Buradasın
Spring Data JPA Multi-Column Join Methods
woolha.com/tutorials/spring-data-jpa-multi-columns-join-fetchYapay zekadan makale özeti
- Using @JoinColumns
- @JoinColumns annotation enables defining join criteria using multiple related columns
- Default behavior assumes @Id column as referenced unless explicitly defined
- Join columns must be defined with foreign key and referencedColumnName attributes
- Insertable and updatable attributes can be set to false to avoid duplication
- EAGER fetch type works with @ManyToOne relationships
- LAZY fetch type doesn't work with @JoinColumns due to proxy limitations
- Using Native Query
- Native query provides alternative when @JoinColumns isn't suitable
- Native queries can be created using @Query annotation or EntityManager
- Default return type is Object[] or List<Object[]>
- Result requires manual field casting
- Hibernate provides transformer for converting Object[] to usable objects
- Native query can be unwrapped to Hibernate Query for better performance