springboot2.1 之 JPA自定義BaseRepository

BaseRepository 定義接口

@NoRepositoryBean
public interface BaseRepository<T,ID extends Serializable> extends JpaRepository<T,ID>  {
	/**
	 *  傳入SQL查詢語句 返回結果集
	 * @param sql語句 
	 * @return	 List 的 數據集  Object[] 結果根據sql 映射的順序
	 */
	 List<Object[]> listBySQL(String sql);
	 
}

BaseRepositoryImpl 定義實現

public class BaseRepositoryImpl<T, ID extends Serializable> extends SimpleJpaRepository<T,ID> implements BaseRepository<T,ID> {

	private final EntityManager entityManager;
		BaseRepositoryImpl(JpaEntityInformation<T, ID> entityInformation,
	            EntityManager entityManager) {
	super(entityInformation, entityManager);
	this.entityManager = entityManager;
		}
		
	@SuppressWarnings("unchecked")
	@Override
	public List<Object[]> listBySQL(String sql) {
		  return entityManager.createNativeQuery(sql).getResultList();
	}

}

BaseRepositoryFactoryBean ：repository裝載工廠重寫

public class BaseRepositoryFactoryBean<T extends  JpaRepository<S, ID>, S, ID extends Serializable> extends  JpaRepositoryFactoryBean<T, S, ID>{
	public BaseRepositoryFactoryBean(Class<? extends T> repositoryInterface) {
		super(repositoryInterface);
	}
		    	@Override
		        protected RepositoryFactorySupport createRepositoryFactory(EntityManager em) {
		            return new BaseRepositoryFactory(em);
		        }
				// 用內部類完成工廠
			    private static class BaseRepositoryFactory<T, I extends Serializable>
			            extends JpaRepositoryFactory {
			
			        private final EntityManager em;
			
			        public BaseRepositoryFactory(EntityManager em) {
			            super(em);
			            this.em = em;
			        }
			
			        //設置=實現類是BaseRepositoryImpl
			        @Override
			        protected JpaRepositoryImplementation<?, ?> getTargetRepository(RepositoryInformation information, EntityManager entityManager) {
			            JpaEntityInformation<?, Serializable> entityInformation = this.getEntityInformation(information.getDomainType());
			            Object repository = this.getTargetRepositoryViaReflection(information, new Object[]{entityInformation, entityManager});
			            Assert.isInstanceOf(BaseRepositoryImpl.class, repository);
			            return (JpaRepositoryImplementation)repository;
			        }
			
			        //設置自定義實現類class
			        @Override
			        protected Class<?> getRepositoryBaseClass(RepositoryMetadata metadata) {
			            return BaseRepositoryImpl.class;
			        }
    }
}

最後一步是使Spring Data Infrastructure瞭解自定義存儲庫基類。在Java配置中，您可以使用註釋的repositoryBaseClass屬性來執行此操作@Enable${store}Repositories，如以下示例所示：

@ComponentScan
@Configuration
@EnableJpaRepositories(basePackages = {"com.example.demo.repository"},repositoryFactoryBeanClass = BaseRepositoryFactoryBean.class)//指定自己的工廠類
public class ApplicationConfig {}

（2）或者使用XML配置自定義存儲庫基類

<?xml version="1.0" encoding="UTF-8"?>
<beans:beans xmlns:beans="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns="http://www.springframework.org/schema/data/jpa"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/data/jpa
    http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">

	<repositories base-package=" 路徑" factory-class="類名 "></repositories>
</beans:beans>

官方文檔：https://docs.spring.io/spring-data/jpa/docs/2.1.3.RELEASE/reference/html/