Node.js mysql错误不能读取undefined的属性？

我有一个将SMDR数据插入数据库的程序。

这是我的代码：

var net = require('net'), mysql = require('mysql'), PORT = 1752, HOST = '192.168.10.2', pool = mysql.createPool({ host: 'localhost', port: 3307, user: 'root', password: 'root', database: 'mydb' }); function connectionListener(conn) { console.log('Listening for incoming calls...'); } function logCall(phonenumber, operator) { pool.getConnection(function(err, connection) { if (!err) { // If no error exists var opquery = connection.query('SELECT OperatorID FROM tblOperators WHERE Phone_Login = ' + operator, function(err, rows) { if (err) { console.error(err); connection.release(); return; } var query = connection.query('INSERT INTO incoming_calls(phone_number, OperatorID) VALUES("' + phonenumber + '", "' + rows[0].OperatorID + '") ON DUPLICATE KEY UPDATE OperatorID=OperatorID, date_created=NOW()', function(err, rows) { if (err) { console.error(err); } connection.release(); }); }); } else { console.error(err); } }); } function processdata(data) { var phonedata = data.toString().match(/([0-9]?)([0-9]{10})/), operdata = data.toString().match(/([*])([0-9]{4})/); if (phonedata !== null && operdata !== null) { var phonenumber = phonedata[2], oper = operdata[2]; oper = oper.replace('*', ''); phonenumber = phonenumber.slice(0,3)+"-"+phonenumber.slice(3,6)+"-"+phonenumber.slice(6); logCall(phonenumber, oper); } } logCall('999-999-9999', '1203'); var conn = net.createConnection(PORT, HOST, connectionListener); conn.on('data', processdata); conn.setEncoding('utf8'); 

这里是我得到的错误，当表中OperatorID清楚地存在时：

 c:\xampp\htdocs>node listener Listening for incoming calls... c:\xampp\htdocs\node_modules\mysql\lib\protocol\Parser.js:82 throw err; ^ TypeError: Cannot read property 'OperatorID' of undefined at Query._callback (c:\xampp\htdocs\listener.js:27:48) at Query.Sequence.end (c:\xampp\htdocs\node_modules\mysql\lib\protocol\sequences\Sequence.js:96:24) at Query._handleFinalResultPacket (c:\xampp\htdocs\node_modules\mysql\lib\protocol\sequences\Query.js:143:8) at Query.EofPacket (c:\xampp\htdocs\node_modules\mysql\lib\protocol\sequences\Query.js:127:8) at Protocol._parsePacket (c:\xampp\htdocs\node_modules\mysql\lib\protocol\Protocol.js:271:23) at Parser.write (c:\xampp\htdocs\node_modules\mysql\lib\protocol\Parser.js:77:12) at Protocol.write (c:\xampp\htdocs\node_modules\mysql\lib\protocol\Protocol.js:39:16) at Socket.<anonymous> (c:\xampp\htdocs\node_modules\mysql\lib\Connection.js:82:28) at Socket.emit (events.js:95:17) at Socket.<anonymous> (_stream_readable.js:764:14) 

有没有人有任何想法，为什么会发生，我有一个生产数据库使用这个，有相同的确切信息，它的工作原理？

Answer 1

首先检查你的查询结果是否为空，如果它是空白的，你将得到错误ex。

 var opquery = connection.query('SELECT OperatorID FROM tblOperators WHERE Phone_Login = ' + operator, function(err, rows) { if (err) { console.error(err); connection.release(); return; } else { if(rows!="") { var query = connection.query('INSERT INTO incoming_calls(phone_number, OperatorID) VALUES("' + phonenumber + '", "' + rows[0].OperatorID + '") ON DUPLICATE KEY UPDATE OperatorID=OperatorID, date_created=NOW()', function(err, rows) { if (err) { console.error(err); } connection.release(); }); } else { console.log('can not get data from tabel'); } }