php - multi_query 不在循环内运行

Question

我放入另一个查询中的多重查询无法运行。内部查询中的存储过程未执行。多重查询单独运行良好，但在循环内却运行不佳。冷你请检查一下，为什么 InnerQuery 不在循环内执行？

 <?php
 include ("../mysqli.php");
 if (mysqli_connect_errno()) {
     printf("Connection error: %s\n", mysqli_connect_error());
     exit();
 }

 # Check Start Time 
 $time1 = microtime(true); 

 ## Start 
 if ($DBquery = $mysqli->query("SELECT `id` FROM `Universe`")) {
     while($obj = $DBquery->fetch_object()){
         $id = $obj->id;
         echo "Start with Product-ID: " . $id . "<br>";

         # Defining Inner Query
         $DBInnerQuery = "
         SET @CATEGORY  := (SELECT ....);
         SET @Date      := (SELECT ...
         CALL `PROCEDURE1`; 

         SET @COUNTRY := (SELECT ....);
         CALL `PROCEDURE2`; 
         ...
         ";

         # Inner Query does not run and I don't know why:
         if ($mysqli->multi_query($DBInnerQuery)) {
             $time2 = microtime(true) - $time1;
             echo "Scan for Product-Id " . $id . " solved in " 
             . round ($time2, 4) . " seconds<br>";
         }

     }
 }
 echo "End of Product Check." . "<br>";
 ?>

Answer 1

同时，我已经解决了这个问题:

 # Defining Inner Query
          CALL `PROCEDURE1;`; 

 # Multi Query 
 if ($mysqli->multi_query($DBInnerQuery)) {
    echo "<hr>" . "Scan for all Items solved." . "<br>";
 }

 $time2 = microtime(true) - $time;
 echo "Used Time: " 
     . round ($time, 4) . " Seconds<br>";

 echo "End." . "<br>";