MyBatis foreach 批量更新实例

@Override
 public BaseVO deleteOptionDetail(Integer id) {
 
  // 合法性验证
  if (null == id) {
   return ParamErrorVO.getInstance();
  }
  ConfigOptionDetail configOptionDetail = configOptionDetailMapper.selectById(id);
  if (null == configOptionDetail || 1 == configOptionDetail.getIsDeleted()) {
   return new ErrorVO("该配置不存在");
  }
  if (configOptionDetail.getSystem() == 1) {
   return new ErrorVO("系统属性不能删除");
  }
  if (configOptionDetail.getUseCount() = 0) {
   return new ErrorVO("配置正在使用不能删除，请先删除使用配置的地方");
  }
 
  // 合法性通过
  configOptionDetail.setIsDeleted(1);
  configOptionDetail.setGmtModefied(Calendar.getInstance().getTime());
  configOptionDetailMapper.updateById(configOptionDetail);
 
  // 更新内存配置
  ConfigOptionConstruct.updateOption();
  return SuccessVO.getInstance();
 }

@Override
 public BaseVO deleteRoomByIds(Integer[] ids) {
  if (null == ids) {
   return ParamErrorVO.getInstance();
  }
  EntityWrapper<Room> entityWrapper = new EntityWrapper<>();
  entityWrapper.where("isdelete={0}", 0);
  // 核查删除的房间中是否存在正在使用的设备
  List<Integer> notDelete = deviceInfoService.checkRoomIds(ids);
  if (null != notDelete && 0 != notDelete.size()) {
   // 存在仍在使用设备的房间
   entityWrapper.in("id", notDelete);
   // 查询这些房间
   List<Room> roomList = roomMapper.selectList(entityWrapper);
   // 获取房间的名称
   StringBuilder stringBuilder = new StringBuilder(roomList.stream().map(Room::getName).collect(Collectors.toList()).toString());
   System.out.println(stringBuilder);
   // TODO: 2018/4/8 可能需要修改提示语
   return new ErrorVO(stringBuilder + " 房间存在未删除的设备，请先删除设备");
  }
 
  // 房间没有设备在使用
  List<Integer> idList = new ArrayList<>();
  idList.addAll(Arrays.asList(ids));
  // 查询需要删除的房间
  entityWrapper.in("id", idList);
  List<Room> roomList = roomMapper.selectList(entityWrapper);
  if (null == roomList || idList.size() != roomList.size()) {
   return new ErrorVO("存在错误的房间");
  }
  // ******************************************************************************************** 重点
  // 可以逻辑删除
  int count = roomMapper.logicDeleteByIds(idList);
  List<Long> optionIds = roomList.stream().map(room -> Long.parseLong(room.getRoomPosition())).collect(Collectors.toList());
  Map<Long, Long> optionIdsMap = optionIds.stream().collect(Collectors.groupingBy(p -> p,Collectors.counting()));
  // 移除所属楼层配置选项的使用
  configOptionDetailService.removeUseCount(optionIdsMap);
  ConfigOptionConstruct.updateOption();
  if (count == idList.size()) {
   return SuccessVO.getInstance();
  } else {
   return new ErrorVO("部分删除失败");
  } 
 }

<select id="selectPostIn" resultType="domain.blog.Post">
 SELECT *
 FROM POST P
 WHERE ID in
 <foreach item="item" index="index" collection="list"
  open="(" separator="," close=")">
  #{item}
 </foreach>
</select>

<update id="addUseCountByIds">
 update config_option_detail
 set gmt_modified = #{gmtModified}, use_count = use_count +
 <foreach item="item" index="index" collection="list" open=" case id " separator=" " close=" end">
 when #{index} then #{item}
 </foreach>
 where id in
 <foreach item="item" index="index" collection="list"
  open="(" separator="," close=")">
 #{index}
 </foreach>
</update>

int updateReadCount(@Param(value = "topicIdList") List<Long> topicIdList);

<update id="updateReadCount" parameterType="java.util.List">
  update CTS
  set read_count = read_count + 1
  where topic_id in
  <foreach item="item" index="index" collection="topicIdList" open="(" close=")" separator=",">
   #{item.topicId}
  </foreach>
 </update>

<update id="updateReadCount" parameterType="java.util.List">
  update CTS
  set read_count = read_count + 1
  where topic_id in
  <foreach item="topicId" index="index" collection="topicIdList" open="(" close=")" separator=",">
   #{topicId}
  </foreach>
 </update>