Node Express Multiple SQL server Connection

Question

I need to connect to diferent databases on direfent servers. The servers are Microsoft SQL Server.

I do it like this:

dbconfig.js

    var sql1 = require('mssql')
    var sql2 = require('mssql')

    var conn1 = {server:"SERVER IP", database:"db1", user:"foo", password:"foo", port:1433}

    var conn2= {server:"SERVER2 IP", database:"db2", user:"foo2", password:"foo2", port:1433}

var server1= sql1.connect(conn1)
    .then(function() {  debug('Connected'); })
    .catch(function(err) { debug('Error connect SQL Server', err);  });

    var server2= sql2.connect(conn2)
        .then(function() {  debug('Connected'); })
        .catch(function(err) { debug('Error connect SQL Server', err);  });

module.exports = {"ServerConn1": sql1, "ServerConn2": sql2};

After that, both connection are active, but when I do a query to the first connection it didn't work.

The error is Invalid object name 'FooDatabase.dbo.fooTable'.

Can anyone help me to solve this issue?

Thanks!

Answer 1

I implement using MySQL you can do the same thing mssql by passing empty database parameter and letter update database before creates connection.

And you do not need to import two-times just update the DB name before creating connection or query.

const express = 

require('express');  
const app = express();  
const port = process.env.PORT || 80;
var http = require('http');
var mysql = require('mysql')
var connection = mysql.createConnection({
  host     : 'localhost',
  user     : 'root',
  password : '',//here i am not passing db and db is undefined

});

app.get('/db1',function(req,res)
{
connection.config.database="task" //here  i updating db name before query
connection.query('SELECT * FROM tasks', function (error, results, fields) {
    console.log(results)
    res.json(fields)
connection.end()
})
})

app.get('/db2',function(req,res)
{
connection.config.database="cg_taskview" //db2

connection.query('SELECT * FROM tasks', function (error, results, fields) {
     if (error)
    console.log(error); 
    console.log(results)
    res.json(fields)
     });
connection.end()

})

var server = http.createServer(app);
server.listen(port, function () { 
})