Manual DAL & BLL vs. ORM

Question

Which approach is better: 1) to use a third-party ORM system or 2) manually write DAL and BLL code to work wi

Answer 1

As others explain, there is a fundamental difficulty with ORM's that make it such that no existing solution does a very good job of doing the right thing, most of the time. This Blog Post: The Vietnam Of Computer Science echoes some of my feelings about it.

The executive summary is something along the lines of the assumptions and optimizations that are incompatible between object and relational models. although early returns are good, as the project progresses, the abstractions of the ORM fall short, and the extra overhead of working around it tends to cancel out the successes.