Connecting to SQL Server from Nodejs

Question

I am working on a sample application using Node js and SQL server 2008.

To access SQL server from node js am using seriate [http://developer.leankit.com/painless-sql-server-with-nodejs-and-seriate/].

Below is my sample code

File ./DBLayer/db.js code

var sql = require("seriate");

var config = {
"server": "127.0.0.1",
"user": "sa",
"password": "12kafour~9999",
"database": "Tickets"
};

sql.setDefaultConfig( config );

exports.sqlDb = sql;

And file app.js code

var express = require('express');
var app = express();
var path = require('path');
var bodyParser = require('body-parser');
var sqlDb = require('./DBLayer/db.js');

//-- set the view engine
app.set('view engine' , 'ejs');

app.use( bodyParser.json() );       // to support JSON-encoded bodies

app.use(bodyParser.urlencoded({     // to support URL-encoded bodies ??
  extended: true
}));

//-- set the routes
app.get('/login' , function(req , res){
//-- set the view to render
res.render('login' , {title:'Login Screen' , error : ''});
});

app.post('/login' , function(req , res) {

 sqlDb.execute( {
      query: "SELECT count(*) FROM USERS WHERE LOGIN ='" + req.body.username   + "'" + "AND PASSWORD = '" + req.body.pwd + "'"
  } ).then( function( results ) {
      res.render('login' , {title:'Login Screen' , error : 'u r the one...'});
  }, function( err ) {
      res.render('login' , {title:'Login Screen' , error : 'Invalid Login/Password.'});
  });
});

 //-- set the port
 var server = app.listen(3000 , function() {
 console.log('Server Ready..')
 });

When user enters username and password and submits am getting "TypeError: sqlDb.execute is not a function" error.

I am not sure why I am getting this error.

Answer 1

You should change this line:

var sqlDb = require('./DBLayer/db.js');

to

var sqlDb = require('./DBLayer/db.js').sqlDb;

or to change this line:

exports.sqlDb = sql;

to

exports = sql;

Explanation: In Node when you do:var sqlDb = require('./DBLayer/db.js'); it make sqlDb to be the exports object.

So in your code you have exports.sqlDb = sql. The compiler is right exports don't have execute function. exports only have 1 var, exports.sqlDb.

---

Bonus Tip: If you really want you code to work, without change app.js you can add this to the end of your module:

exports.execute=function(){
    return sql.execute.call(sql,arguments)
}