Accessing the database every 5 minutes

Need Help
1

Hello! Thank you for reading.
Accessing the database every 5 minutes,and i want to indicate Flash Message in front of Cakephp system. Is that possible?

If it is possible, how can i program that?
If may i ask, i want to know the functions which are used on it.

Thank you!

2

you can use ajax or websocket for that.

3

Thank you for your advice!

i will use javascript.

Thanks a lot!