Connect to SQL Server database from Node.js
This is mainly for future readers. As the question (at least the title) focuses on "connecting to sql server database from node js", I would like to chip in about "mssql" node module.
At this moment, we have a stable version of Microsoft SQL Server driver for NodeJs ("msnodesql") available here: https://www.npmjs.com/package/msnodesql. While it does a great job of native integration to Microsoft SQL Server database (than any other node module), there are couple of things to note about.
"msnodesql" require a few pre-requisites (like python, VC++, SQL native client etc.) to be installed on the host machine. That makes your "node" app "Windows" dependent. If you are fine with "Windows" based deployment, working with "msnodesql" is the best.
On the other hand, there is another module called "mssql" (available here https://www.npmjs.com/package/mssql) which can work with "tedious" or "msnodesql" based on configuration. While this module may not be as comprehensive as "msnodesql", it pretty much solves most of the needs.
If you would like to start with "mssql", I came across a simple and straight forward video, which explains about connecting to Microsoft SQL Server database using NodeJs here: https://www.youtube.com/watch?v=MLcXfRH1YzE
Source code for the above video is available here: http://techcbt.com/Post/341/Node-js-basic-programming-tutorials-videos/how-to-connect-to-microsoft-sql-server-using-node-js
Just in case, if the above links are not working, I am including the source code here:
var sql = require("mssql");var dbConfig = { server: "localhost\\SQL2K14", database: "SampleDb", user: "sa", password: "sql2014", port: 1433};function getEmp() { var conn = new sql.Connection(dbConfig); conn.connect().then(function () { var req = new sql.Request(conn); req.query("SELECT * FROM emp").then(function (recordset) { console.log(recordset); conn.close(); }) .catch(function (err) { console.log(err); conn.close(); }); }) .catch(function (err) { console.log(err); }); //--> another way //var req = new sql.Request(conn); //conn.connect(function (err) { // if (err) { // console.log(err); // return; // } // req.query("SELECT * FROM emp", function (err, recordset) { // if (err) { // console.log(err); // } // else { // console.log(recordset); // } // conn.close(); // }); //});}getEmp();The above code is pretty self explanatory. We define the db connection parameters (in "dbConfig" JS object) and then use "Connection" object to connect to SQL Server. In order to execute a "SELECT" statement, in this case, it uses "Request" object which internally works with "Connection" object. The code explains both flavors of using "promise" and "callback" based executions.
The above source code explains only about connecting to sql server database and executing a SELECT query. You can easily take it to the next level by following documentation of "mssql" node available at: https://www.npmjs.com/package/mssql
UPDATE:There is a new video which does CRUD operations using pure Node.js REST standard (with Microsoft SQL Server) here: https://www.youtube.com/watch?v=xT2AvjQ7q9E. It is a fantastic video which explains everything from scratch (it has got heck a lot of code and it will not be that pleasing to explain/copy the entire code here)
I am not sure did you see this list of MS SQL Modules for Node JS
Share your experience after using one if possible .
Good Luck
We just released preview driver for Node.JS for SQL Server connectivity. You can find it here:Introducing the Microsoft Driver for Node.JS for SQL Server.
The driver supports callbacks (here, we're connecting to a local SQL Server instance):
// Query with explicit connectionvar sql = require('node-sqlserver');var conn_str = "Driver={SQL Server Native Client 11.0};Server=(local);Database=AdventureWorks2012;Trusted_Connection={Yes}";sql.open(conn_str, function (err, conn) { if (err) { console.log("Error opening the connection!"); return; } conn.queryRaw("SELECT TOP 10 FirstName, LastName FROM Person.Person", function (err, results) { if (err) { console.log("Error running query!"); return; } for (var i = 0; i < results.rows.length; i++) { console.log("FirstName: " + results.rows[i][0] + " LastName: " + results.rows[i][1]); } });});Alternatively, you can use events (here, we're connecting to SQL Azure a.k.a Windows Azure SQL Database):
// Query with streamingvar sql = require('node-sqlserver');var conn_str = "Driver={SQL Server Native Client 11.0};Server={tcp:servername.database.windows.net,1433};UID={username};PWD={Password1};Encrypt={Yes};Database={databasename}";var stmt = sql.query(conn_str, "SELECT FirstName, LastName FROM Person.Person ORDER BY LastName OFFSET 0 ROWS FETCH NEXT 10 ROWS ONLY");stmt.on('meta', function (meta) { console.log("We've received the metadata"); });stmt.on('row', function (idx) { console.log("We've started receiving a row"); });stmt.on('column', function (idx, data, more) { console.log(idx + ":" + data);});stmt.on('done', function () { console.log("All done!"); });stmt.on('error', function (err) { console.log("We had an error :-( " + err); });If you run into any problems, please file an issue on Github: https://github.com/windowsazure/node-sqlserver/issues