Node.js mysql error cannot read property of undefined?

Question

I have a program that inserts SMDR data into a database as it comes in.

Here is my code:

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');

And here is the error that I get, when OperatorID clearly does exist within the table:

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)

Does anyone have any ideas as to why this would happen, I have a production database that uses this, has the same exact information and it works?

Answer 1

first check your query result is blank or not if it blank than you will get that error 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');
              }
            }