JPA Repository

Spring Data Repositories

https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#repositories

Concept

• reduce the amount of boilerplate code to implement data access layers for persistence data
• Central Interface is Repository T: domain class, ID: ID type JPARepository extends CrudRepository extends Repository<T, ID>

https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#reference

Query Method

• CRUD functionality to query on the datastore

• Set up Spring to create proxy instances for those interfaces

  • JavaConfig
  • XML to define a bean

Query Method Creation

• Any text between find (or other introducing keywords) and By is considered to be descriptive unless using one of the result-limiting keywords such as a Distinct e.g. FindTagsByAccount The word(Tags) is ignored and descriptive.
• Repository query keywords https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#appendix.query.method.subject subject keywords

predicate keywords

https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#reference