Skip to content

Spring Data JPA

Java Persistence API

JPA provides a POJO based persistence model for object relationship mapping * Simplify the persistence code development * Shield the differences of different persistence APIs for java community

Spring Data Jpa Anotations

Entity

  • @Entity, @MappedSuperclass
  • @Table(name)

Primary Key

  • @Id
  • @GeneratedValue(stategy, generator)
  • @SequenceGenerator(name, sequenceName)

Mapping

  • @Column(name, nullable, length, insertable, updatable)
  • @JoinTable(name), @JoinColumn(name)

Relationship

  • @OnetoOne, @OneToMany, @ManyToOne, @ManyToMany
  • @OrderBy

Repository

Enable JPA Repository

  • @EnableJPARepositories
  • @NoRepositoryBean

Repository<T, ID> Interface

  • CrudRepository<T, ID>
  • PagingAndSortingRepository<T, ID>
  • JpaRepository<T, ID>

Query Methods

  • find...By.../read...By.../query...By.../get...By...
  • count...By...
  • ...OrderBy...[ASC/DESC]
  • And/Or/IgnoreCase
  • Top/First/Distinct

Paging Query

  • PagingAndSortingRepository<T, ID>
  • Pageable/Sort
  • Slice<T>/Page<T>

How Jpa Repository Become to Bean

JpaRepositoriesRegistrar

  • Activate @EnableJpaRepositories
  • Return JpaRepositoryConfigExtension

RepositoryBeanDefinitionRegistrarSupport.registerBeanDefinitions

  • Register Repository Bean(type is JpaRepositoryFactoryBean)

RepositoryConfigurationExtensionSupport.getRepositoryConfigurations

  • Get Repository configurations

JpaRepositoryFactory.getTargetRepository

  • Create Repository

How the Jpa Repository Methods Been Interpreted

  • RepositoryFactorySupport.getRepository adds Advice
  • DefaultMethodInvokingMethodInterpretor

  • QueryExecutorMethodInterpretor

  • AbstractJpaQuery.execute run the queries

  • Grammer parse is in Part