JPA学習(二)

15056 ワード 
package com.atguigu.jpa.test;

import java.util.Date;
import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import javax.persistence.Query;

import org.hibernate.ejb.QueryHints;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.atguigu.jpa.helloworld.Category;
import com.atguigu.jpa.helloworld.Customer;
import com.atguigu.jpa.helloworld.Department;
import com.atguigu.jpa.helloworld.Item;
import com.atguigu.jpa.helloworld.Manager;
import com.atguigu.jpa.helloworld.Order;

public class JPATest {

	private EntityManagerFactory entityManagerFactory;
	private EntityManager entityManager;
	private EntityTransaction transaction;
	
	@Before
	public void init(){
		entityManagerFactory = Persistence.createEntityManagerFactory("jpa-1");
		entityManager = entityManagerFactory.createEntityManager();
		transaction = entityManager.getTransaction();
		transaction.begin();
	}
	
	@After
	public void destroy(){
		transaction.commit();
		entityManager.close();
		entityManagerFactory.close();
	}
	
	//     JPQL    UPDATE   DELETE   . 
	@Test
	public void testExecuteUpdate(){
		String jpql = "UPDATE Customer c SET c.lastName = ? WHERE c.id = ?";
		Query query = entityManager.createQuery(jpql).setParameter(1, "YYY").setParameter(2, 12);
		
		query.executeUpdate();
	}

	//   jpql      
	@Test
	public void testJpqlFunction(){
		String jpql = "SELECT lower(c.email) FROM Customer c";
		
		List emails = entityManager.createQuery(jpql).getResultList();
		System.out.println(emails);
	}
	
	@Test
	public void testSubQuery(){
		//     Customer   lastName   YY   Order
		String jpql = "SELECT o FROM Order o "
				+ "WHERE o.customer = (SELECT c FROM Customer c WHERE c.lastName = ?)";
		
		Query query = entityManager.createQuery(jpql).setParameter(1, "YY");
		List orders = query.getResultList();
		System.out.println(orders.size());
	}
	
	/**
	 * JPQL        HQL      . 
	 */
	@Test
	public void testLeftOuterJoinFetch(){
		String jpql = "FROM Customer c LEFT OUTER JOIN FETCH c.orders WHERE c.id = ?";
		
		Customer customer = 
				(Customer) entityManager.createQuery(jpql).setParameter(1, 12).getSingleResult();
		System.out.println(customer.getLastName());
		System.out.println(customer.getOrders().size());
		
//		List result = entityManager.createQuery(jpql).setParameter(1, 12).getResultList();
//		System.out.println(result);
	}
	
	//   order      2     Customer
	@Test
	public void testGroupBy(){
		String jpql = "SELECT o.customer FROM Order o "
				+ "GROUP BY o.customer "
				+ "HAVING count(o.id) >= 2";
		List customers = entityManager.createQuery(jpql).getResultList();
		
		System.out.println(customers);
	}
	
	@Test
	public void testOrderBy(){
		String jpql = "FROM Customer c WHERE c.age > ? ORDER BY c.age DESC";
		Query query = entityManager.createQuery(jpql).setHint(QueryHints.HINT_CACHEABLE, true);
		
		//         1   
		query.setParameter(1, 1);
		List customers = query.getResultList();
		System.out.println(customers.size());
	}
	
	//   hibernate      . 
	@Test
	public void testQueryCache(){
		String jpql = "FROM Customer c WHERE c.age > ?";
		Query query = entityManager.createQuery(jpql).setHint(QueryHints.HINT_CACHEABLE, true);
		
		//         1   
		query.setParameter(1, 1);
		List customers = query.getResultList();
		System.out.println(customers.size());
		
		query = entityManager.createQuery(jpql).setHint(QueryHints.HINT_CACHEABLE, true);
		
		//         1   
		query.setParameter(1, 1);
		customers = query.getResultList();
		System.out.println(customers.size());
	}
	
	//createNativeQuery       SQL
	@Test
	public void testNativeQuery(){
		String sql = "SELECT age FROM jpa_cutomers WHERE id = ?";
		Query query = entityManager.createNativeQuery(sql).setParameter(1, 3);
		
		Object result = query.getSingleResult();
		System.out.println(result);
	}
	
	//createNamedQuery            @NamedQuery        
	@Test
	public void testNamedQuery(){
		Query query = entityManager.createNamedQuery("testNamedQuery").setParameter(1, 3);
		Customer customer = (Customer) query.getSingleResult();
		
		System.out.println(customer);
	}
	
	//     ,         ,      Object[]      .    Object[]     List.
	//                ,     JPQL                    .
	@Test
	public void testPartlyProperties(){
		String jpql = "SELECT new Customer(c.lastName, c.age) FROM Customer c WHERE c.id > ?";
		List result = entityManager.createQuery(jpql).setParameter(1, 1).getResultList();
		
		System.out.println(result);
	}
	
	@Test
	public void testHelloJPQL(){
		String jpql = "FROM Customer c WHERE c.age > ?";
		Query query = entityManager.createQuery(jpql);
		
		//         1   
		query.setParameter(1, 1);
		List customers = query.getResultList();
		System.out.println(customers.size());
	}
	
