Mybatis（二）基于注解的入门实例

package com.lance.mybatis.annocation;

import com.lance.mybatis.bean.User;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

/**
 * @author lance(ZYH)
 * @function
 * @date 2018-07-07 22:13
 */
public interface UserMapper {

    //根据 id 查询 user 表数据
    @Select("select * from user where id = #{id}")
    public User selectUserById(int id) throws Exception;

    //向 user 表插入一条数据
    @Insert("insert into user(username,password,sex,birthday,address) value(#{username},#{password},#{sex},#{birthday},#{address})")
    public void insertUser(User user) throws Exception;

    //根据 id 修改 user 表数据
    @Update("update user set username=#{username},sex=#{sex} where id=#{id}")
    public void updateUserById(User user) throws Exception;

    //根据 id 删除 user 表数据
    @Delete("delete from user where id=#{id}")
    public void deleteUserById(int id) throws Exception;
}

package com.lance.mybatis.test;

import com.lance.mybatis.annocation.UserMapper;
import com.lance.mybatis.bean.User;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Before;
import org.junit.Test;

import java.io.InputStream;

/**
 * @author lance(ZYH)
 * @function
 * @date 2018-07-07 22:21
 */
public class UserAnnocationTest {
    //定义 SqlSession
    SqlSession session =null;

    @Before
    public void init(){
        //定义mybatis全局配置文件
        String resource = "com/lance/mybatis/config/mybatis-configuration.xml";
        //加载 mybatis 全局配置文件
        InputStream inputStream = UserAnnocationTest.class.getClassLoader()
                .getResourceAsStream(resource);
        //构建sqlSession的工厂
        SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        //根据 sqlSessionFactory 产生 session
        session = sessionFactory.openSession();
    }

    //注解的增删改查方法测试
    @Test
    public void testAnncationCRUD() throws Exception{
        //根据session获取 UserMapper接口
        UserMapper userMapper = session.getMapper(UserMapper.class);

        //调用selectUserById()方法
        User user = userMapper.selectUserById(1);
        System.out.println(user);

        //调用  insertUser() 方法
        User user1 = new User();
        user1.setUsername("江西老表");
        user1.setSex("不详");
        userMapper.insertUser(user1);

        //调用 updateUserById() 方法
        User user2 = new User();
        user2.setId(2);
        user2.setUsername("杉菜");
        userMapper.updateUserById(user2);

        //调用 eleteUserById() 方法
        userMapper.deleteUserById(6);

        session.commit();
        session.close();
    }
}