Hibernate的使用梳理

Hibernate创建步骤

（五大核心接口：Configuration/SessionFactory/Session/Transaction/Query）

1.新建java工程，导入需要的jar包。

2.创建hibernate.cfg.xml配置文件和Test.java工具类。配置好相应的实体对象User.java  User.hbm.xml 生成的主要内容如下：

3.导入mysql的jar包 mysql-connector-java-5.1.7-bin.jar

hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC"-//Hibernate/Hibernate Configuration DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration><session-factory><property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property><property name="hibernate.connection.url">jdbc:mysql://127.0.0.1:3306/hib</property><property name="hibernate.connection.username">root</property><property name="hibernate.connection.password">admin</property><property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property><property name="hibernate.show_sql">true</property><property name="show_sql">true</property><property name="hibernate.hbm2ddl.auto">create</property><mapping resource="com/entity/User.hbm.xml"/></session-factory>
</hibernate-configuration>

Test.java

package javaHibernateDemo;import org.hibernate.HibernateException;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;
import com.entity.User;public class Test {public static void main(String[] args) {//通过Configuration调用 configure方法 去查找  项目中classpath下hibernate.cfg.xml文件//通过hibernate.cfg.xml文件中的信息 创造sessionfactorySessionFactory factory = new Configuration().configure().buildSessionFactory();//SessionFactory 制造session 类似与JDBC中的连接，通过session可以访问数据库Session session = factory.openSession();Transaction tx = session.beginTransaction();// 开启事务try {User user = new User();// 造对象user.setAge(34);user.setName("litiang");user.setPassword("123456");session.save(user);// 把对象保存到数据库
tx.commit();// 提交事务} catch (HibernateException e) {if (null != tx)tx.rollback();} finally {session.close();}}
}

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.entity.User" table="User"><id name="id" column="ID" type="java.lang.Integer"><generator class="native" /></id><property name="name" column="name" type="java.lang.String" /><property name="password" column="password" type="java.lang.String" /><property name="age" column="age" type="java.lang.Integer" /></class>
</hibernate-mapping>

User.java

package com.entity;public class User {private int id;private String name;private String password;private int age;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}
}