Question

我使用内部联接运行此sql语句以从数据库中删除，但是我收到了太多错误

错误

致命错误：未捕获的异常＆＃39; PDOException＆＃39;与消息＆＃39; SQLSTATE [42000]：语法错误或访问冲突：1064您有 SQL语法错误;查看与您的手册相对应的手册 MariaDB服务器版本，用于在＆JOAH; INNER JOIN附近使用正确的语法 ipaddress_likes_map ON ipaddress_likes_map.postat = blog_post.BID INN＆＃39; 在第3行＆＃39;在C：\ xampp \ htdocs \ codejail.net_inc \ dbcontroller.php：57 堆栈跟踪：＃0 C：\ XAMPP \ htdocs中\ codejail.net_inc \ dbcontroller.php（57）： PDOStatement-＆gt; execute（）＃1 C：\ XAMPP \ htdocs中\ codejail.net \用户\ deleteaccount.php（88）： DBController-＆gt; execute（）＃2 {main}引入第57行的C：\ xampp \ htdocs \ codejail.net_inc \ dbcontroller.php

这是我的代码

<?php
   if(isset($_POST['delete'])){
     $pass = $_POST['pasyske'];
     $userkey = $_POST['username'];
     $db_delete = new DBController();
     $db_delete->prepare("DELETE
FROM blog_post
INNER JOIN ipaddress_likes_map ON ipaddress_likes_map.postat = blog_post.BID
INNER JOIN flagpost ON flagpost.postId = blog_post.BID
INNER JOIN postviewmap ON postviewmap.viewpostId = blog_post.BID
INNER JOIN replys ON replys.rid = blog_post.BID
INNER JOIN votepoint_map ON votepoint_map.postlike_id = blog_post.BID
WHERE blog_post.UserName = :alluserpost");
     $db_delete->bind(":alluserpost", $userkey);
     //$db_delete->bind(":password", $encrypt_password);
     $db_delete->execute();
     $pdeleted = $db_delete->getAll(); 
     $db_delete->free();

    if($pdeleted){
        print_r($pdeleted);
    }

   }?>

我确定我的数据库控制器没问题，因为当我运行单个删除语句时它工作得很好

Answer 1

DELETE之后你应该知道从哪个表中删除行。试试这个问题：

$db_delete->prepare("DELETE blog_post 
FROM blog_post
INNER JOIN ipaddress_likes_map ON ipaddress_likes_map.postat = blog_post.BID
INNER JOIN flagpost ON flagpost.postId = blog_post.BID
INNER JOIN postviewmap ON postviewmap.viewpostId = blog_post.BID
INNER JOIN replys ON replys.rid = blog_post.BID
INNER JOIN votepoint_map ON votepoint_map.postlike_id = blog_post.BID
WHERE blog_post.UserName = :alluserpost");

Answer 2

为每个表添加一个别名，并在单词DELETE后面引用它。另外，使用LEFT JOIN而不是INNER JOIN，因为如果某些连接的表没有匹配的行，我猜你仍然希望删除工作事件。

db_delete->prepare("DELETE bp, i, f, p, r, v
FROM blog_post AS bp
LEFT JOIN ipaddress_likes_map AS i ON i.postat = bp.BID
LEFT JOIN flagpost AS f ON f.postId = bp.BID
LEFT JOIN postviewmap AS p ON p.viewpostId = bp.BID
LEFT JOIN replys AS r ON r.rid = bp.BID
LEFT JOIN votepoint_map AS v ON v.postlike_id = bp.BID
WHERE bp.UserName = :alluserpost");

使用内部联接的Sql删除超过3个表

2 个答案: