Mybatis源码解析系列：入门Demo搭建

1.1. Mybatis基础知识

1.2. 入门Demo搭建

1.2.1. 搭建Java工程

1.2.1.1.1. 创建Maven工程

1.2.1.1.2. 添加依赖

1.2.2. 编写代码

1.2.2.1.1. 编写主类

public static void main(String[] args) throws Exception {
  Reader reader = Resources.getResourceAsReader("org/apache/ibatis/submitted/basetest/mybatis-config.xml"); // 加载配置文件
  SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader); //创建sqlSessionFactory对象
  SqlSession sqlSession = sqlSessionFactory.openSession(); // 获取sqlSession对象
  Mapper mapper = sqlSession.getMapper(Mapper.class); // 获取映射接口
  User user = mapper.getUser(1); // 调用接口方法
  System.out.println(user); //
}

 

1.2.2.1.2. 编写实体对象

public class User {

  private Integer id;
  private String name;

1.2.2.1.3. 编写映射接口

public interface Mapper {
  /**
   *  根据用户主键ID获取用户独享
   * @param id 主键ID
   * @return
   */
  User getUser(Integer id);
  /**
   * 保存用户对象
   * @param user 用户对象
   * @return
   */
  void insertUser(User user);
}

1.2.2.1.4. 编写映射文件

<!DOCTYPE mapper
    PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="org.apache.ibatis.submitted.basetest.Mapper">

    <select id="getUser" resultType="org.apache.ibatis.submitted.basetest.User">
        select * from users where id = #{id}
    </select>

    <insert id="insertUser">
        insert into users values(#{id}, #{name})
    </insert>

</mapper>

1.2.2.1.5. 编写配置文件

<configuration>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC">
                <property name="" value="" />
            </transactionManager>
            <dataSource type="UNPOOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver" />
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?serverTimezone=GMT%2B8" />
                <property name="username" value="root" />
                <property name="password" value="123456" />
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper class="org.apache.ibatis.submitted.basetest.Mapper" />
    </mappers>

</configuration>

1.2.2.1.6. 创建数据库表

CREATE TABLE `users` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(20) COLLATE utf8_bin DEFAULT NULL,
PRIMARY KEY (`id`)
);

 

1.2.3. 运行程序

 

 

 

1.3. 创建SqlSessionFactory序列图