Hibernate的入门之配置文件和增删改查

首先使用maven导入jar包,然后配置主xml文件

<?xml version="1.0" encoding="UTF-8"?>
<!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>
      <!-- 1. 数据库相关信息 -->
      <property name="connection.username">root</property>
      <property name="connection.password">root</property>
      <!--数据库链接地址-->
      <property name="connection.url">jdbc:mysql://localhost:3306/hibernate?useUnicode=true&amp;characterEncoding=UTF-8</property>
      <!--数据库驱动类-->
      <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
      <!--设置数据库方言-->
      <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
      <!-- 配置本地事务（No CurrentSessionContext configured!） -->
      <property name="hibernate.current_session_context_class">thread</property>
      <!-- 2. 调试相关 -->
      <!--是否显示数据库语句在项目部署后要设置为fals提高 项目运行效率-->
      <property name="show_sql">true</property>
      <!--格式化sql语句-->
      <property name="format_sql">true</property>
      <!-- 3. 添加实体映射文件 -->
      <mapping resource="User.hbm.xml"/>
   </session-factory>
</hibernate-configuration>

然后配置实体类的xml文件,一个实体类对应一个文件

实体类:

package com.hw.one;

import java.io.Serializable;

public class User implements Serializable {

    private static final long serialVersionUID = -3363120264501521428L;

    private Integer id;
    private String userName;
    private String userPwd;

    private String realName;
    private String sex;
    private java.sql.Date birthday;

    private java.sql.Timestamp createDatetime;
    private String remark;

    public User() {
        super();
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getUserPwd() {
        return userPwd;
    }

    public void setUserPwd(String userPwd) {
        this.userPwd = userPwd;
    }

    public String getRealName() {
        return realName;
    }

    public void setRealName(String realName) {
        this.realName = realName;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public java.sql.Date getBirthday() {
        return birthday;
    }

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

    public java.sql.Timestamp getCreateDatetime() {
        return createDatetime;
    }

    public void setCreateDatetime(java.sql.Timestamp createDatetime) {
        this.createDatetime = createDatetime;
    }

    public String getRemark() {
        return remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }

    @Override
    public String toString() {
        return "User [id=" + id + ", userName=" + userName + ", userPwd=" + userPwd + ", realName=" + realName
                + ", sex=" + sex + ", birthday=" + birthday + ", createDatetime=" + createDatetime + ", remark="
                + remark + "]";
    }

}

实体类的配置文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
   <!--name为全限定名,table为表名  id为主键字段-->
   <class name="com.hw.one.User" table="t_hibernate_user">
      <id name="id" type="java.lang.Integer" column="id">
         <generator class="increment" />
      </id>
      <!--name为实体类属性名,type为属性类型的全限定名  column为对应数据库的字段名-->
      <property name="userName" type="java.lang.String"
         column="user_name">
      </property>
      <property name="userPwd" type="java.lang.String"
         column="user_pwd">
      </property>
      <property name="realName" type="java.lang.String"
         column="real_name">
      </property>
      <property name="sex" type="java.lang.String" column="sex">
      </property>
      <property name="birthday" type="java.sql.Date"
         column="birthday">
      </property>
      <property insert="false" update="false" name="createDatetime" type="java.sql.Timestamp"
         column="create_datetime">
      </property>
      <property name="remark" type="java.lang.String"
         column="remark">
      </property>
   </class>
</hibernate-mapping>

使用测试类连接数据库对数据增删改查代码

package com.hw.one;


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

import java.sql.Date;
import java.util.List;

/**
 * hibernate测试
 */
public class test {


    public static void main(String[] args) {
        /**
         * 1.对hibernate.config.xml建模
         * 2.通过建模获得的config文件类，获取所配置的sessionfactory
         * 3.获取session会话
         * 4.开启事务
         * 5。操作数据库
         * 6.提交事务
         * 7.关闭session会话
         */
        Configuration configure = new Configuration().configure("hibernate.cfg.xml");
        SessionFactory sessionFactory = configure.buildSessionFactory();
        Session session = sessionFactory.openSession();
        Transaction transaction = session.beginTransaction();
        //添加
//        User user = new User();
//        user.setBirthday(new Date(new java.util.Date().getTime()));
//        user.setRealName("123");
//        user.setRemark("123");
//        user.setSex("男");
//        user.setUserName("123");
//        user.setUserPwd("213");
//        session.save(user);

        //删除
//        User user=new User();
//        user.setId(3);
//        session.delete(user);

//        查询
//        User user=session.get(User.class,2);
//        System.out.println(user.toString());
//        List<User> users=session.createQuery("from User").list();
//        for (User user : users) {
//            System.out.println(user.toString());
//        }

//        修改
//        User user=session.get(User.class,2);
//        user.setUserName("www");
//        System.out.println(user.toString());


        transaction.commit();
        session.close();

    }

}