Generic DAOs With Hades
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Slides from the talk on the open source project Hades - http://hades.synyx.org
Transcript of Generic DAOs With Hades
HadesOliver Gierke - Synyx GmbH & Co. KG
„Simple things should be simple, complex things should be possible.“Alan Kay
www.devoxx.com
Speaker
■ Oliver Gierke - [email protected]
■ Software Architect @ Synyx GmbH & Co. KG
■ JavaEE, Spring (beyond the obvious)
■ Financial industry, automotive
■ Hades project lead
■ olivergierke
Java Persistence API
Query methods
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1. Create interface2. Declare methods3. Tune queries
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GenericDao UserDao
GenericJpaDao
CRUD Query methods
GenericDaoFactory /GenericDaoFactoryBean
Derive
User findByUsername( String username);
Named Query
@NamedQuery(name=“User.findByLastname“ query=“...“)
List<User> findByLastname(...);
@Query
@Query(„from User u where ...“)List<User> findByLastname(...);
PaginationSorting
@Query(„from User u where u.lastname = ?“)Page<User> findByLastname( String lastname, Pageable pageable);
@Param(„name“)
@Query(„from User u where u.lastname = :lastname or u.firstname = :firstname“)
List<User> findByLastOrFirstname(@Param(„lastname“) String lname,@Param(„firstname“) String fname)
@Modifying
@[email protected](„...“)int undefaultAllBut(Role role);
Spring integration
<hades:dao-config base-package=“foo.**.dao“ />
Spring IDE Plugin
Custom DAO code
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GenericDao UserDao UserDaoCustom
GenericJpaDao UserDaoImpl
CRUD Query methods Customimplementation
GenericDaoFactory /GenericDaoFactoryBean
Additionalsupport
Auditing
Created? Modified?Who? When?
Domain base classes
Questions?
WTF
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Meta stuff
■ Current version: 1.0 (stable 1.1-snapshot)
■ Apache license 2.0
■ http://hades.synyx.org
