mybatis中基于注解建立数据库表和实体类的对应关系(maven工程)

mybatis中基本的基于注解的CRUD操作请看https://blog.csdn.net/gaohanjie123/article/details/106414923

建立数据库表和实体类的对应关系就相当于是解决Mapper.xml中resultMap的问题

基于注解的解决方案：使用@Results注解

package com.itheima.mapper;

import com.itheima.domain.User;
import org.apache.ibatis.annotations.*;
import org.apache.ibatis.mapping.FetchType;
import java.util.List;

/**
 * @author 黑马程序员
 * @Company http://www.ithiema.com
 * 在mybatis中针对,CRUD一共有四个注解
 *  @Select @Insert @Update @Delete
 */

public interface UserMapper {

    /**
     * 查询所有用户
     * @return
     */
    @Select("select * from user")
    @Results(id="userMap",value={
            @Result(id=true,column = "id",property = "userId"),
            @Result(column = "username",property = "userName"),
            @Result(column = "address",property = "userAddress"),
            @Result(column = "sex",property = "userSex"),
            @Result(column = "birthday",property = "userBirthday"),           
    })
    List findAll();

    /**
     * 根据id查询用户
     * @param userId
     * @return
     */
    @Select("select * from user  where id=#{id} ")
    @ResultMap("userMap")
    User findById(Integer userId);

    /**
     * 根据用户名称模糊查询
     * @param username
     * @return
     */
    @Select("select * from user where username like #{username} ")
    @ResultMap("userMap")
    List findUserByName(String username);


}