hibernate增删改查-入门

package com.ayali.test; import java.util.Iterator; import java.util.List; import org.hibernate.Criteria; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.Transaction; import org.junit.After; import org.junit.Before; import org.junit.Test; import com.ayali.pojo.User; import com.ayali.util.HibernateUtil; public class UserTest{ Session session = null; /** * 初始化资源 session */ @Before public void before(){ session = HibernateUtil.getSession(); } /** * 释放 session */ @After public void after(){ session.close(); } /** * 使用hibernate save() 方法 保存数据 */ @Test public void testSave(){ User user = new User(); user.setName("zhangsan"); user.setAge("33"); Transaction trans = session.beginTransaction(); session.save(user); trans.commit(); } /** * 批量 save User */ @Test public void testSaveUsers(){ for(int i=0; i<5; i++){ User user = new User(); user.setName("zhangsan-"+i); session.save(user); } Transaction trans = session.beginTransaction(); trans.commit(); } /** * 使用 hibernate update() 更新数据 */ @Test public void testUpdate(){ User user = (User) session.get(User.class, 1); user.setAge("22"); Transaction trans = session.beginTransaction(); session.save(user); trans.commit(); } /** * 使用 hibernate delete() 删除数据 * * 只能通过 id 删除 */ @Test public void testDelete(){ User user = new User(); user.setId(1); Transaction trans = session.beginTransaction(); session.delete(user); trans.commit(); } /** * 使用 hibernate 查询数据 */ @Test public void testSelect(){ //使用 hql 查询 String hql = "from User "; Query query = HibernateUtil.getSession().createQuery(hql); List list = query.list(); for(int i=0; i<list.size(); i++){ User user = (User)list.get(i); System.out.println(user.getName()); } //使用 Criteria 查询 // Criteria criteria = HibernateUtil.getSession().createCriteria(User.class); // // List<User> list = criteria.list();; // for(Iterator<User> it = list.iterator();it.hasNext();){ // User user = (User)it.next(); // System.out.println(user.getName()); // } } }