问

使用node-mysql时出现SQL Parse错误

希臘神話2502873813 发布于 2023-02-07 16:40

mysql

当我尝试使用node-mysql在MYSQL数据库上调用查询时,我遇到了解析错误.我很确定查询有效.毫无疑问,它通过phpmyadmin运行.

Message.save = function(message, callback){
    db.query("INSERT INTO e_message (chatid, message, userid) VALUES(" + message.chatid + ", '" + message.message +"', " + message.userid + "); SELECT * FROM e_message WHERE chatid = " + message.chatid + " ORDER BY timestamp DESC LIMIT 0, 1;", 
    function(err, rows, fields){
        console.log(err);
        callback(err, new Message(rows[0]));
    });
}



我收到了以下错误:

{ [Error: ER_PARSE_ERROR: 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 'SELECT * FROM e_message WHERE chatid = 1 ORDER BY timestamp DESC LIMIT 0, 1' at line 1]
  code: 'ER_PARSE_ERROR',
  errno: 1064,
  sqlState: '42000',
  index: 0 }


查询通过console.log()看起来像这样:

INSERT INTO e_message (chatid, message, userid) VALUES(1, 'test123', 1);
SELECT * FROM e_message WHERE chatid = 1 ORDER BY timestamp DESC LIMIT 0, 1;


我不知道这有什么不对......

编辑:如果我把它分成两个查询,我得到我想要的结果:

Message.save = function(message, callback){
    db.query("INSERT INTO e_message (chatid, message, userid) VALUES(" + message.chatid + ", '" + message.message +"', " + message.userid + ");", function(err, rows, fields){
        db.query("SELECT * FROM e_message WHERE userid = " + message.userid + " AND chatid = " + message.chatid + " ORDER BY timestamp DESC LIMIT 0, 1;", function(err, rows, filds){
            callback(err, new Message(rows[0]));
        });
    });
}


谢谢!



        
        1 个回答
        
                        
                node-mysql默认情况下不允许您在单个查询中发出多个SQL语句.

为此,您需要在创建连接时设置multipleStatements连接选项.

请注意,允许这样做可能会使您面临SQL注入的风险,尤其是在将语句构建为字符串时.例如,如果您message.userid设置为字符串1);drop database production;SELECT (,则会遇到麻烦.

在这种情况下,你真正想要的可能是插入,第二个SELECT LAST_INSERT_ID()是获取插入最新记录的id.它将返回会话的最新插入的自动增量键,也就是说,它不会受到其他连接/会话的其他插入的影响.

        
                
                    2023-02-07 16:42  回答
                       楼_市早班车_954
                
            
                    
    
    
    
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