Should the data access layer contain business logic?

Question

I\'ve seen a trend to move business logic out of the data access layer (stored procedures, LINQ, etc.) and into a business logic component layer (like C# objects).

Answer 1

Business logic in the data layer was common in client/server apps, as there really was no business logic layer per se (unless you could really, seriously prevent anyone from connecting to the database outside the application). Now that web apps are more common, you're seeing more 3- and 4-tier apps (client+web server+app server+database server), and more companies are following best practices and consolidating business logic in its own tier. I don't think there will be any less work for database developers, they'll probably just become the ones that write the business logic layer (and let an ORM tool write most of the database layer).