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Generic DAOs With Hades
This document discusses the Hades project, which provides a generic data access layer for Java applications using the Java Persistence API and Spring. It introduces the GenericDao interface and GenericJpaDao base class that provide common CRUD and query methods. It also describes how to customize queries using JPA annotations or custom implementations. The presentation demonstrates pagination, sorting, parameters and modifying queries. Hades supports auditing, domain base classes and integration with Spring.
Generic DAOs With Hades
- 1. HadesOliver Gierke -Synyx GmbH & Co. KG „Simple things should be simple, complex things should be possible.“ Alan Kay
- 2. www.devoxx.com Speaker ■ Oliver Gierke- gierke@synyx.de ■ Software Architect @ Synyx GmbH & Co. KG ■ JavaEE, Spring (beyond the obvious) ■ Financial industry, automotive ■ Hades project lead ■ olivergierke
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- 8. www.devoxx.com 1. Create interface 2.Declare methods 3. Tune queries
- 9. www.devoxx.com GenericDao UserDao GenericJpaDao CRUD Querymethods GenericDaoFactory / GenericDaoFactoryBean
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- 12. @Query @Query(„from User uwhere ...“) List<User> findByLastname(...);
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- 15. @Query(„from User uwhere u.lastname = ?“) Page<User> findByLastname( String lastname, Pageable pageable);
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- 17. @Query(„from User uwhere u.lastname = :lastname or u.firstname = :firstname“) List<User> findByLastOrFirstname( @Param(„lastname“) String lname, @Param(„firstname“) String fname)
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- 24. www.devoxx.com GenericDao UserDao UserDaoCustom GenericJpaDaoUserDaoImpl CRUD Query methods Custom implementation GenericDaoFactory / GenericDaoFactoryBean
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- 31. www.devoxx.com Meta stuff ■ Currentversion: 1.0 (stable 1.1-snapshot) ■ Apache license 2.0 ■ http://hades.synyx.org