通过在PHP中指定特定的ID来删除多个表

Question

美好的一天。 我是php的新手，现在想学习如何通过给定特定ID将3个表从android删除到php。

表信息（id，名称）表良（id，sun，tf）表坏（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);
?>

错误

最新代码

<?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

您需要使用一个多查询，因为当前您正在覆盖前两个查询。

我修改了您的代码以连接查询语句及其适当的功能，包括错误检查。 另外，假设您确实使用mysqli_库成功连接。

您的require_once('dbConnect.php');

应该在下面包含此凭证，并用您自己的凭证替换以下凭证。

 $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);
 }

参考：

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

手册中的示例：

 
 
 
  
  <?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，请确保您确实拥有GET数组的值。

如果确实是整数，则将其替换为：

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

您当前的代码可以进行SQL注入 。 将mysqli_*与预处理语句一起使用 ，或将PDO与预处理语句一起使用 。

Answer 2

从i.info中删除g.good，b.bad，其中i.id = $ id AND g.id = $ id AND b.id = $ id