hibernate框架

1、所需要架包

直接把hibernate中lib/required中的所有包放进去以及连接oracle数据库的架包。

2、写实现类（例如：标签类）

package com.chinasofti.ask.entity;

import java.util.HashSet;
import java.util.Set;

public class Tag {
   private String id; //主键id
   private String name; //标签名
   private int questionNums; //问题的数量

   public String getId() {
       return id;
   }
   public void setId(String id) {
       this.id = id;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public int getQuestionNums() {
       return questionNums;
   }
   public void setQuestionNums(int questionNums) {
       this.questionNums = questionNums;
   }

3、写hibernate.cfg.xml配置文件（放在src目录下）

<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>

<property name="connection.driver_class">
       oracle.jdbc.driver.OracleDriver
   </property>

    <property name="connection.url">
       jdbc:oracle:thin:@localhost:1521:ORCL
   </property>
   <property name="connection.username">jung</property>
   <property name="connection.password">jung</property>
   <property name="dialect">
       org.hibernate.dialect.Oracle12cDialect
   </property>

4、写Tag.hbm.xml配置文件（放在实体类包下）

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.chinasofti.ask.entity">
    <class name="Tag" table="t_tag">
        <id name="id">

5、写hibernate连接工具类

package com.chinasofti.ask.util;

import java.util.ArrayList;
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 HibernateUtil
{
    private static SessionFactory factory;

    static{
        Configuration configuration=new Configuration().configure();
        factory=configuration.buildSessionFactory();
    }

    public static SessionFactory getFactory()
    {
        return factory;
    }

    public static Session getSession()
    {
        Session session=HibernateUtil.getFactory().openSession();
        return session;
    }
    //增加
    public static <T> void add(T t)
    {
        Session session=getSession();
        Transaction transaction=session.beginTransaction();
        session.save(t);
        transaction.commit();
        session.close();
    }

   //修改

    public static <T> void update(T t) {
        Session session=getSession();
        Transaction transaction=session.beginTransaction();
        session.update(t);
        transaction.commit();
        session.close();
    }

    //删除

    public static <T> void delete(Class<T> c, String id)
    {
        Session session=getSession();
        Transaction transaction=session.beginTransaction();
        session.delete(session.get(c, id));
        transaction.commit();
        session.close();
    }

    //根据id查询

    public static <T> T query(Class<T> c, String id)
    {
        Session session=getSession();
        Transaction transaction=session.beginTransaction();
        T t=session.get(c, id);
        transaction.commit();
        session.close();
        return t;
    }

    //查询全部
    public static <T> List<T> queryAll(Class<T> c)
    {
        Session session=getSession();
        Transaction transaction=session.beginTransaction();
        List<T> list=session.createQuery("from "+c.getSimpleName()).list();
        transaction.commit();
        session.close();
        return list;
    }

}

6、写DAO层

package com.chinasofti.ask.dao;

import java.util.List;

import com.chinasofti.ask.entity.Tag;
import com.chinasofti.ask.util.HibernateUtil;

public class TagDao
{
    public void addTag(Tag tag)
    {
        HibernateUtil.add(tag);
    }

    public void updateTag(Tag tag)
    {
        HibernateUtil.update(tag);
    }

    public void deleteTag(String id)
    {
        HibernateUtil.delete(Tag.class,id);
    }

    public Tag queryTag(String id)
    {
        return HibernateUtil.query(Tag.class, id);
    }

    public List<Tag> queryAllTag()
    {
        return HibernateUtil.queryAll(Tag.class);
    }

}

7、写测试类（需要导入junit测试包）

package com.chinasofti.ask.test;

import java.util.List;
import org.junit.Before;
import org.junit.Test;

import com.chinasofti.ask.dao.TagDao;
import com.chinasofti.ask.entity.Tag;

public class TestTag
{
    private TagDao tagDao;

    @Before
    public void before()
    {
        tagDao=new TagDao();
    }

    @Test
    public void addTag()
    {
        Tag tag=new Tag();
       tag.setName("string");
       tag.setQuestionNums(2);

       tagDao.addTag(tag);

    }

    @Test
    public void deleteTag(){
        tagDao.deleteTag("2c848f9f555c031b01555c031f1f0000");

    }

    @Test
    public void update()
    {
        Tag tag=tagDao.queryTag("2c848f9f5558a9ec015558a9f2f60002");
        tag.setQuestionNums(3);

        tagDao.updateTag(tag);
    }

    @Test
    public void query()
    {
        Tag tag=tagDao.queryTag("2c848f9f5558a9ec015558a9f2f60002");
        System.out.println(tag.getName()+","+tag.getQuestionNums());

    }

    @Test
    public void queryAll()
    {
        List<Tag> list=tagDao.queryAllTag();
        for (Tag tag : list)
        {
            System.out.println(tag.getId()+","+tag.getName());
        }
    }
}

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