mysqli_multi_query - 命令不同步；你现在不能运行这个命令 [英] mysqli_multi_query - Commands out of sync; you can't run this command now

问题描述

我有几个查询字符串，我想使用mysqli_multi_query"一次执行.这有效.

I have several query strings which I want to execute at once using "mysqli_multi_query". This works.

当我再次插入查询以使用mysqli_query"检查连接表中的每个项目时，它不会返回任何结果也来自 PHP 的任何错误.当我在 phpmyadmin 中手动运行查询字符串时，一切正常.

When I insert a query again to check each item in joined tables using "mysqli_query" it doesn't return any result nor any error from PHP. When I run the query string manually in phpmyadmin, everything works fine as it should.

这是我的代码:

<?php

$connect   = mysqli_connect('localhost','root','','database');
$strquery  = "";
$strquery .= "1st Query";
$strquyer .= "2nd Query";
if($multi = mysqli_multi_query($connect,$strquery)){   // function mysqli_multi_query is working
     // From here it doesn't give any response
     $qryarray = mysqli_query($connect, 
                              "SELECT purchase_detail_$_SESSION[period].item_code,
                                      purchase_detail_$_SESSION[period].location_code
                               FROM   purchase_detail_$_SESSION[period] 
                               WHERE  purchase_detail_$_SESSION[period].purchase_num = '$_POST[purchase_num]' 
                               UNION
                               SELECT purchase_detail_temp.item_code,
                                      purchase_detail_temp.location_code
                               FROM   purchase_detail_temp 
                               WHERE  purchase_detail_temp.purchase_num = '$_POST[purchase_num]' AND purchase_detail_temp.username = '$_SESSION[username]'");
     while($array = mysqli_fetch_array($qryarray)){
          "Some code to process several item code in table purchase_detail_$_SESSION[period]"
     }
}

我的代码有问题吗?

推荐答案

我刚刚在 PHP 手册:

注意:如果你混合使用 $mysqli->multi_query 和 $mysqli->query，后者不会被执行！

WATCH OUT: if you mix $mysqli->multi_query and $mysqli->query, the latter(s) won't be executed!

错误代码:

$mysqli->multi_query(" Many SQL queries ; "); // OK
$mysqli->query(" SQL statement #1 ; ") // not executed!
$mysqli->query(" SQL statement #2 ; ") // not executed!
$mysqli->query(" SQL statement #3 ; ") // not executed!
$mysqli->query(" SQL statement #4 ; ") // not executed!

正确执行此操作的唯一方法是:

The only way to do this correctly is:

工作代码:

$mysqli->multi_query(" Many SQL queries ; "); // OK
while ($mysqli->next_result()) {;} // flush multi_queries
$mysqli->query(" SQL statement #1 ; ") // now executed!
$mysqli->query(" SQL statement #2 ; ") // now executed!
$mysqli->query(" SQL statement #3 ; ") // now executed!
$mysqli->query(" SQL statement #4 ; ") // now executed!

我只是在mysqli_multi_query()之后插入这段代码:

I just insert this code after mysqli_multi_query():

while(mysqli_next_result($connect)){;}

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