node js + mysql push notification - mysql

Question

I am working on project where I want to give notification like facebook. i.e. when someone comments on others profile or like any link on others profile. I want to use nodejs for real time push notification.
These data of comments, likes are stored in the mysql database in "Notification table" via ajax request or by posting the form to php.I found many tutorials of nodejs on net for the real time push notifications but unfortunately they talk about keeping watch on file and emits the notification when file is updated.
does anybody knows how to keep watch on the mysql table, so whenever, any data is inserted in the table, it emits the notification. I am not getting any way what kind of code I should write in nodejs.
Please let me know if more explanation is needed.
Thanks in advance.

Answer 1

You can use node.js with a mysql library to poll your database for new notifications, which I think is what you're trying to do. I've never done that specific task personally, but I know it's achievable.
In terms of what kind of code you need to write, try looking up "Node Middleware Tutorials" with perhaps some variations that include MySQL in the search query and you'll find at least an idea of what you should be looking for.
If I can I will update this answer with more specific code samples to get you moving in the right direction.

Answer 2

You can use nowjs and add on the after save (if you are using an mysql active record) to notify the client with this package.
On the server
var httpServer = require('http').createServer(function(req, response){ /* Serve your static files */ })
httpServer.listen(8080);
var nowjs = require("now");
var everyone = nowjs.initialize(httpServer);
everyone.now.logStuff = function(msg){
console.log(msg);
}
On the client
<script type="text/javascript" src="http://localhost:8080/nowjs/now.js"></script>
<script type="text/javascript">
now.ready(function(){
// "Hello World!" will print on server
now.logStuff("Hello World!");
});
</script>
For more information take a look at the examples