Hibernate4学习一

Posted 2020-09-02

1.导入所有相关jar包

https://pan.baidu.com/s/1i5OakiL

2.配置hibernate.cfg.xml文件

<?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>

        <!-- 数据库连接设置 -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <!-- Student为你的数据库名称 -->
        <property name="connection.url">jdbc:mysql://localhost:3306/QQ_DB</property>
        <property name="connection.username">root</property>
        <property name="connection.password">root</property>

        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>

        <!-- SQL方言 -->
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

        <!-- Enable Hibernate‘s automatic session context management -->
        <property name="current_session_context_class">thread</property>

        <!-- Disable the second-level cache -->
        <property name="cache.provider_class">
            org.hibernate.cache.NoCacheProvider
        </property>

        <!-- 显示SQL语句 -->
        <property name="show_sql">true</property>
        <!-- 格式化输出SQL语句 -->
        <property name="format_sql">true</property>

        <!-- validate 加载hibernate时，验证创建数据库表结构 -->
        <!-- create 每次加载hibernate，重新创建数据库表结构，这就是导致数据库表数据丢失的原因。 -->
        <!-- create-drop 加载hibernate时创建，退出是删除表结构 -->
        <!-- update 加载hibernate自动更新数据库结构 -->
        <property name="hbm2ddl.auto">create</property>
        <property name="myeclipse.connection.profile"></property>


        <!-- 使用annotion注解时，hibernate与数据库对象关系映射表示 -->
        <!-- 推荐使用annotion注解来表示映射关系 -->
        <mapping class="QQUser" />
    </session-factory>

</hibernate-configuration>

3.新建映射类

import java.io.Serializable;
import java.util.Date;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="tb_user")
public class QQUser implements Serializable {

    private String qq_num;
    private String nick_name;
    private String gender;
    private Date birthday;
    private int star_sit;
    
    @Id
    public String getQq_num() {
        return qq_num;
    }
    public void setQq_num(String qq_num) {
        this.qq_num = qq_num;
    }
    public String getNick_name() {
        return nick_name;
    }
    public void setNick_name(String nick_name) {
        this.nick_name = nick_name;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public Date getBirthday() {
        return birthday;
    }
    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }
    public int getStar_sit() {
        return star_sit;
    }
    public void setStar_sit(int star_sit) {
        this.star_sit = star_sit;
    }
    
    
    
}

4.测试

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

public class Test {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

             QQUser u = new QQUser();
             u.setQq_num("7890654");
             u.setNick_name("小明");
             u.setGender("男");
             

            Configuration cfg = new Configuration();
            // 读取hibernate.cfg.xml中的配置
            cfg.configure();
            // 获取SessionFactory
            SessionFactory sf = cfg.buildSessionFactory();
            // 获取Session
            Session session = sf.openSession();
            // 开启事务
            session.beginTransaction();
            // 保存
            session.save(u);
            // 提交事务
            session.getTransaction().commit();
            // 关闭连接
            session.close();
            sf.close();
        
    }

}