Node.js synchronously with mysql query - mysql

Question

I am trying to implement a synchronous query in mysql with node.js, I tried several ways and did not succeed
I am new to node.js
I use express.js
connection.js
var mysql = require('mysql');
var connMySql = function() {
return mysql.createConnection({
host : 'localhost',
user : 'root',
password : '******',
database : 'ress'
});
}
module.exports = function() {
return connMySql;
}
DAO.js
function UserDAO(connection){
this._connection = connection();
}
UserDAO.prototype.createUser = function (user, callback){
var sql = "insert into... ";
this._connection.query(sql, function(err, result){
//console.log(result)
//console.log()
if (err){
callback(err,false )
}
if (result){
var newI = result.insertId
var sqlOther = "insert into ..... ";
this._connection.query(sql, function(err, result){
if (err){
callback(err,false )
}else if (result.length > 0){
callback(false, result.insertId)
}
});
}
});
}
I try implements await, async and Promisse(.then) but no success.
What I need to make calls synchronously and return insert id?
thanks

Answer 1

From mysql repo I see that you're missing connection.connect()

Answer 2

connection.js
var mysql = require('mysql');
var connection = mysql.createConnection({
host : 'localhost',
user : 'root',
password : '******',
database : 'ress'
});
connection.connect(function(err) {
if (err) throw err;
});
module.exports = connection;
DAO _connection must be closed when it's done with it's job
UserDAO.prototype.createUser = function (user, callback){
var sql = "insert into... ";
this._connection.query(sql, function(err, result){
//console.log(result)
//console.log()
if (err){
callback(err,false )
this._connection.end();
}
if (result){
var newI = result.insertId
var sqlOther = "insert into ..... ";
this._connection.query(sql, function(err, result){
if (err){
callback(err,false )
} else if (result.length > 0){
callback(false, result.insertId)
}
this._connection.end();
});
}
});
}