实现hibernate的增删查改。

来源:互联网 发布:killer lady动作数据 编辑:程序博客网 时间:2024/03/29 16:01
1.增,增在SQL里面就是insert,也就是插入,在hibernate中,只需要,操纵一个对象进行sava,然后再commit事务,就能实现插入功能,持久类就不再写了,里面也就是与数据库中的字段要一一对应的东西,要有set,get方法,我直接就写的怎么调用save方法。 
//导入所需的包 
import org.hibernate.HibernateException; 
import org.hibernate.Session; 
import org.hibernate.SessionFactory; 
import org.hibernate.Transaction; 
import org.hibernate.cfg.Configuration; 
public class UserTest { 
public static void main(String args[]){ 
Configuration cfg = new Configuration().configure(); //获取hibernate的配置信息 
SessionFactory sf = cfg.buildSessionFactory(); //根据config建立sessionFactory 
Session ses = sf.openSession(); //factory用于建立session,开启Session,相当于开启JDBC的Connection 
Transaction ts = ses.beginTransaction(); //创建事务的对象ts 
User user = new User(); //持久化对象 
user.setName("kobe"); 
user.setTel("111111111"); 
try { 
ses.save(user); 
ts.commit(); 
}catch (HibernateException he){ 
he.printStackTrace(); 
ts.rollback(); 
}finally{ 
ses.close(); 
sf.close(); 
System.out.println("插入成功"); 



2.删,删在SQL里面是delete,也就是删除,同样在hibernate中,我们也是只需要调用一个对象,调用delete方法,就能进行删除。 
import org.hibernate.HibernateException; 
import org.hibernate.Session; 
import org.hibernate.SessionFactory; 
import org.hibernate.Transaction; 
import org.hibernate.cfg.Configuration; 
public class DeleteTest { 
public static void main(String args[]){ 
Configuration cfg = new Configuration().configure(); 
SessionFactory sf = cfg.buildSessionFactory(); 
Session ses = sf.openSession(); 
Transaction ts = ses.beginTransaction(); 
User user = new User(); 
user.setId("8a8308891e9c3ef3011e9c3ef4aa0001"); 
try { 
ses.delete(user); 
ts.commit(); 
}catch (HibernateException he){ 
he.printStackTrace(); 
ts.rollback(); 
}finally{ 
ses.close(); 
sf.close(); 
System.out.println("删除成功"); 



 3.改,改在SQL中update,在hibernate中,我们同样只需要操作一个对象进行更改信息。 
import org.hibernate.HibernateException; 
import org.hibernate.Session; 
import org.hibernate.SessionFactory; 
import org.hibernate.Transaction; 
import org.hibernate.cfg.Configuration; 
public class UpdateTest { 
public static void main(String args[]){ 
Configuration cfg = new Configuration().configure(); 
SessionFactory sf = cfg.buildSessionFactory(); 
Session ses = sf.openSession(); 
Transaction ts = ses.beginTransaction(); 
User user = new User(); 
user.setId("8a8308891e9c3ef3011e9c3ef4aa0001"); 
user.setName("kobe24"); 
try { 
ses.update(user); 
ts.commit(); 
}catch (HibernateException he){ 
he.printStackTrace(); 
ts.rollback(); 
}finally{ 
ses.close(); 
sf.close(); 
System.out.println("更改成功"); 




Session ses = sf.openSession(); 
Transaction ts = ses.beginTransaction(); 
User user = (User)ses.get(User.class,"8a8308891e9c3ef3011e9c3ef4aa0001"); 
user.setName("kobe24"); 
try { 
ses.update(user); 
ts.commit(); 
 
4.查,查在SQL中是select,在hibernate中我们查询的时候有多种方法,就是HQL。用这个方法时候需要注意的是他其中的from跟的不是表名,而是类名。 
package hibernate; 
import java.util.Iterator; 
import java.util.List; 
import org.hibernate.Query; 
import org.hibernate.Session; 
import org.hibernate.SessionFactory; 
import org.hibernate.Transaction; 
import org.hibernate.cfg.Configuration; 
public class SeleteTest { 
public static void main(String args[]){ 
Configuration cfg=new Configuration().configure(); 
SessionFactory sf=cfg.buildSessionFactory(); 
Session ses=sf.openSession(); 
Transaction tx=ses.beginTransaction(); 
User user = new User(); 
Query query = ses.createQuery("from User"); 
List users = query.list(); //序列化 
Iterator it = users.iterator(); //迭代 
while (it.hasNext()){ 
user = (User) it.next(); 
System.out.println(user.getName()+" "+user.getTel()+" "); 

ses.close(); 
sf.close(); 

}
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