UpdateAddressOfAUser.js

var mysql = require('mysql');

var con = mysql.createConnection({
    host: "localhost",
    user: "root",
    password: "root",
    database: "Employee"
});

con.connect(function (err) {
    if (err) throw err;
    console.log('Connected');
});

var getEmpObj = function (empName, callback) {
    let seletQuery = "SELECT * FROM Employee where employeeName = '" + empName + "'";
    con.query(seletQuery, function (err, result, fields) {
        if (err) throw err;
        callback(result);
    });
}

var updateEmpAddress = function (empName, empNewAddress, callback) {
    getEmpObj(empName, function(result) {
        let empId = result[0].employeeId;
        let updateAddressQuery = "UPDATE Employee SET employeeAddress = '" + empNewAddress + "' WHERE employeeId = " + empId;
        con.query(updateAddressQuery, function (err, result) {
            if (err) throw err;
            console.log(result.affectedRows + " record(s) updated");
            callback();
        });
    });
}

var printEmployeeDetails = function(empName) {
    getEmpObj(empName, function(result) {
        console.log(JSON.stringify(result[0]));
        con.end();
    });
}

updateEmpAddress("Aditya", "Delhi", printEmployeeDetails("Aditya"));