JAVAWEB 一一 Hibernate（框架)

实体类关联数据库字段，操作实体类,HQL语句对数据结构CRUD）

引入jar包

配置文件

hibernate.cfg.xml

User.hbm.xml

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
    <class name="com.book.entity.User" table="USER_NEW">
        <id name="userid" type="java.lang.Integer">
            <column name="USERID" />
            <generator class="sequence">
                <param name="sequence">SEQ_ID</param>
            </generator>
        </id>
        <property name="username" type="java.lang.String">
            <column name="USERNAME"/>
        </property>
        <property name="userpassword" type="java.lang.String">
            <column name="USERPASSWORD" length="50" not-null="true" />
        </property>
        <property name="role" type="java.lang.Integer">
            <column name="ROLE"/>
        </property>
        <property name="state" type="java.lang.Integer">
            <column name="STATE"/>
        </property>
        <property name="email" type="java.lang.String">
            <column name="EMAIL"/>
        </property>
        <property name="createdate" type="java.util.Date">
            <column name="CREATEDATE"/>
        </property>
    </class>
</hibernate-mapping>

　　增

package com.book.test;

import java.util.Date;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

import com.book.entity.User;

public class AddTest {
	public static void main(String[] args) {
		Configuration conf = null;
		SessionFactory sessionFactory =null;
		Session session = null;
		Transaction tx = null;
		try {
			//解析配置文件
			conf = new Configuration().configure();
			//创建解析工厂
			sessionFactory= conf.buildSessionFactory();
			//打开session
			session = sessionFactory.openSession();
			//开启事务
			tx = session.beginTransaction();
			//创建对象
			User user = new User("Tom","adsf123",0,0,"sdsad@qq.com",new Date());
			//增   添加数据
			session.save(user);
			//提交
			tx.commit();
		} catch (HibernateException e) {
			//回滚
			tx.rollback();
			e.printStackTrace();
		}finally{
			if(session!=null){
			session.close();
			}
			if(sessionFactory!=null){
			sessionFactory.close();
			}
		}
	}
}

　　删

package com.book.test;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

import com.book.entity.User;

public class DelTest {
	public static void main(String[] args) {
		Configuration conf = null;
		SessionFactory sessionFactory =null;
		Session session = null;
		Transaction tx = null;
		try {
			//解析配置文件
			conf = new Configuration().configure();
			//创建解析工厂
			sessionFactory= conf.buildSessionFactory();
			//打开session
			session = sessionFactory.openSession();
			//开启事务
			tx = session.beginTransaction();
			//先查 后删除 load和get一样
			User user =(User) session.load(User.class, 45);
			session.delete(user);

			//提交
			tx.commit();
		} catch (HibernateException e) {
			tx.rollback();
			e.printStackTrace();
		}finally{
			if(session!=null){
			session.close();
			}
			if(sessionFactory!=null){
			sessionFactory.close();
			}
		}
	}
}

　　改

package com.book.test;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

import com.book.entity.User;

public class UpdateTest {
	public static void main(String[] args) {
		Configuration conf = null;
		SessionFactory sessionFactory =null;
		Session session = null;
		Transaction tx = null;
		try {
			//解析配置文件
			conf = new Configuration().configure();
			//创建解析工厂
			sessionFactory= conf.buildSessionFactory();
			//打开session
			session = sessionFactory.openSession();
			//开启事务
			tx = session.beginTransaction();
			//先查 后改
			User user =(User) session.load(User.class, 45);
			user.setEmail("504177380@qq.com");

			session.update(user);
			//提交
			tx.commit();
		} catch (HibernateException e) {
			tx.rollback();
			e.printStackTrace();
		}finally{
			if(session!=null){
			session.close();
			}
			if(sessionFactory!=null){
			sessionFactory.close();
			}
		}
	}
}

　　查

package com.book.test;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

import com.book.entity.User;

public class QueryTest {
	public static void main(String[] args) {

		Configuration conf = null;
		SessionFactory sessionFactory =null;
		Session session = null;

		try {
			//解析配置文件
			conf = new Configuration().configure();
			//创建解析工厂
			sessionFactory= conf.buildSessionFactory();
			//打开session
			session = sessionFactory.openSession();

			//查  查不涉及 事务
			User user =(User) session.load(User.class, 45);
			System.out.println(user.getUserpassword()+"  "+user.getUsername());

		} catch (HibernateException e) {

			e.printStackTrace();
		}finally{
			if(session!=null){
			session.close();
			}
			if(sessionFactory!=null){
			sessionFactory.close();
			}
		}
	}

}

　　测试HQL语句

package com.book.test;

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

import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

import com.book.entity.User;

public class TestHql {
	public static void main(String[] args) {
		Configuration conf = null;
		SessionFactory sessionFactory =null;
		Session session = null;

		try {
			//解析配置文件
			conf = new Configuration().configure();
			//创建解析工厂
			sessionFactory= conf.buildSessionFactory();
			//打开session
			session = sessionFactory.openSession();

			Query query = session.createQuery("from User where userid =?");
		    query.setInteger(0, 45);
		    //分页查询
		    int pageIndex=2;
		    int pageSize=10;
		    query.setFirstResult((pageIndex-1)*pageSize);
		    query.setMaxResults(pageSize);
		    List<User>list = query.list();

		    //单个对象
		    User user1 = (User)query.uniqueResult();
		    //多个对象的结果集
			List<User> list1 =query.list();

			for(int i=0;i<list.size();i++){
				int userid = list.get(i).getUserid();
				System.out.println(userid);
			}

			//创建对象
			User user = new User("Tom","adsf123",0,0,"sdsad@qq.com",new Date());
			//增   添加数据
			session.save(user);
			//提交

		} catch (HibernateException e) {

			e.printStackTrace();
		}finally{
			if(session!=null){
			session.close();
			}
			if(sessionFactory!=null){
			sessionFactory.close();
			}
		}
	}
}