Spring Persistence Concepts

Internal

• Spring Framework
• JdbcTemplate
• Spring Data JPA

Repository

A repository is a Data Access Layer (or Persistence Layer) application component that intermediates interaction with a database: all database-related operations are done though the repository.

Any repository implementation needs access to a persistence resource, depending on the persistence technology used. For example, a JDBC-based repository needs access to a JDBC DataSource, while a JPA-based repository needs access to an EntityManager. A repository can be configured with XML, or the corresponding Java class can be annotated with @Repository.

Object IDs

• When persisting objects in a relational database, it is generally a good idea to have one field in the object that uniquely identifies the object. See Relational Databases.