Using Static methods or none static methods in Dao Class?

Question

Hi I generate Dao classes for some DB operations

in this manner making methods of Dao class as static or none static is better?

Using sample dao class belo

Answer 1

I always prefer non static classes. Dependencies cannot be injected to an static class and unit tests are harder. Also, its clients cannot replace it with a test double when they are unit tested.

http://googletesting.blogspot.com/2008/12/static-methods-are-death-to-testability.html