PHP MYSQL Error when calling multiple Stored Proce

问题:

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?

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

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

I'm running on windows

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
}

回答1:

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();
        ?>

回答2:

if you are calling more then one procedure in a single script page, you should call mysqli_next_result($connection_link) before calling another procedure. consider below sample code block: