The following operations are completed in the Junit test:
1. Create a new tool class to obtain SessionFactory and session, sample code:
package com.gx.util;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.cfg.Configuration;
public class HibernateSessionFactory {
private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
private static org.hibernate.SessionFactory sessionFactory;
private static Configuration configuration = new Configuration();
private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
private static String configFile = CONFIG_FILE_LOCATION;
static {
try {
configuration.configure(configFile);
sessionFactory = configuration.buildSessionFactory();
} catch (Exception e) {
System.err.println("%%%% Error Creating SessionFactory %%%%");
e.printStackTrace();
}
}
private HibernateSessionFactory() {
}
public static Session getSession() throws HibernateException {
Session session = (Session) threadLocal.get();
if (session == null || !session.isOpen()) {
if (sessionFactory == null) {
rebuildSessionFactory();
}
session = (sessionFactory != null) ? sessionFactory.openSession()
: null;
threadLocal.set(session);
}
return session;
}
public static void rebuildSessionFactory() {
try {
configuration.configure(configFile);
sessionFactory = configuration.buildSessionFactory();
} catch (Exception e) {
System.err.println("%%%% Error Creating SessionFactory %%%%");
e.printStackTrace();
}
}
public static void closeSession() throws HibernateException {
Session session = (Session) threadLocal.get();
threadLocal.set(null);
if (session != null) {
session.close();
}
}
public static org.hibernate.SessionFactory getSessionFactory() {
return sessionFactory;
}
public static void setConfigFile(String configFile) {
HibernateSessionFactory.configFile = configFile;
sessionFactory = null;
}
public static Configuration getConfiguration() {
return configuration;
}
}
2. Add data in Hibernate, sample code:
/*新增一定要开启事务*/
@Test
public void testInsert() throws ParseException{
//1获取session
Session session=HibernateSessionFactory.getSession();
//2获取事务
Transaction transaction=session.getTransaction();
//3开启事务
transaction.begin();
User user=new User();
user.setUsername("testInsert");
user.setPassword("123");
user.setSex(true);
user.setCreatetime(new Date());
user.setPowerid(1);
session.save(user);
//提交事务
transaction.commit();
//关闭session
session.close();
}
Screenshot of running result:
2. Modify the data
Hibernate modifies the data in 3 steps. Firstly, query the data that needs to be modified, then update the data, and finally save the modified data to the database. Sample code:
/*修改需要开启事务*/
@Test
public void testUpdate(){
//1获取session
Session session=HibernateSessionFactory.getSession();
//2获取事务
Transaction transaction=session.getTransaction();
//3开启事务
transaction.begin();
//查询需要修改的数据
User user=(User) session.get(User.class, 39);
//修改数据
user.setUsername("testUpdate");
//把修改后的数据保存到数据库
session.update(user);
transaction.commit();
//关闭session
session.close();
}
Screenshot of running result:
3. Delete data
There are two steps to delete data in Hibernate. First, query the data that needs to be modified, and then delete the data. Sample code:
/*删除需要开启事务*/
@Test
public void testDelete(){
//1获取session
Session session=HibernateSessionFactory.getSession();
//2获取事务
Transaction transaction=session.getTransaction();
//3开启事务
transaction.begin();
//查询需要删除的数据
User user=(User) session.get(User.class, 39);
//删除数据
session.delete(user);
transaction.commit();
session.close();
}
Screenshot of the running result, the data with id 39 has been deleted:
