MyBatis-Plus

@GetMapping("/selectDeptinfoByCode")
  public Result selectDeptinfoByCode(@RequestParam("deptCode") String fdDeptCode) {
      LambdaQueryWrapper<Deptinfo> queryWrapper = new QueryWrapper<Deptinfo>().lambda();
      queryWrapper.eq(Deptinfo::getDeptCode, fdDeptCode);
      Deptinfo deptinfo = deptinfoService.getOne(queryWrapper);
      if (Optional.ofNullable(deptinfo).isPresent()) {
          return Result.success(deptinfo);
      }
      Result result = Result.fail();
      result.setMessage("查询失败!");
  return result;

}

@Override
public void removeStateIconByID(Integer associateId) {
    LambdaQueryWrapper<MapIcon> wrapper = new LambdaQueryWrapper<>();
    wrapper.eq(MapIcon::getAssociateId, associateId).and(w -> w.eq(MapIcon::getType, "state"));
    mapIconMapper.delete(wrapper);
}