how can i build websocket application using codeigniter

Codeigniter cant do this out of the box. You can include a library like http://socketo.me/ that can do this or take a look at this projects

https://github.com/ranchor/socket-node-m...ter-chat-1
https://github.com/llbbl/codeigniter-chat

Hi Rufnex,
I am using ur thread "https://github.com/ranchor/socket-node-mysql-codeigniter-chat-1" for chatting in codeigniter. And it's perfectly working with mysql but i want to integrate it with POSTGRES. So please help me to integrate it with POSTGRES.
Thanks.

Just change your database configuration to postgre

db['default']['dbdriver'] = 'postgre';

And create the needed tables.