、创建实体类
public class User {
private int id; //id
private String name; //姓名
private String pwd; //密码
//构造,有参,无参
//set/get
//toString()
}
6、编写Mapper接口类
import com.kuang.pojo.User;
import java.util.List;
public interface UserMapper {
List<User> selectUser();
}
7、编写Mapper.xml配置文件
-
namespace 十分重要，不能写错！
<?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.kuang.dao.UserMapper">
<select id="selectUser" resultType="com.kuang.pojo.User">
select * from user
</select>
</mapper>
8、编写测试类
-
Junit 包测试
public class MyTest {
@Test
public void selectUser() {
SqlSession session = MybatisUtils.getSession();
//方法一:
//List<User> users = session.selectList("com.kuang.mapper.UserMapper.selectUser");
//方法二:
UserMapper mapper = session.getMapper(UserMapper.class);
List<User> users = mapper.selectUser();
for (User user: users){
System.out.println(user);
}
session.close();
}
}