工程截图



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>

        <!-- 必须配置的属性 -->

        <!-- 连接数据库信息 -->

        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>

        <property name="connection.url">jdbc:mysql:///hibernate</property>

        <property name="connection.username">root</property>

        <property name="connection.password">admin</property>

        <!-- 方言属性：这个是实现跨数据库关键类 -->

        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

        <!-- 可选配置属性 -->

        <!-- 是否自动生成表：这里选用create便于测试 -->

        <property name="hbm2ddl.auto">create</property>

        <!-- 是否显示sql -->

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

        <!-- 是否格式化sql -->

        <!-- <property name="format_sql">true</property> -->

        <!-- 以文件路径的方式加载映射文件 -->

        <mapping resource="com/jege/hibernate/single/table/User.hbm.xml" />

    </session-factory>

</hibernate-configuration>

User.hbm.xml

<?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">

<!-- 映射文件 -->

<hibernate-mapping package="com.jege.hibernate.single.table">

    <!-- class表示由hibernate管理的一个持久对象,对应数据库的一个表 ，table表示数据库的表名 -->

    <class name="User" table="t_user">

        <!-- id元素是必须的，对应数据库是表的主键 -->

        <id name="id">

            <!-- generator表示数据库表的主键生成方式,一般都是使用native -->

            <!-- native表示自动选择数据库本地的策略: -->

            <!-- 对于mysql是AUTO_INCREMENT自增 -->

            <!-- 对于oracle是序列 -->

            <generator class="native" />

        </id>

        <!-- 使用property配置非主键属性 -->

        <!-- 可以column配置数据库表的不同于模型User的属性，如下username属性对应表的name字段 -->

        <property name="username" column="name" />

        <property name="password" />

    </class>

</hibernate-mapping>

User.java

package com.jege.hibernate.single.table;

/**

 * @author JE哥

 * @email 1272434821@qq.com

 * @description: 模型对象

 */

public class User {

  private Long id;

  private String username;

  private String password;

  public User() {

  }

  public User(Long id) {

    this.id = id;

  }

  public Long getId() {

    return id;

  }

  public void setId(Long id) {

    this.id = id;

  }

  public String getUsername() {

    return username;

  }

  public void setUsername(String username) {

    this.username = username;

  }

  public String getPassword() {

    return password;

  }

  public void setPassword(String password) {

    this.password = password;

  }

  @Override

  public String toString() {

    return "User [id=" + id + ", username=" + username + ", password=" + password + "]";

  }

}

CrudTest

package com.jege.hibernate.single.table;

import java.util.List;

import org.hibernate.Query;

import org.hibernate.Session;

import org.junit.Before;

import org.junit.Test;

import com.jege.hibernate.util.HibernateUtils;

/**

 * @author JE哥

 * @email 1272434821@qq.com

 * @description: crud测试类

 */

public class CrudTest {

  // 在每个@Test之前自动执行，先保存数据

  @Before

  public void before() throws Exception {

    User user = new User();

    user.setUsername("jege");

    user.setPassword("1272434821");

    Session session = HibernateUtils.INSTANCE.getSession();

    session.beginTransaction();

    session.save(user);

    session.getTransaction().commit();

    session.close();

  }

  @Test

  public void save() throws Exception {

  }

  @Test

  public void update() throws Exception {

    Session session = HibernateUtils.INSTANCE.getSession();

    session.beginTransaction();

    User user = (User) session.get(User.class, 1L);

    user.setUsername("JavaEEGe");

    user.setPassword("1272434821@qq.com");

    session.update(user);

    session.getTransaction().commit();

    session.close();

  }

  @Test

  public void delete() throws Exception {

    Session session = HibernateUtils.INSTANCE.getSession();

    session.beginTransaction();

    User user = (User) session.get(User.class, 1L);

    if (user != null) {

      session.delete(user);

    }

    session.getTransaction().commit();

    session.close();

  }

  @Test

  public void get() throws Exception {

    Session session = HibernateUtils.INSTANCE.getSession();

    User user = (User) session.get(User.class, 1L);

    System.out.println(user);

    session.close();

  }

  @Test

  public void getAll() throws Exception {

    Session session = HibernateUtils.INSTANCE.getSession();

    Query query = session.createQuery("select u from User u");

    List<User> list = query.list();

    for (User user : list) {

      System.out.println(user);

    }

    session.close();

  }

}

源码地址

https://github.com/je-ge/hibernate

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