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[2011-06-06 16:30 UTC] 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
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Last updated: Sun Nov 02 13:00:01 2025 UTC |
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'