Question

我是使用PHP运行SQL命令的新手，但我尝试做的是在运行脚本时截断数据库中的特定表。我可以很好地截断一个表，但当我尝试多个表时，我遇到了问题！代码如下，任何指针？！提前致谢

 <?php
    var_dump($_POST);
    $myServer = $_POST['host'];
    $myUser = $_POST['user'];
    $myPass = $_POST['password'];
    $myDB = $_POST['db'];

    $con = mysqli_connect($myServer, $myUser, $myPass) or die("Connection 
    Failed");
    mysqli_select_db($con, $myDB)or die("Connection Failed");


    $query = ("
        SET FOREIGN_KEY_CHECKS = 0;

        TRUNCATE table customers;

        TRUNCATE table customers2;

        SET FOREIGN_KEY_CHECKS = 1;


    ");

    if(mysqli_query($con, $query)){
    echo "table empty";}
    else{
     echo("Error description: " . mysqli_error($con));}


    ?>

Answer 1

一次执行一个查询

mysqli_query($con, "SET FOREIGN_KEY_CHECKS = 0;");
mysqli_query($con, "TRUNCATE table customers;");
mysqli_query($con, "TRUNCATE table customers2;");
mysqli_query($con, "SET FOREIGN_KEY_CHECKS = 1;");

或使用mysqli_multi_query

mysqli_multi_query($con, "
SET FOREIGN_KEY_CHECKS = 0; 
TRUNCATE table customers;
TRUNCATE table customers2;
SET FOREIGN_KEY_CHECKS = 1;
");

Answer 2

mysqli_query一次只允许一个查询。如果您想一次使用多个查询，请使用mysqli_multi_query。文档：http://php.net/manual/en/mysqli.multi-query.php

在您的代码中，您将更改

mysqli_query($con, $query)

到

mysqli_multi_query($con, $query)

使用PHP执行SQL查询

2 个答案: