Mysqli 不允许多个查询?

问题描述

我正在 PHP 中运行一个脚本，该脚本使用循环为 MySQL 创建一个字符串查询.

I am running a script in PHP that uisng a loop creates a string query for MySQL.

执行脚本后出现以下错误:

After executing the script I get the following error:

您的 SQL 语法有错误；请查看手册对应于您的 MySQL 服务器版本以使用正确的语法'UPDATE BANNERS SET pos=1 WHERE BID=5; 附近更新横幅集pos=2 WHERE BID=1' 在第 2 行"

"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 'UPDATE BANNERS SET pos=1 WHERE BID=5; UPDATE BANNERS SET pos=2 WHERE BID=1' at line 2"

在错误之后我回显查询，它看起来像这样:

right after the error I echo the query and it looks like this:

UPDATE BANNERS SET pos=0 WHERE BID=6;
UPDATE BANNERS SET pos=1 WHERE BID=5;
UPDATE BANNERS SET pos=2 WHERE BID=1;

当我将其复制并粘贴到 phpmyadmin 中时，它显然可以毫无问题地执行.

When I copy and paste it into phpmyadmin, it obviously gets executed without any problem.

有什么想法吗?

这是PHP代码:

有一个看起来像这样的数组:

There is an array that looks like this:

$order[0] = 'tr_6';
$order[1] = 'tr_5';
$order[2] = 'tr_1';

$query = "";

foreach($order as $pos => $value){
   $idvalue = str_replace('tr_','',$value);
   $query .= "UPDATE BANNERS  SET pos=$pos WHERE BID=$idvalue;
";
}

mysqli_query($connection,$query) or die(mysqli_error($connection)."<br/>$query");

谢谢！

推荐答案

mysqli 允许使用 mysqli_multiple_query 函数进行多次查询，如下所示:

mysqli allow multiple queries with mysqli_multiple_query function like this:

$query  = "SELECT CURRENT_USER();";
$query .= "SELECT Name FROM City ORDER BY ID LIMIT 20, 5";

/* execute multi query */
if (mysqli_multi_query($link, $query)) {
    do {
        /* store first result set */
        if ($result = mysqli_store_result($link)) {
            while ($row = mysqli_fetch_row($result)) {
                printf("%s
", $row[0]);
            }
            mysqli_free_result($result);
        }
        /* print divider */
        if (mysqli_more_results($link)) {
            printf("-----------------
");
        }
    } while (mysqli_next_result($link));
}

请注意，每次查询后都需要使用分号.

note that you need to use semicolon after each query.

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