const express = require('express')
const sql = require('mssql');
const Connection = require('tedious').Connection;

var config = {
  userName: 'user' ,
  password: 'pass',
  domain: "AD",
  server: serversIP,
  database: 'test',
  port: 2222,
  debug: true,
  driver: 'tedious',
  options: {
    database:"test",
    instanceName : "instance"
  }
}
var connection = new Connection(config);
connection.on('connect', function(err) {
      if (err) {
        console.log(err);
      } else {
        console.log("server is connected to DB")
      }}
 );

app.get("/" , (req, res)=>{
    new sql.Request().query(`SELECT * FROM test `, (err, recordset) => {
      if (err) {
        console.log(err);
        return;
        }
      else {
        res.send(JSON.stringify(recordset));
        }
      });
    request.query();
    });

app.get("/getUsers", (req, res)=>{
  sql.connect(config, function (err) {
    var request = new sql.Request();
    if (err) {
        console.log(err);
        return;
    }
  new sql.query(`SELECT * FROM dbo.tblDatabaseUserIDs_lookup `, (err, recordset) => {
    console.log("first error msg");
    if (err) {
      console.log(err);
      return;
      }
    else {
      console.log("second error msg");
      res.send(JSON.stringify(recordset));
      }
    });
    console.log("3rd error msg");
  //req.query();
  });
});

sql.connect(config, function (err) {
    var request = new sql.Request();
    if (err) {
        console.log(err);
        return;
    }

...connection.callProcedure(function (err) {
    new sql.query(`SELECT * ....

connection.commitTransaction