Question

您需要创建一个通用的JpaRepository，以便处理系统所做的所有事务。请遵循此示例here。

它与实现有点不同，因为我的目标不是进行搜索而是操纵保存方法。

Inteface GenericRepository：

@NoRepositoryBean
public interface GenericRepository<T, ID extends Serializable> extends JpaRepository<T, ID> {
    <S extends T> S saveEntity(S entity);
}

Class GenericRepositoryFactory：

public class GenericRepositoryFactory extends JpaRepositoryFactory {

    /**
     * Creates a new {@link org.springframework.data.jpa.repository.support.JpaRepositoryFactory}.
     *
     * @param entityManager must not be {@literal null}
     */
    public GenericRepositoryFactory(EntityManager entityManager) {
        super(entityManager);
    }

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

Class GenericRepositoryFactoryBean：

public class GenericRepositoryFactoryBean<T extends JpaRepository<S, ID>, S, ID extends Serializable>
    extends JpaRepositoryFactoryBean<T, S, ID> {

    /**
     * Creates a new {@link JpaRepositoryFactoryBean} for the given repository interface.
     *
     * @param repositoryInterface must not be {@literal null}.
     */
    public GenericRepositoryFactoryBean(Class<? extends T> repositoryInterface) {
        super(repositoryInterface);
    }

    /**
     * Returns a {@link org.springframework.data.repository.core.support.RepositoryFactorySupport}.
     *
     * @param entityManager
     * @return
     */
    protected RepositoryFactorySupport createRepositoryFactory(EntityManager entityManager) {
        return new GenericRepositoryFactory(entityManager);
    }
}

Class GenericRepositoryImpl：

public class GenericRepositoryImpl<T, ID extends Serializable> extends SimpleJpaRepository<T, ID> implements GenericRepository<T, ID> {

    private JpaEntityInformation<T, Serializable> entityInformation;
    private final EntityManager entityManager;

    public GenericRepositoryImpl(JpaEntityInformation<T, Serializable> entityInformation, EntityManager entityManager) {
        super(entityInformation, entityManager);
        this.entityInformation = entityInformation;
        this.entityManager = entityManager;
    }


    @Override
    public T saveEntity(Object entity) {
        //here custom code...
        return null;
    }
}

使用我的通用存储库我的界面：

public interface SistemaMenuRepository extends GenericRepository<SistemaMenu, Integer> {
}

我的服务：

@Service
public class SistemaMenuService {
    @Autowired
    SistemaMenuRepository sistemaMenuRepository;
}

生成以下错误以运行应用程序：

org.springframework.beans.factory.UnsatisfiedDependencyException：创建名为'sistemaMenuService'的bean时出错：不满意通过字段'sistemaMenuRepository'表示的依赖关系;嵌套异常是org.springframework.beans.factory.BeanCreationException：创建名为'sistemaMenuRepository'的bean时出错：调用 init方法失败;嵌套异常是 org.springframework.data.mapping.PropertyReferenceException：没有找到类型SistemaMenu的属性saveEntity！

欢迎任何帮助！

Answer 1

根据Jens的建议，您需要指定自定义存储库工厂bean类。

@Configuration
@EnableJpaRepositories( basePackages = "repository.packagename",
                        entityManagerFactoryRef = "entityManagerFactory",
                        transactionManagerRef = "transactionManager",
                        repositoryFactoryBeanClass = GenericRepositoryFactoryBean.class)
@EnableTransactionManagement
public class JpaConfiguration {
...
}

自定义JpaRepository没有找到属性saveEntity

1 个答案: