Last night my data base disapeared from the server and now my whole site is gone. this is the error I get when I go to my admin.

0 DB_ERROR_NOT_CONNECTED
in:
[select * from project_version WHERE project_version_key = 'Zen-Cart Database' ]
If you were entering information, press the BACK button in your browser and re-check the information you had entered to be sure you left no blank fields.

my host says there trying to figure it out but I was wondering if anyone had had this issue before.