hibernate的增删改操作

6.CUD操作

工具类

public class ConfigUtil {
public static SessionFactory sessionFactory;
static{
Configuration configuration = new Configuration();
configuration.configure();
sessionFactory = configuration.buildSessionFactory();
}
}

public class PersonTest extends ConfigUtil{
@Test
public void testQueryPerson(){
Session session = sessionFactory.openSession();
List<Person> personList = session.createQuery("from Person").list();
for(Person person:personList){
System.out.println(person.getPname());
}
session.close();
}

@Test
public void testQueryPersonByID(){
Session session = sessionFactory.openSession();
/**
* 按照主键的方式查询数据库表中的记录
* 第二个参数的类型必须和持久化中标示符的类型保持一致
*/
Person person = (Person)session.get(Person.class, 1L);
System.out.println(person.getPname());
session.close();
}

/**
* hibernate内部会检查标示符，看标示符中的值在数据库相应的表中有没有对应的记录，如果有，则删除
*/
@Test
public void testDeletePerson(){
Session session = sessionFactory.openSession();
Transaction transaction = session.beginTransaction();
/**
* 1、根据id把值从数据库中查找出来
* 2、把对象删除掉
*/
//Person person = (Person)session.get(Person.class, 1L);
//session.delete(person);

/**
* 1、新创建一个person对象
* 2、给person对象的标示符赋值
* 3、调用session.delete方法删除
*/
Person person = new Person();
//person.setPid(2L);
session.delete(person);
transaction.commit();
session.close();
}

@Test
public void testUpdatePerson(){
Session session = sessionFactory.openSession();
Transaction transaction = session.beginTransaction();

/**
* 1、根据id把持久化对象提取出来
* 2、进行修改
* 3、执行upate操作
*/
Person person = (Person)session.get(Person.class, 1L);
person.setPsex("不详");
//Person person = new Person();
//person.setPid(1L);
session.update(person);
transaction.commit();
session.close();
}
}