	@Test
	public void testSecondLevelCache(){
		Customer customer1 = entityManager.find(Customer.class, 1);
		
		transaction.commit();
		entityManager.close();
		
		entityManager = entityManagerFactory.createEntityManager();
		transaction = entityManager.getTransaction();
		transaction.begin();
		
		Customer customer2 = entityManager.find(Customer.class, 1);
	}
	
	//         ,           .
	//             ,                 , SQL     . 
	@Test
	public void testManyToManyFind(){
//		Item item = entityManager.find(Item.class, 5);
//		System.out.println(item.getItemName());
//		
//		System.out.println(item.getCategories().size());
		
		Category category = entityManager.find(Category.class, 3);
		System.out.println(category.getCategoryName());
		System.out.println(category.getItems().size());
	}
	
	//      
	@Test
	public void testManyToManyPersist(){
		Item i1 = new Item();
		i1.setItemName("i-1");
	
		Item i2 = new Item();
		i2.setItemName("i-2");
		
		Category c1 = new Category();
		c1.setCategoryName("C-1");
		
		Category c2 = new Category();
		c2.setCategoryName("C-2");
		
		//      
		i1.getCategories().add(c1);
		i1.getCategories().add(c2);
		
		i2.getCategories().add(c1);
		i2.getCategories().add(c2);
		
		c1.getItems().add(i1);
		c1.getItems().add(i2);
		
		c2.getItems().add(i1);
		c2.getItems().add(i2);
		
		//    
		entityManager.persist(i1);
		entityManager.persist(i2);
		entityManager.persist(c1);
		entityManager.persist(c2);
	}
	
	//1.      ,              ,                  . 
	//     @OneToOne   fetch          .         SQL             
	//              ,       fetch   . 
	@Test
	public void testOneToOneFind2(){
		Manager mgr = entityManager.find(Manager.class, 1);
		System.out.println(mgr.getMgrName());
		
		System.out.println(mgr.getDept().getClass().getName());
	}
	
	//1.     ,             ,                 . 
	//      @OntToOne   fetch          .
	@Test
	public void testOneToOneFind(){
		Department dept = entityManager.find(Department.class, 1);
		System.out.println(dept.getDeptName());
		System.out.println(dept.getMgr().getClass().getName());
	}
	
	//   1-1      ,                ,         ,        UPDATE   .
	@Test
	public void testOneToOnePersistence(){
		Manager mgr = new Manager();
		mgr.setMgrName("M-BB");
		
		Department dept = new Department();
		dept.setDeptName("D-BB");
		
		//      
		mgr.setDept(dept);
		dept.setMgr(mgr);
		
		//      
		entityManager.persist(mgr);
		entityManager.persist(dept);
	}
	
	@Test
	public void testUpdate(){
		Customer customer = entityManager.find(Customer.class, 10);
		
		customer.getOrders().iterator().next().setOrderName("O-XXX-10");
	}
	
	//     ,     1    ,         n         ,       . 
	//     @OneToMany   cascade             . 
	@Test
	public void testOneToManyRemove(){
		Customer customer = entityManager.find(Customer.class, 8);
		entityManager.remove(customer);
	}
	
	//                    . 
	//     @OneToMany   fetch             
	@Test
	public void testOneToManyFind(){
		Customer customer = entityManager.find(Customer.class, 9);
		System.out.println(customer.getLastName());
		
		System.out.println(customer.getOrders().size());
	}
	
	//     1-n      ,      
	//     n    ,     1    ,      ,     n   UPDATE   .
	//     1    ,      n   UPDATE   
	//      1-n      ,      n           ,   1          ,          SQL   . 
	//  :    1      @OneToMany     mappedBy   ,   @OneToMany         @JoinColumn    . 
	
	//   1-n          ,       UPDATE   .
	//   n                 . 
	@Test
	public void testOneToManyPersist(){
		Customer customer = new Customer();
		customer.setAge(18);
		customer.setBirth(new Date());
		customer.setCreatedTime(new Date());
		customer.setEmail("[email protected]");
		customer.setLastName("MM");
		
		Order order1 = new Order();
		order1.setOrderName("O-MM-1");
		
		Order order2 = new Order();
		order2.setOrderName("O-MM-2");
		
		//      
		customer.getOrders().add(order1);
		customer.getOrders().add(order2);
		
		order1.setCustomer(customer);
		order2.setCustomer(customer);
		
		//      
		entityManager.persist(customer);

		entityManager.persist(order1);
		entityManager.persist(order2);
	}
	
	/*
	@Test
	public void testManyToOneUpdate(){
		Order order = entityManager.find(Order.class, 2);
		order.getCustomer().setLastName("FFF");
	}
	
	//       1    ,        . 
	@Test
	public void testManyToOneRemove(){
//		Order order = entityManager.find(Order.class, 1);
//		entityManager.remove(order);
		
		Customer customer = entityManager.find(Customer.class, 7);
		entityManager.remove(customer);
	}
	
	//     ,              n             1       . 
	//    @ManyToOne   fetch                  
	@Test
	public void testManyToOneFind(){
		Order order = entityManager.find(Order.class, 1);
		System.out.println(order.getOrderName());
		
