为什么反引号在 PDO 查询中失败?

Why does backticks fails in PDO query?

我有一个 table 名称中有连字符,我无法更改 table 名称,所以我认为反引号会有所帮助。

不幸的是,它失败了,一些谷歌搜索没有给我任何答案。我该如何解决?

例如:

    $stmt = $this->_dbh->prepare(
        'UPDATE `:table`
        SET status = NOT status
        WHERE id=:id;');


    $stmt->bindParam(':table',$this->_settings['table'], PDO::PARAM_STR);
    $stmt->bindParam(':id',$data['id'], PDO::PARAM_INT);
    if( $stmt->execute() ){
        return 'Success';
    }
    else{
        $this->_log( $stmt->errorInfo() );
        return 'Action failed.';
    }

在日志中,带反引号:

13:25:18    42S02
1146
Table 'db_name.'table-name'' doesn't exist

没有反引号:

13:38:14    42000
1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''table-name'
            SET status = NOT status
            WHERE id='1'' at line 1

如果需要注入table名字,不能作为绑定变量来做;只要该值已列入白名单,就可以使用

$stmt = $this->_dbh->prepare(
        sprint(
            'UPDATE `%s`
                SET status = NOT status
              WHERE id=:id;',
            $this->_settings['table']
        )
    );


$stmt->bindParam(':id',$data['id'], PDO::PARAM_INT);