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mybatis入门(一)创建java工程搭建mybatis环境

时间:2019-06-29 00:36:23      阅读:138      评论:0      收藏:0      [点我收藏+]

标签:color   vat   from   person   manage   类测试   value   action   row   

先创建一个java工程MybatisProject,在src下面建包和实体类,并在数据库创建相同的person表,然后导入mybatis-3.4.6.jar包

package com.liusong.entity;

public class Person {
    private int id;
    private String name;
    private int age;

    public Person() {
        super();
        this.id = id;
        this.name = name;
        this.age = age;
    }

    public Person(int id, String stu_name, int age) {
        super();
        this.id = id;
        this.name = stu_name;
        this.age = age;
    }

    public int getId() {
        return id;
    }

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

    public String getstu_name() {
        return name;
    }

    public void setName(String stu_name) {
        this.name = stu_name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "编号:" + getId() + ", 姓名:" + getstu_name() + ", 年纪" + getAge();
    }

}

 

在实体类下面创建一个XML文件PersonMapper.xml,将官方文档中的配置信息代码作为头信息导入,并将里面的配置改成自己的

技术图片

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--映射文件路径 -->
<mapper namespace="com.liusong.entity.PersonMapper">
  <select id="queryPersonById" resultType="com.liusong.entity.Person">
     select * from person where id = #{id}
  </select>
 </mapper>

 再创建配置信息config.xml,从官方文档导入头信息

技术图片

 

 技术图片

并做修改,导入jdbc的驱动jar包

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE configuration  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"  "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">  
        <!--配置数据库信息 -->   <property name="driver" value="com.mysql.cj.jdbc.Driver" /> <property name="url" value="jdbc:mysql://127.0.0.1:3306/shop?serverTimezone=UTC" /> <property name="username" value="root" /> <property name="password" value="root" /> </dataSource> </environment> </environments>
<!--加载映射文件 --> <mappers> <mapper resource="com/liusong/entity/PersonMapper.xml" /> </mappers> </configuration>

写测试类测试一下

package com.liusong.entity;

import java.io.IOException;
import java.io.Reader;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class TestDemo {
    public static void queryStudentById() throws IOException {
        //将config.xml变为流
        Reader reader = Resources.getResourceAsReader("conf.xml");
        //创建sessionFactory对象,sessionFactory是一个接口,不能new,需要用到SqlSessionFactoryBuilder,并使用其中的build(Reader reader)方法
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
        SqlSession session = sessionFactory.openSession();
        String stament = "com.liusong.entity.PersonMapper.queryPersonById";
        Person person = session.selectOne(stament, 1);
        System.out.println(person);
        session.close();
    }


    public static void main(String[] args) throws IOException {
        queryStudentById();
    }
}

测试结果:编号:1, 姓名:zs, 年纪23

mybatis入门(一)创建java工程搭建mybatis环境

标签:color   vat   from   person   manage   类测试   value   action   row   

原文地址:https://www.cnblogs.com/Lovis/p/11105112.html

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