通過在PHP中指定特定的ID來刪除多個表

Question

美好的一天。 我是php的新手，現在想學習如何通過給定特定ID將3個表從android刪除到php。

表信息（id，名稱）表良（id，sun，tf）表壞（id，月亮，ts）

    <?php 
     //Getting Id
     $id = $_GET['id'];

     //Importing database
     require_once('dbConnect.php');

     //Creating sql query
     $sql = "DELETE FROM info WHERE id=$id;";
     $sql ="DELETE FROM Good WHERE tf=$id;";
     $sql ="DELETE FROM Bad WHERE ts=$id;";

     //Deleting record in database 
     if(mysqli_query($con,$sql)){
     echo 'Employee Deleted Successfully';
     }else{
     echo 'Could Not Delete Employee Try Again';
     }

     //closing connection 
     mysqli_close($con);
?>

錯誤

最新代碼

<?php 
 //Getting Id
 $mysqli->multi_query(" Many SQL queries ; ");
 $id = (int)$_GET['id'];

 //Importing database
 require_once('dbConnect.php');

 //Creating sql query
 $sql  = "DELETE FROM informaation WHERE id=$id;";
 $sql .= "DELETE FROM work_force WHERE twf=$id;";
 $sql .= "DELETE FROM work_details WHERE ts_id=$id;";

 //Deleting record in database 
 if(multi_query($con,$sql)){
 echo ' Deleted Successfully';
 }else{
 echo 'Could Not Delete . Try Again.' . mysqli_error($con);
 }
 ?>

Answer 1

您需要使用一個多查詢，因為當前您正在覆蓋前兩個查詢。

我修改了您的代碼以連接查詢語句及其適當的功能，包括錯誤檢查。 另外，假設您確實使用mysqli_庫成功連接。

您的require_once('dbConnect.php');

應該在下面包含此憑證，並用您自己的憑證替換以下憑證。

 $con = mysqli_connect("yourhost", "my_user", "my_password", "my_db");

然后做：

require_once('dbConnect.php');

 $id = (int)$_GET['id'];

 $sql  = "DELETE FROM info WHERE id=$id;";
 $sql .= "DELETE FROM Good WHERE tf=$id;";
 $sql .= "DELETE FROM Bad WHERE ts=$id;";

 //Deleting record in database 
 if(mysqli_multi_query($con,$sql)){
 echo 'Employee Deleted Successfully';
 }else{
 echo 'Could Not Delete Employee Try Again.' . mysqli_error($con);
 }

參考：

• http://php.net/manual/en/mysqli.multi-query.php

手冊中的示例：

 
 
 
  
  <?php // WORKING CODE: $mysqli->multi_query(" Many SQL queries ; "); // OK while ($mysqli->next_result()) {;} // flush multi_queries $mysqli->query(" SQL statement #1 ; ") // now executed! $mysqli->query(" SQL statement #2 ; ") // now executed! $mysqli->query(" SQL statement #3 ; ") // now executed! $mysqli->query(" SQL statement #4 ; ") // now executed! ?>
 
  

另外，請確保您確實擁有GET數組的值。

如果確實是整數，則將其替換為：

$id = (int)$_GET['id'];

您當前的代碼可以進行SQL注入 。 將mysqli_*與預處理語句一起使用 ，或將PDO與預處理語句一起使用 。

Answer 2

從i.info中刪除g.good，b.bad，其中i.id = $ id AND g.id = $ id AND b.id = $ id