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sessionfactory
        SessionFactory 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;
    }
}