java web开发入门三（Hibernate）基于intellig idea

Posted 2020-11-22

Hibernate

1.开发流程

项目配置好后的结构：

 

 

1.下载源码： 版本：hibernate-distribution-3.6.0.Final

2.引入hibernate需要的开发包（3.6版本），如果没有引用成功，在jar包上右键执行：add as library

 

3.编写实体对象及对象的映射xml文件

实体类：

package com.eggtwo.test;

import java.util.Date;

public class Student {
    private int  id;
    private String name;
    private int age;
    private Date birthday;
    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 int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }



}

 

数据库表结构：

 

 映射xml文件：（放在包下面）

<?xml version="1.0"?>
<!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.eggtwo.test">

    <class name="Student" table="student">
        <!-- 主键 ，映射-->
        <id name="id" column="id">
            <generator class="native"/>
        </id>
        <!-- 非主键，映射 -->
        <property name="name" column="name"></property>
        <property name="age" column="age"></property>
        <property name="birthday" column="birthday"></property>
    </class>

</hibernate-mapping>

 

4.配置主配置文件：src/hibernate.cfg.xml

<!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>
        <!-- 数据库连接配置 -->
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql:///test</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">123456</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>

        <property name="hibernate.show_sql">true</property>

        <!-- 加载所有映射 -->
        <mapping resource="com/eggtwo/test/Student.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

 

5.测试添加一条数据：

package com.eggtwo.test;
import java.util.Date;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.junit.Test;

public class TestApp {
    @Test
    public void testHello() throws Exception {
        // 创建对象：主键自增长
        Student s = new Student();
        s.setAge(12);
        s.setName("班长");
        s.setBirthday(new Date());

        // 获取加载配置文件的管理类对象
        Configuration config = new Configuration();
        config.configure();  // 默认加载src/hibenrate.cfg.xml文件
        // 创建session的工厂对象
        SessionFactory sf = config.buildSessionFactory();
        // 创建session (代表一个会话，与数据库连接的会话)
        Session session = sf.openSession();
        // 开启事务
        Transaction tx = session.beginTransaction();
        //保存-数据库
        session.save(s);
        // 提交事务
        tx.commit();
        System.out.println("save success");
        // 关闭
        session.close();
        sf.close();
    }

}

 

 

2.映射详解