Hibernate 初识

 

第一步:

  导包:(这是我根据其他网站的介绍导入的包,可能不完善,但开发没什么问题,遇到问题再说)

  

  当然还有mysql的jar包

  

第二步:进行hibernate环境配置

在classpath目录下建立hibernate.cfg.xml配置文件,名字最好不要修改:

内容:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>

    <session-factory>
        <!-- Database connection settings -->
      <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
      <property name="connection.url">jdbc:mysql://localhost:3306/student?serverTimezone=UTC</property>
      <property name="connection.username">root</property>
      <property name="connection.password">123456</property>

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

      <!-- SQL dialect 方言 MySQLDialect不同数据库不一样-->
      <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.internal.NoCacheProvider</property>

      <!-- Echo all executed SQL to stdout  生产的sql打印出来-->
      <property name="show_sql">true</property>

<mapping resource="com/xxc/model/Student.hbm.xml"></mapping><!--后面的映射配置文件--> </session-factory> </hibernate-configuration>

 

第三步,创建数据库

 

如果对数据库创建有问题的自行百度。

第四步:

 建立实体类:Student.java

package com.xxc.model;

public class Student {
    private int id;
    private String name;
    private int age;
    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;
    }
}

实体类映射配置文件:Student.hbm.xml,(这名字以实体类的名字为开头,以hbm.xml结尾)

<?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="com.xxc.model.Student" table="student"><!-- 表名 -->
        <id name="id"></id><!-- column对应数据库表里面的字段 -->
        <property name="name" ></property>
        <property name="age" ></property>
    </class>
    
</hibernate-mapping>

 

第五步,建立执行程序:Test1.java

package hibernateTest;

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

import com.xxc.model.Student;

public class Test1 {

    public static void main(String[] args) {
        Student s = new Student();
        s.setId(5);
        s.setName("xxkjlc");
        s.setAge(45);
        
        Configuration cfg = new Configuration();
        SessionFactory sf = cfg.configure().buildSessionFactory();
        Session session = sf.openSession();
        //开始事务    
        session.beginTransaction();
        session.save(s);
        //结束事务
        session.getTransaction().commit();
        session.close();
        sf.close();
    }
}

结果:

在控制台中会输出:

数据库中也会存入数据:

 

posted on 2018-10-07 21:03  xxcxxc  阅读(165)  评论(0编辑  收藏  举报