Spring Data JPA用户自定义repository查询

今天药忘吃喽~ 2021-12-07 12:55 282阅读 0赞

用户可以通过SpringData JPA底层的hibernate jpa的entityManagerFactory来自己实现repository，在相应的dao接口继承自己定义的接口，并在相应的daoImpl对该repository进行实现  
下面为自定义的一个repository  
UsersRepositroy.java

package per.czt.dao;
    
    import per.czt.pojo.Users;
    
    public interface UsersRepository {
    	public Users findUserById(Integer userid);
    
    }

在UsersDao继承该接口  
UsersDao.java

package per.czt.dao;
    
    
    
    import org.springframework.data.jpa.repository.JpaRepository;
    import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
    import per.czt.pojo.Users;
    
    public interface UsersDao extends JpaRepository<Users, Integer>,JpaSpecificationExecutor<Users>,UsersRepository {
    	
    }

在UsersDaoImpl对该接口实现  
UsersDaoImpl.java

package per.czt.dao.impl;
    
    
    
    import javax.persistence.EntityManager;
    import javax.persistence.PersistenceContext;
    
    
    import per.czt.dao.UsersRepository;
    import per.czt.pojo.Users;
    
    public class UsersDaoImpl implements UsersRepository {
    
    	@PersistenceContext(name="entityManagerFactory")
    	private EntityManager em;
    	
    
    	@Override
    	public Users findUserById(Integer userid) {
    		// TODO Auto-generated method stub
    		return em.find(Users.class, userid);
    	}
    
    }

Junit测试类  
UsersRepositoryTest.java

package per.czt.test;
    
    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 per.czt.dao.UsersDao;
    import per.czt.pojo.Users;
    @RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration("classpath:applicationContext.xml")
    public class UsersRepositoryTest {
    	@Autowired
    	private UsersDao usersDao;
    	
    	@Test
    	public void test1() {
    		Users users=usersDao.findUserById(2);
    		System.out.println(users);
    	}
    	
    
    }