My website down 24+ hours

[urbanrif]

I have not touched my website, all was working great. Last day or so it has not worked.

URL: http://www.urbanriffs.co.uk/

message displays:

Error establishing a database connection

 

[leafypiggy]

Hi.

I've restored your database from a backup and readded your mysql users.

 

[urbanrif]

Thank you leafypiggy I am very grateful. Have a great day Sir!

 

[urbanrif]

Its down again says:
Error establishing a database connection