specification-with-projection

Support Projections with JpaSpecificationExecutor.findAll(Specification,Pageable) for Spring Data JPA

version 2.x.x for Spring Data JPA 2.x (Spring Boot 2.x)

version 1.x.x Spring Data JPA 1.x

How to use

add dependency to pom

<!-- for Spring Data 2.x -->
<dependency>
<groupId>th.co.geniustree.springdata.jpa</groupId>
<artifactId>specification-with-projections</artifactId>
<version>2.0.0</version>
</dependency>

<!-- for Spring Data 1.x -->
<dependency>
<groupId>th.co.geniustree.springdata.jpa</groupId>
<artifactId>specification-with-projections</artifactId>
<version>1.0.6</version>
</dependency>

add annotation @EnableJpaRepositories(repositoryBaseClass = JpaSpecificationExecutorWithProjectionImpl.class) on Application class (Spring Boot)

create your repository and extends JpaSpecificationExecutorWithProjection

public interface DocumentRepository extends JpaRepository<Document,Integer>,JpaSpecificationExecutorWithProjection<Document,Integer> {
/**
* projection interface
**/
public static interface DocumentWithoutParent{
    Long getId();
    String getDescription();
    String getDocumentType();
    String getDocumentCategory();
    List<DocumentWithoutParent> getChild();
}
}

use it

  @Test
public void specificationWithProjection() {
    Specifications<Document> where = Specifications.where(DocumentSpecs.idEq(1L));
    Page<DocumentRepository.DocumentWithoutParent> all = documentRepository.findAll(where, DocumentRepository.DocumentWithoutParent.class, new PageRequest(0,10));
    Assertions.assertThat(all).isNotEmpty();
}

version 1.0.3 RELEASE add support for @NamedEntityGraph and AD-HOC entity graph (via JpaEntityGraph) http://docs.spring.io/spring-data/jpa/docs/1.10.4.RELEASE/reference/html/#jpa.entity-graph

JpaEntityGraph jpaEntityGraph = new JpaEntityGraph(
"birth.sistRecvTm",
EntityGraph.EntityGraphType.FETCH,
new String[]{"sistRecvTm","birth","transfer","merger"}
);
BirthWithoutChild birth = birthRepository.findAll(createSpecBirth(searchData, type.toUpperCase()), BirthWithoutChild.class,jpaEntityGraph,pageable);