Hibernate入门

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1。导包：
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2。实体类：Person.java文件：

package com.itheima.domain;import java.io.Serializable;/*create database day22;use day22;create table PERSONS(    ID int primary key,    NAME varchar(255)); */public class Person implements Serializable {    private Integer id;    private String name;    public Person() {        super();    }    public Person(Integer id, String name) {        super();        this.id = id;        this.name = name;    }    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }}

3。映射文件：Person.hbm.xml文件：

<?xml version="1.0" encoding="UTF-8"?><!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.itheima.domain">    <class name="Person" table="PERSONS">        <id name="id" column="ID">            <generator class="native"></generator>        </id>        <property name="name" column="NAME"></property>    </class></hibernate-mapping>

4。Hibernate配置文件，hibernate.cfg.xml文件：

<?xml version="1.0" encoding="UTF-8"?><!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>        <!-- 配置Hibernate:属性配置参考  Hibernate发型包\project\etc\hibernate.properties -->        <!-- JDBC的基本链接 -->        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>        <property name="connection.username">root</property>        <property name="connection.password">admin</property>        <property name="connection.url">jdbc:mysql://localhost:3306/day22</property>        <!-- 配置数据库方言 -->        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>        <!-- 根据映射产生表结构的类型:            create-drop:木有表结构创建，下次启动时删除重新创建。适合学习阶段            create：只做创建            update：探测表结构够的变化，对于数据库没有的，进行更新操作。适合学习阶段            validate：对比与数据库的结构         -->        <property name="hibernate.hbm2ddl.auto">update</property>        <!-- 自动开启事务 --><!--        <property name="hibernate.connection.autocommit">true</property> -->        <!-- 显示sql语句及格式：开发调试阶段非常有用 -->        <property name="hibernate.show_sql">true</property>        <!-- 告知映射文件 -->        <mapping resource="com/itheima/domain/Person.hbm.xml"/>    </session-factory></hibernate-configuration>

5。获取session对象的工具类，HibernateUtil.java文件：

package com.itheima.util;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;public class HibernateUtil {    private static SessionFactory sessionFactory;    static {        Configuration cfg = new Configuration().configure();        sessionFactory = cfg.buildSessionFactory();    }    public static Session getSession(){        return sessionFactory.openSession();    }}

6。测试类，CRUDDemo.java文件：

package com.itheima.test;import org.hibernate.Session;import org.hibernate.Transaction;import org.junit.Test;import com.itheima.domain.Person;import com.itheima.util.HibernateUtil;public class CRUDDemo {    @Test    public void testAdd(){        Person p = new Person();        p.setId(1);        p.setName("杨洋");        Session s = HibernateUtil.getSession();        Transaction tx = s.beginTransaction();        s.save(p);        tx.commit();        s.close();    }    @Test    public void testFind(){        Session s = HibernateUtil.getSession();        Person p = (Person) s.get(Person.class, 1);        System.out.println(p);        s.close();    }    @Test    public void testUpdate(){        Session s = HibernateUtil.getSession();        Transaction tx = s.beginTransaction();        Person p = (Person) s.get(Person.class, 1);        p.setName("范青霞");        s.update(p);        tx.commit();        s.close();    }    @Test    public void testDelete(){        Session s = HibernateUtil.getSession();        Transaction tx = s.beginTransaction();        Person p = (Person) s.get(Person.class, 1);        s.delete(p);        tx.commit();        s.close();    }}

7。测试结果：

log4j:WARN No appenders could be found for logger (org.hibernate.type.BasicTypeRegistry).log4j:WARN Please initialize the log4j system properly.log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.Hibernate: insert into PERSONS (NAME) values (?)

log4j:WARN No appenders could be found for logger (org.hibernate.type.BasicTypeRegistry).log4j:WARN Please initialize the log4j system properly.log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.Hibernate: select person0_.ID as ID0_0_, person0_.NAME as NAME0_0_ from PERSONS person0_ where person0_.ID=?com.itheima.domain.Person@16c9b8c

log4j:WARN No appenders could be found for logger (org.hibernate.type.BasicTypeRegistry).log4j:WARN Please initialize the log4j system properly.log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.Hibernate: select person0_.ID as ID0_0_, person0_.NAME as NAME0_0_ from PERSONS person0_ where person0_.ID=?Hibernate: update PERSONS set NAME=? where ID=?

log4j:WARN No appenders could be found for logger (org.hibernate.type.BasicTypeRegistry).log4j:WARN Please initialize the log4j system properly.log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.Hibernate: select person0_.ID as ID0_0_, person0_.NAME as NAME0_0_ from PERSONS person0_ where person0_.ID=?Hibernate: delete from PERSONS where ID=?

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