套接字。io实时应用。

So I have another project that I built a few months ago. It currently uses jquery with ajax and makes a call to a php script every 30 seconds. The php script queries mysql and passes back the results to display. In this application the person has the ability to add/edit/remove records from the db and when they do the list of results from the db needs to update the list they see. So far it seems to do the job, but looking down the road the db will get bigger and it will need to be more in real time, meaning not just refresh every 30 seconds but as instantaneous as possible.So I have another project that I built a few mo