调用多个存储过程时，PHP MYSQL错误 [英] PHP MYSQL Error when calling multiple Stored Procedures

问题描述

当我在页面中多次调用一个过程时，我很难调用和显示内容.我试图显示来自两个不同SP的MYSQL调用的两个单独的记录集.我可以显示第一个电话，但第二个电话失败.我不确定自己在做什么错，但也许有人可以帮忙?

I am having difficulty calling and displaying the content when I call a procedure more than once in a page. I am trying to display two separate record sets from two different SP calls for MYSQL. I can display the first call but the second fails. I'm not sure what I am doing wrong but perhaps someone can kind help?

调用第二个过程时，我不断收到错误消息:

I keep getting the error when I call the second procedure:

Error calling SPCommands out of sync; you can't run this command now

我正在Windows上运行

I'm running on windows

下面的代码... PHP

Code below... PHP

// First call to SP
$page = 2;
$section = 1;

include("DatabaseConnection.php"); //general connection - works fine

$sql = 'CALL GetPageContent("'.$page.'", "'.$section.'")';

$result = mysqli_query($conn, $sql) or die('Error calling SP' .mysqli_error($conn));

while($row=mysqli_fetch_assoc($result))
{
   // DO STUFF< REMOVED TO MAKE READING CLEARER
}

mysqli_free_result($result);

//SECOND CALL BELOW


$section = 2; // change parameter for different results

$sql = 'CALL GetPageContent("'.$page.'", "'.$section.'")';

$result = mysqli_query($conn, $sql) or die('Error calling SP' .mysqli_error($conn));


while($row=mysql_fetch_assoc($result))
{
   // DO STUFF< REMOVED TO MAKE READING CLEARER
}

推荐答案

要解决此问题，请记住在每次存储过程调用之后在mysqli对象上调用next_result()函数.请参见下面的示例:

To fix the problem, remember to call the next_result() function on the mysqli object after each stored procedure call. See example below:

        <?php
        // New Connection
        $db = new mysqli('localhost','user','pass','database');

        // Check for errors
        if(mysqli_connect_errno()){
         echo mysqli_connect_error();
        }

        // 1st Query
        $result = $db->query("call getUsers()");
        if($result){
             // Cycle through results
            while ($row = $result->fetch_object()){
                $user_arr[] = $row;
            }
            // Free result set
            $result->close();
            $db->next_result();
        }

        // 2nd Query
        $result = $db->query("call getGroups()");
        if($result){
             // Cycle through results
            while ($row = $result->fetch_object()){
                $group_arr[] = $row;
            }
             // Free result set
             $result->close();
             $db->next_result();
        }
        else echo($db->error);

        // Close connection
        $db->close();
        ?>

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