Spring data 接口之 自定义Repository 接口

虽然说spring data 提供了很多DAO 接口，但是依然可能不能满足我们日常的使用，所以，有时我们需要自定义接口方法。自定义接口方法步骤如下：

1.  创建自定义工厂类：CustomerJpaRepositoryFactoryBean， 需要继承JpaRepositoryFactoryBean

package org.zgf.spring.data.customer;import java.io.Serializable;import javax.persistence.EntityManager;import org.springframework.data.jpa.repository.support.JpaRepositoryFactory;import org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean;import org.springframework.data.repository.Repository;import org.springframework.data.repository.core.RepositoryMetadata;import org.springframework.data.repository.core.support.RepositoryFactorySupport;/** *  自定义工厂 * @author: zonggf * @date: 2016年1月18日-下午2:16:18 */public class CustomerJpaRepositoryFactoryBean<T extends Repository<S, ID>, S, ID extends Serializable>extends JpaRepositoryFactoryBean<T, S, ID> {@Overrideprotected RepositoryFactorySupport createRepositoryFactory(EntityManager entityManager) {return new CustomerRepositoryFactory(entityManager);}private static class CustomerRepositoryFactory<T, I extends Serializable> extends JpaRepositoryFactory {private EntityManager entityManager;public CustomerRepositoryFactory(EntityManager entityManager) {super(entityManager);this.entityManager = entityManager;}protected Object getTargetRepository(RepositoryMetadata metadata) {return new IBaseDaoImpl<T, I>((Class<T>) metadata.getDomainType(), entityManager);}protected Class<?> getRepositoryBaseClass(RepositoryMetadata metadata) {return IBaseDao.class;}}}

2. 创建自定义接口：IBaseDao， 需要继承JpaRepository

package org.zgf.spring.data.customer;import java.io.Serializable;import org.springframework.data.jpa.repository.JpaRepository;import org.springframework.data.repository.NoRepositoryBean;//必须使用该注解标明，此接口不是一个Repository Bean@NoRepositoryBeanpublic interface IBaseDao <T, ID extends Serializable> extends JpaRepository<T, ID>{//自定义接口方法public void sayHello(String name);}

3. 创建自定义接口实现 类：IBaseDaoImpl， 名称必须是 接口名+ Impl

package org.zgf.spring.data.customer;import java.io.Serializable;import javax.persistence.EntityManager;import org.springframework.data.jpa.repository.support.SimpleJpaRepository;import org.springframework.data.repository.NoRepositoryBean;//必须使用该注解标明，此接口不是一个Repository Bean@NoRepositoryBeanpublic class IBaseDaoImpl<T, ID extends Serializable> extends SimpleJpaRepository<T, ID>implements IBaseDao<T, ID> {private EntityManager entityManager;public IBaseDaoImpl(Class<T> domainClass, EntityManager em) {super(domainClass, em);this.entityManager = em;}@Overridepublic void sayHello(String name) {System.out.println("entityManage:" + entityManager);System.out.println("hello, " + name);}}

4. 配置文件中配置自定义工厂类：

        <!-- 5. 配置 SpringData --><!-- 加入  jpa 的命名空间   扫描 Repository Bean 所在的 package, 自定义工厂类 --><jpa:repositories base-package="org.zgf.spring.data" entity-manager-factory-ref="entityManagerFactory" factory-class="org.zgf.spring.data.customer.CustomerJpaRepositoryFactoryBean"/>

5. 测试类：

package org.zgf.spring.data.customer;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;import org.springframework.test.context.transaction.TransactionConfiguration;@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(locations = { "classpath*:/applicationContext-customer-jpa.xml" })@TransactionConfiguration(transactionManager = "transactionManager", defaultRollback = false)public class Test_CustomerStudentDao {@Autowired private StudentBaseDao studentDao;@Testpublic void test(){this.studentDao.sayHello("zong");}}