Question

这里的Spring文档http://docs.spring.io/spring-data/data-jpa/docs/current/reference/html/repositories.html#repositories.custom-implementations给出了向所有存储库或单个存储库添加自定义功能的示例，而不是两者。

假设我想向所有存储库添加一些自定义函数（使用自定义存储库工厂Bean），而另一些只添加到单个存储库（文档说使用自定义接口和自定义Impl）;我怎么能实现这个目标呢？

我在所有存储库中添加“setCurrentTenansInSession”方法的示例代码;现在我想添加一个自定义方法，例如“newCustomMethod”，对于单个存储库（即MyJpaRepository，对于我的自定义存储库工厂）。我该怎么做？

自定义行为界面：

@NoRepositoryBean
public interface MyJpaRepository<T, ID extends Serializable> extends JpaRepository<T, ID> { 
    public void setCurrentTenantInSession(Object object);       
}

自定义行为实施：

public class MultiTenantSimpleJpaRepository<T, ID extends Serializable> extends SimpleJpaRepository<T, ID> implements MyJpaRepository<T, ID> {
    public void setCurrentTenantInSession(Object object) {
        //custom impl
    }
}

自定义存储库工厂bean：

public class MultiTenantJpaRepositoryFactoryBean<T extends Repository<S, ID>, S, ID extends Serializable> extends JpaRepositoryFactoryBean<T, S, ID> {

    @Override
    protected RepositoryFactorySupport createRepositoryFactory(EntityManager entityManager) {
        return new MultiTenantJpaRepositoryFactory(entityManager);
    }
}

最后是自定义存储库工厂：

public class MultiTenantJpaRepositoryFactory extends JpaRepositoryFactory {
    public MultiTenantJpaRepositoryFactory(EntityManager entityManager) {
        super(entityManager);
    }

    @Override
    protected JpaRepository<?, ?> getTargetRepository(RepositoryMetadata metadata, EntityManager entityManager) {
        final JpaEntityInformation<?, Serializable> entityInformation = getEntityInformation(metadata.getDomainType());

        final SimpleJpaRepository<?, ?> repo = new MultiTenantSimpleJpaRepository(entityInformation, entityManager);

        repo.setLockMetadataProvider(LockModeRepositoryPostProcessor.INSTANCE.getLockMetadataProvider());
        return repo;
    }

    @Override
    protected Class<?> getRepositoryBaseClass(RepositoryMetadata metadata) {
        return MultiTenantSimpleJpaRepository.class;
    }
}

Answer 1

您只需要在您提到的文档页面上合并这些方法。让Car成为您想拥有自定义存储库的实体。

CommonCustomRepository定义添加到所有repos的方法：

@NoRepositoryBean
public interface CommonCustomRepository<T, ID extends Serializable> extends JpaRepository<T, ID> {
    String getCustomValue();
}

此回购的实施：

public class CommonCustomRepositoryImpl<T, ID extends Serializable> extends SimpleJpaRepository<T, ID> implements CommonCustomRepository<T, ID> {

    public CommonCustomRepositoryImpl(Class<T> domainClass, EntityManager em) {
        super(domainClass, em);
    }

    public CommonCustomRepositoryImpl(JpaEntityInformation<T, ?> entityInformation,
            EntityManager entityManager) {
        super(entityInformation, entityManager);
    }

    @Override
    public String getCustomValue() {
        return "CustomValue";
    }

}

CarRepository

的自定义方法

@NoRepositoryBean
public interface CustomCarRepository {

    public String getCustomCarValue();
}

实施与汽车相关的自定义方法

public class CarRepositoryImpl implements CustomCarRepository {

    @PersistenceContext
    private EntityManager em;

    @Override
    public String getCustomCarValue() {
        return "CustomCarValue";
    }
}

CarRepository

的组合界面

public interface CarRepository extends CommonCustomRepository<Car, Long>, CustomCarRepository {
}

自定义回购工厂，就像文档

一样

public class CustomRepositoryFactoryBean<R extends JpaRepository<T, I>, T, I extends Serializable> extends
    JpaRepositoryFactoryBean<R, T, I> {

    @Override
    protected RepositoryFactorySupport createRepositoryFactory(EntityManager entityManager) {

        return new CustomRepositoryFactory(entityManager);
    }

    private static class CustomRepositoryFactory<T, I extends Serializable> extends JpaRepositoryFactory {

        private EntityManager entityManager;

        public CustomRepositoryFactory(EntityManager entityManager) {
            super(entityManager);

            this.entityManager = entityManager;
        }

        @Override
        protected Object getTargetRepository(RepositoryMetadata metadata) {

            return new CommonCustomRepositoryImpl<T, I>((Class<T>) metadata.getDomainType(), entityManager);
        }

        @Override
        protected Class<?> getRepositoryBaseClass(RepositoryMetadata metadata) {

            // The RepositoryMetadata can be safely ignored, it is used by the JpaRepositoryFactory
            // to check for QueryDslJpaRepository's which is out of scope.
            return CommonCustomRepositoryImpl.class;
        }
    }
}

配置的最后一点，就像在文档

中一样

<jpa:repositories base-package="com.example" factory-class="com.example.CustomRepositoryFactoryBean"/>

Spring Jpa将自定义功能添加到所有存储库，同时将其他自定义功能添加到单个存储库

1 个答案: