I woke up this morning and this is what i got when i went to my website:

Sorry!
There seems to be a problem connecting to our database. Please give us a few minutes to remedy the problem. Thank you

I have no idea why. I have not changed anything and i have no idea how to fix it.
Can someone please help me

I have another website that uses zencart aswell, but that works fine, so im completely lost here.

I cant tell you what version of zencart is it, cos i dunno where to look for it.