Server :: Relational Interface/wrapper Around SQL Database?

I'm not a database guru, so be patient with me: Is there some kind of "wrapper" software you can put around an SQL database (MySQL perhaps) that allows you to internally configure database rules on a higher level than the database itself can actually implement? (E.g., "rows in table A can be deleted, but only if there are no related rows in table B and only if column x for the row in table A is in state y.")The idea would be to keep from having to trust this kind of logic to the client programs, while also avoiding the need to write a full fledged server daemon just for your application. The clients submit their SQL insert requests to the wrapper daemon, and the daemon passes them on to the database if they pass a rules table defined for that particular database.