guide devon4j spring repository

Table of Contents

• Spring Data in devon4j-spring
  • Dependency
  • Example
  • Further examples
  • Auditing

Spring Data in devon4j-spring

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In devon4j-spring, spring-data-jpa is provided via devon4j-starter-spring-data-jpa extension, which provides advanced integration (esp. for QueryDSL).

Spring Data uses a fragment approach to implement custom functionality for repositories. For Spring applications, devon4j provides a solution that works without this fragment approach.

The repository must extend DefaultRepository, which uses GenericRepositoryImpl as implementation. The QueryUtil helper class provides methods to support pagination and query creation.

Dependency

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<dependency>
  <groupId>com.devonfw.java.starters</groupId>
  <artifactId>devon4j-starter-spring-data-jpa</artifactId>
</dependency>

Example

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public interface ExampleRepository extends DefaultRepository<ExampleEntity> {

  @Query("SELECT example FROM ExampleEntity example" //
      + " WHERE example.name = :name")
  List<ExampleEntity> findByName(@Param("name") String name);

  @Query("SELECT example FROM ExampleEntity example" //
      + " WHERE example.name = :name")
  Page<ExampleEntity> findByNamePaginated(@Param("name") String name, Pageable pageable);

  default Page<ExampleEntity> findByCriteria(ExampleSearchCriteriaTo criteria) {
    ExampleEntity alias = newDslAlias();
    JPAQuery<ExampleEntity> query = newDslQuery(alias);
    String name = criteria.getName();
    if ((name != null) && !name.isEmpty()) {
      QueryUtil.get().whereString(query, $(alias.getName()), name, criteria.getNameOption());
    }
    return QueryUtil.get().findPaginated(criteria.getPageable(), query, false);
  }

}

Further examples

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Auditing

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