What are the arguments for and against business logic in stored procedures?
Against stored procedures: business logic in programming space
I place a high value on the power of expression, and I don't find the SQL space to be all that expressive. Use the best tools you have on hand for the most appropriate tasks. Fiddling with logic and higher order concepts is best done at the highest level. Consequently, storage and mass data manipulation is best done at the server level, probably in stored procedures.
But it depends. If you have multiple applications interacting with one storage mechanism and you want to make sure it maintains its integrity and workflow, then you should offload all of the logic into the database server. Or, be prepared to manage concurrent development in multiple applications.