hibernate helloword程序建立

時間 2019-12-07

標籤 hibernate helloword 程序建立欄目 Hibernate 简体版

原文原文鏈接

一建立dao層mysql

public class User {
    private int id;
    private String name;
    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;
    }

    @Override
    public String toString() {
        return "[User:id="+id+",name"+name+"]";
    }

}sql

二導入jar包數據庫

三配置xml文件 session

<!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="dialect">org.hibernate.dialect.MySQL5Dialect</property>
        <property name="connection.url">jdbc:mysql://192.168.10.227:3309/hibernate_20160815</property>
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.username">root</property>
        <property name="connection.password">000000</property>

        
        <property name="show_sql">true</property>
        <property name="format_sql">false</property>app

<property name="hibernate.hbm2ddl.auto">update</property>


        
        <mapping resource="cn/itcast/a_helloword/User.hbm.xml"/>


    </session-factory>
</hibernate-configuration>ide

四映射配置文件ui

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

    <class name="cn.itcast.a_helloword.User" table="user">
        <id name="id" type="int" column="id">
            <generator class="native"></generator>
        </id>
        <property name="name" type="string" column="name"></property>
    </class>

</hibernate-mapping>this

五應用層url

Java Code spa

package cn.itcast.a_helloword;

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

public class App {

    public static SessionFactory sessionFactory;

    static {

// 讀取配置文件並生成Session工廠對象

Configuration cfg = new Configuration();

// cfg.configure("hibernate.cfg.xml"); // 加載指定的配置文件

// cfg.configure(); // 讀取默認的配置文件（hibernate.cfg.xml）

// cfg.addResource("cn/itcast/a_helloworld/User.hbm.xml");

// cfg.addClass(User.class); //

// sessionFactory = cfg.buildSessionFactory();

sessionFactory = new Configuration()//

.configure()//

.addClass(User.class)// 加載指定類對應的映射文件（以類名爲前綴，後綴爲.hbm.xml的同一個包下的文件）

.buildSessionFactory();

    }

    //保存對象到數據庫
    @Test
    public void testSave() throws Exception {
     //準備對象
        User user = new User();
        user.setName("張三");
    //保存到數據庫中
      Session session = sessionFactory.openSession();
      Transaction tx = session.beginTransaction();
      session.save(user);//保存
      tx.commit();
      session.close();
    }


    //從數據庫中獲取一條數據
    @Test
    public void testGet() throws Exception {
          Session session = sessionFactory.openSession();
          Transaction tx = session.beginTransaction();
          User user = (User) session.get(User.class,1);//保存
          tx.commit();
          session.close();

          System.out.println(user);//顯示信息     } }

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