php - 特定查询语法在php mysqli中无效，但在MySQL CLI中无效。

当我尝试在PHP MySQL I中执行它时，这个查询会给出语法错误，但在MySQL CLI中执行时不会。有人能告诉我这里发生了什么吗。
以下是问题：

DROP TABLE IF EXISTS `wp_commentmeta`;
    CREATE TABLE `wp_commentmeta` (
      `meta_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
      `comment_id` bigint(20) unsigned NOT NULL DEFAULT '0',
      `meta_key` varchar(255) DEFAULT NULL,
      `meta_value` longtext,
      PRIMARY KEY (`meta_id`),
      KEY `comment_id` (`comment_id`),
      KEY `meta_key` (`meta_key`)
    ) ENGINE=MyISAM DEFAULT CHARSET=latin1;

下面是测试代码：

<?php

$sql="
    DROP TABLE IF EXISTS `wp_commentmeta`;
    CREATE TABLE `wp_commentmeta` (
      `meta_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
      `comment_id` bigint(20) unsigned NOT NULL DEFAULT '0',
      `meta_key` varchar(255) DEFAULT NULL,
      `meta_value` longtext,
      PRIMARY KEY (`meta_id`),
      KEY `comment_id` (`comment_id`),
      KEY `meta_key` (`meta_key`)
    ) ENGINE=MyISAM DEFAULT CHARSET=latin1;
";

$conn=mysqli_connect('localhost','root','yesthereis','test');
if(mysqli_query($conn, $sql)){
    echo "Inserted\n";
}else{
    echo "Failed\n".mysqli_error($conn)."\n";
}
?>

……这就是执行：

jgalley@jgalley-debian:~/code/$ php test.php
Failed
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'CREATE TABLE `wp_commentmeta` (
      `meta_id` bigint(20) unsigned NOT NULL AUT' at line 2

如您所见，它在CLI中运行良好：

jgalley@jgalley-debian:~/code/mysqlsync2$ mysql -u root -p'yesthereis' test
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 213
Server version: 5.1.63-0+squeeze1 (Debian)

Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> DROP TABLE IF EXISTS `wp_commentmeta`;
Query OK, 0 rows affected, 1 warning (0.05 sec)

mysql>     CREATE TABLE `wp_commentmeta` (
    ->       `meta_id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
    ->       `comment_id` bigint(20) unsigned NOT NULL DEFAULT '0',
    ->       `meta_key` varchar(255) DEFAULT NULL,
    ->       `meta_value` longtext,
    ->       PRIMARY KEY (`meta_id`),
    ->       KEY `comment_id` (`comment_id`),
    ->       KEY `meta_key` (`meta_key`)
    ->     ) ENGINE=MyISAM DEFAULT CHARSET=latin1;
Query OK, 0 rows affected (0.01 sec)

mysql> quit
Bye

最佳答案

不能在一个mysqli_query调用中运行两个查询。将查询字符串一分为二并分别执行它们。（或者，正如视频在评论中正确指出的那样，使用mysqli_multi_query作为脚本中mysqli_query的替换项。）
这有助于减少SQL注入。

关于php - 特定查询语法在php mysqli中无效，但在MySQL CLI中无效。，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/13964316/