field($result))
printf("\t%s(%d)\n", $field->name, $field->length);
mysqli_free_result($result);
mysqli_stmt_bind_result($stmt, $id, $select_type, $table, $type, $possible_keys, $key, $key_len,
$ref, $rows, $extra);
while(mysqli_stmt_fetch($stmt))
printf("Type field value: %s\n", $type);
printf("\nUsing mysqli_query...\n");
$result = mysqli_query($link, $sql);
while($row = mysqli_fetch_array($result))
printf("Type field value: %s\n", $row['type']);
mysqli_free_result($result);
mysqli_close($link);
Expected result:
----------------
Using prepared statement functions I'd expect the second row value for the "type"
field being "unique_subquery".
Actual result:
--------------
I get "unique_subq" instead of "unique_subquery". Using mysqli_query (i.e.
without prepared statement functions), I get the expected result:
Using prepared statement functions...
...
Type field value: unique_subq
Using mysqli_query...
...
Type field value: unique_subquery
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=55001&edit=1