mybatis 如何利用resultMap复杂类型list映射
作者：954L
这篇文章主要介绍了mybatis 如何利用resultMap复杂类型list映射的操作，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教
mybatis resultMap复杂类型list映射
映射泛型为对象
xml
<resultMap id="internetDataDTO" type="com.mdm.skr.mdm_common.dto.StrategyInternetDataDTO">
<id property="id" column="id" jdbcType="INTEGER"/>
<result property="internetData" column="internet_data" jdbcType="INTEGER"/>
<collection property="userList" ofType="com.mdm.skr.mdm_common.entity.SysUser">
<id property="id" column="id" jdbcType="INTEGER"/>
<result property="number" column="number" jdbcType="VARCHAR"/>
<result property="pushToken" column="push_token" jdbcType="VARCHAR"/>
<result property="wsChannelId" column="ws_channel_id" jdbcType="VARCHAR"/>
</collection>
</resultMap>
<select id="selectInternetDataDTOByInternetDataIdList" resultMap="internetDataDTO">
SELECT sidu.id, sidu.internet_data, su.id, su.number, su.push_token, su.ws_channel_id
FROM strategy_internet_data_user sidu JOIN skr_user su on su.id = sidu.user_id
WHERE sidu.id IN
<foreach collection="internetDataIdList" open="(" close=")"
separator="," item="internetDataId">
#{internetDataId}
</foreach>
</select>
DTO
@Data
public class StrategyInternetDataDTO {
private Integer id ;
private Integer internetData ;
private List<SysUser> userList ;
}
ENTITY
@Data
public class SysUser {
private Integer id;
private String number;
private String pushToken;
private String wsChannelId ;
}
MAPPER
List<StrategyInternetDataDTO> selectInternetDataDTOByInternetDataIdList(@Param("internetDataIdList") List<Integer> internetDataIdList);
映射泛型为包装类型
xml
<resultMap id="internetDataDTO" type="com.mdm.skr.mdm_common.dto.StrategyInternetDataDTO">
<id property="id" column="id" jdbcType="INTEGER"/>
<result property="internetData" column="internet_data" jdbcType="INTEGER"/>
<collection property="userIdList" ofType="java.lang.Integer" javaType="java.util.List">
<result column="userId"/>
</collection>
</resultMap>
<select id="selectInternetDataDTOByInternetDataIdList" resultMap="internetDataDTO">
SELECT sidu.id, sidu.internet_data, sidu.user_id userId
FROM strategy_internet_data_user sidu
WHERE sidu.id IN
<foreach collection="internetDataIdList" open="(" close=")"
separator="," item="internetDataId">
#{internetDataId}
</foreach>
</select>
DTO
@Data
public class StrategyInternetDataDTO {
private Integer id ;
private Integer internetData ;
private List<Integer> userIdList ;
}
MAPPER
List<StrategyInternetDataDTO> selectInternetDataDTOByInternetDataIdList(@Param("internetDataIdList") List<Integer> internetDataIdList);
mybatis的几种传值方式
1.单个参数传参
User selectUserInfo(Integer userId);
<select id = "selectUserInfo" parameterType = "java.lang.Inte" resultMap="BaseResultMap" >
select
<include refid="Base_Column_List" />
from user
where userId = #{userId , jdbcType=INTEGER}
</select>
2. 按照顺序传参
User selectUserInfo(Integer userId, String userName, String userPass);
<select id = "selectUserInfo" resultMap="BaseResultMap" >
select
<include refid="Base_Column_List" />
from user
where userId = #{arg0} and userName = #{arg1} and userPass = #{arg2}
</select>
3. 使用@Param注解传参
User selectUserInfo(@Param("userName")String userName, @Param("userPass")String userPass);
<select id = "selectUserInfo" resultMap="BaseResultMap" >
select
<include refid="Base_Column_List" />
from user
where userName = #{userName} and userPass = #{userPass}
</select>
4. 使用Map传参 注意传参方式：parameterType="java.util.Map"
Map<String,Object> map = new HashMap();
map.put("userName","张三");
map.put("userPass","123");
User user = userMapper.selectUserInfo(map);
User selectUserInfo(Map<String,Object> map);
<select id="selectUserInfo" parameterType="java.util.Map" resultMap="BaseResultMap" >
select
<include refid="Base_Column_List" />
from user
where userName = #{userName} and userPass = #{userPass}
</select>
5. 实体对象传参
User user = new User();
user.setUserName("张三");
user.setUserPass("123");
User user = UserMapper.selectUserInfo(user);
User selectUserInfo(User record);
<select id="selectUserInfo" parameterType="com.LiuXu.bean.User" resultMap="BaseResultMap" >
select
<include refid="Base_Column_List" />
from user
where userName = #{userName} and userPass = #{userPass}
</select>
6. List传参
List<User> list = new ArrayList<>();
list.add(user1);
list.add(user2);
List<User> userList = userMapper.selectUserInfo(list);
List<User> selectUserInfo(List<User> record);
<select id="selectUserInfo" resultMap="BaseResultMap" >
select
<include refid="Base_Column_List" />
from user
where userId in
<foreach item="item" index="index" collection="list" open="(" separator="," close=")">
#{item}
</foreach>
</select>
以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。