		System.out.println(order.getCustomer().getLastName());
	}
	*/
	
	/**
	 *       ,       1    ,     n    ,           UPDATE   .
	 */
	/*
	@Test
	public void testManyToOnePersist(){
		Customer customer = new Customer();
		customer.setAge(18);
		customer.setBirth(new Date());
		customer.setCreatedTime(new Date());
		customer.setEmail("[email protected]");
		customer.setLastName("GG");
		
		Order order1 = new Order();
		order1.setOrderName("G-GG-1");
		
		Order order2 = new Order();
		order2.setOrderName("G-GG-2");
		
		//      
		order1.setCustomer(customer);
		order2.setCustomer(customer);
		
		//      
		entityManager.persist(order1);
		entityManager.persist(order2);
		
		entityManager.persist(customer);
	}
	*/
	
	/**
	 *   hibernate   Session   refresh   . 
	 */
	@Test
	public void testRefresh(){
		Customer customer = entityManager.find(Customer.class, 1);
		customer = entityManager.find(Customer.class, 1);
		
		entityManager.refresh(customer);
	}
	
	/**
	 *   hibernate   Session   flush   . 
	 */
	@Test
	public void testFlush(){
		Customer customer = entityManager.find(Customer.class, 1);
		System.out.println(customer);
		
		customer.setLastName("AA");
		
		entityManager.flush();
	}
	
	//           ,         OID. 
	//1.    EntityManager          
	//2. JPA                EntityManager        .
	//3. EntityManager          UPDATE. 
	@Test
	public void testMerge4(){
		Customer customer = new Customer();
		customer.setAge(18);
		customer.setBirth(new Date());
		customer.setCreatedTime(new Date());
		customer.setEmail("[email protected]");
		customer.setLastName("DD");
		
		customer.setId(4);
		Customer customer2 = entityManager.find(Customer.class, 4);
		
		entityManager.merge(customer);
		
		System.out.println(customer == customer2); //false
	}
	
	//           ,         OID. 
	//1.    EntityManager         
	//2.              
	//3. JPA         ,              ,                       .
	//4.           update   . 
	@Test
	public void testMerge3(){
		Customer customer = new Customer();
		customer.setAge(18);
		customer.setBirth(new Date());
		customer.setCreatedTime(new Date());
		customer.setEmail("[email protected]");
		customer.setLastName("EE");
		
		customer.setId(4);
		
		Customer customer2 = entityManager.merge(customer);
		
		System.out.println(customer == customer2); //false
	}
	
	//           ,         OID. 
	//1.    EntityManager         
	//2.               
	//3. JPA          ,                       
	//4.           insert   . 
	@Test
	public void testMerge2(){
		Customer customer = new Customer();
		customer.setAge(18);
		customer.setBirth(new Date());
		customer.setCreatedTime(new Date());
		customer.setEmail("[email protected]");
		customer.setLastName("DD");
		
		customer.setId(100);
		
		Customer customer2 = entityManager.merge(customer);
		
		System.out.println("customer#id:" + customer.getId());
		System.out.println("customer2#id:" + customer2.getId());
	}
	
	/**
	 *     :     hibernate Session   saveOrUpdate   .
	 */
	//1.            
	//         ,                 ,               .   
	//       id,             id. 
	@Test
	public void testMerge1(){
		Customer customer = new Customer();
		customer.setAge(18);
		customer.setBirth(new Date());
		customer.setCreatedTime(new Date());
		customer.setEmail("[email protected]");
		customer.setLastName("CC");
		
		Customer customer2 = entityManager.merge(customer);
		
		System.out.println("customer#id:" + customer.getId());
		System.out.println("customer2#id:" + customer2.getId());
	}
	
	//    hibernate   Session   delete   .                
	//   :               .   hibernate   delete                .
	@Test
	public void testRemove(){
//		Customer customer = new Customer();
//		customer.setId(2);
		
		Customer customer = entityManager.find(Customer.class, 2);
		entityManager.remove(customer);
	}
	
	//    hibernate   save   .                . 
	//  hibernate   save        :      id,       insert   ,       . 
	@Test
	public void testPersistence(){
		Customer customer = new Customer();
		customer.setAge(15);
		customer.setBirth(new Date());
		customer.setCreatedTime(new Date());
		customer.setEmail("[email protected]");
		customer.setLastName("BB");
		customer.setId(100);
		
		entityManager.persist(customer);
		System.out.println(customer.getId());
	}
	
	//    hibernate   Session   load   
	@Test
	public void testGetReference(){
		Customer customer = entityManager.getReference(Customer.class, 1);
		System.out.println(customer.getClass().getName());
		
		System.out.println("-------------------------------------");
//		transaction.commit();
//		entityManager.close();
		
		System.out.println(customer);
	}
	
	//    hibernate   Session   get   . 
	@Test
	public void testFind() {
		Customer customer = entityManager.find(Customer.class, 1);
		System.out.println("-------------------------------------");
		
		System.out.println(customer);
	}

}
JPA RepositoryのPagingAndSortingRepository
JPA RepositoryのRepository