Is there any good general JPA DAO implementation?

Question

According to this article, a generic JPA DAO (Data Access Object) is a pretty nice template.

Is there a good implementation?

Answer 1

You can take a look at Spring JPA data .

Several new concepts were introduced in Spring Data JPA, for example, creating a query based on a method name, so you can declare a method of type findById(String id) , and the "generic" implementation will interpret the method name and do something like select Entity from Entity where id = 'given string'

Methods such as findByNameAndLastName(String name, String lastName) or even findByNameOrInternalId(String name, int internalId) also supported.

Answer 2

Just wanted to mention a couple more common Tao implementations for JPA:

• Common DAO Toolkit - http://code.google.com/p/generic-dao/
• Related Question in SO - Single DAOs and Common CRUD Methods (JPA / Hibernate + Spring)
• Good blog post about JPA DAO - http://blog.xebia.com/2009/03/09/jpa-implementation-patterns-data-access-objects/