調用多個存儲過程時PHP MYSQL錯誤

Question

當我在頁面中多次調用一個過程時，我很難調用和顯示內容。我試圖從兩個不同的SP調用MYSQL中顯示兩個單獨的記錄集。我可以顯示第一個呼叫，但第二個呼叫失敗。我不確定我做錯了什麼，但也許有人可以幫忙？

我不斷收到錯誤，當我撥打第二個過程：

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

我下面

代碼Windows運行... 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 
} 

Answer 1

要解決的問題請記住在每個存儲過程調用之後調用mysqli對象上的next_result（）函數。看下面的例子：

 <?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(); 
     ?>