Spring Data JPA Basics
Spring Data JPA, JpaRepository, EntityManager, DataSource, HikariCP, JPA configuration (spring.jpa.*)
1What is JPA (Java Persistence API)?
What is JPA (Java Persistence API)?
Odpowiedź
JPA is a standard Java specification that defines common interfaces for relational object persistence. It allows mapping Java classes to relational database tables. Hibernate, EclipseLink and OpenJPA are implementations of this specification. Using JPA allows changing ORM implementation without rewriting business code.
2What is the main advantage of using JPA over pure JDBC?
What is the main advantage of using JPA over pure JDBC?
Odpowiedź
JPA allows manipulating Java objects rather than writing SQL manually. The ORM automatically handles mapping between classes and tables, generates SQL queries, and manages entity relationships. This reduces boilerplate code, decreases manual mapping errors, and improves business code maintainability.
3What is the main role of the EntityManager in JPA?
What is the main role of the EntityManager in JPA?
Odpowiedź
The EntityManager is the central JPA interface that manages entity lifecycle and their interaction with the database. It provides methods to persist, find, update and delete entities. The EntityManager also manages the persistence context which maintains the first-level cache of loaded entities.
What is the difference between JPA and Hibernate?
What is the persistence context in JPA?
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