마이바티스 시작하기 가이드: 처음부터 프로그램 작성하기

<?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">
                 <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                 <property name="url" value="jdbc:mysql://localhost:3306/mybatis_demo?serverTimezone=UTC"/>
                 <property name="username" value="your_username"/>
                 <property name="password" value="your_password"/>
             </dataSource>
         </environment>
    </environments>
    <mappers>
         <!-- 在此处添加映射文件 -->
    </mappers>
</configuration>

public class MyUser {
    private int id;
    private String name;
    private int age;
 
    // 省略构造方法、getter和setter
}

<?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">
<mapper namespace="com.example.mapper.MyUserMapper">
    <resultMap id="MyUserMap" type="com.example.entity.MyUser">
        <id property="id" column="id"/>
        <result property="name" column="name"/>
        <result property="age" column="age"/>
    </resultMap>
 
    <select id="getUserById" resultMap="MyUserMap">
        SELECT * FROM user WHERE id=#{id}
    </select>
 
    <insert id="addUser" parameterType="com.example.entity.MyUser">
        INSERT INTO user(name, age) VALUES (#{name}, #{age})
    </insert>
</mapper>

public interface MyUserMapper {
    MyUser getUserById(int id);
 
    int addUser(MyUser user);
}

public class Main {
    public static void main(String[] args) {
        // 创建SqlSessionFactory对象
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(Resources.getResourceAsStream("mybatis-config.xml"));
 
        // 创建SqlSession对象
        try(SqlSession session = factory.openSession()) {
            // 创建Mapper对象
            MyUserMapper mapper = session.getMapper(MyUserMapper.class);
 
            // 调用方法进行数据库操作
            MyUser user = mapper.getUserById(1);
            System.out.println(user.getName());
 
            MyUser newUser = new MyUser();
            newUser.setName("NewUser");
            newUser.setAge(20);
            mapper.addUser(newUser);
 
            session.commit();
        }
    }
}