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我有一个网页，它将根据用户将进行的某个下拉选择显示信息。为了查看数据，我运行了多个查询以确定将显示哪些数据。如果我只使用 1 个查询和 pdo 语句，它对我有用。但是，我有多个查询和 pdo 语句，当我尝试使用多个查询时，我得到一个Internal Server Error.

谁能提供一些关于问题可能是什么的建议？这是我的一个查询和 PDO 语句的示例：

$_400p_1_1 = "SELECT CAST([Program_ID] AS INT) AS Program_ID
      ,CAST([Series] AS INT) AS Series
      ,[Supplier_Group_Name]
      ,[Buyer Group Name]
      ,[Fund Name]
      ,CAST([Agreement_ID] AS INT) AS Agreement_ID
      ,[Location Group Name]
      ,[Product Group Name]
      ,[Shipping Group Name]
      ,CAST([Tier_ID] AS INT) AS Tier_ID
      ,[Retro_to_1]
      ,CAST([Payments per Year] AS INT) AS [Payments per Year]
      ,[Condition Unit of Measure]
      ,CAST([Condition Minimum] AS INT) AS [Condition Minimum]
      ,CAST([Condition Maximum] AS INT) AS [Condition Maximum]
      ,CAST([Incentive Multiplier] AS DEC(5,4)) AS [Incentive Multiplier]
  FROM [test].[dbo].[vExample]
  WHERE [Supplier_Group_Name] = '$supp' AND [Series] = 1 AND [Fund Name] = '400P' AND [Agreement_ID] = 1
  ORDER BY [Supplier_Group_Name]";

$stmt = $pdo->prepare($_400p_1_1);
$stmt->execute();
$results1 = $stmt->fetchAll();

这是一个引入要显示的信息的示例：

<label>Program ID:</label><input value="<?php echo $results1[0]['Program_ID'];?>" readonly>

我还应该提到，位于 中的下拉选择page1.php是通过 AJAX 发送到update.php查询和 PDO 语句所在的位置，以及其他 HTML/PHP 代码。同样，如果我只使用一个查询和一个 PDO 语句，它就可以正常工作。

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