MyBatisPlus之lambdaChainWrapper

/**
     * 通过老科室主键查询对照
     *
     * @return
     */
    public DepartmentMapping getDepartmentMappingByOldId(Long oldId) {
        DepartmentMappingPo po = new LambdaQueryChainWrapper<>(this.departmentMappingMapper)
                .eq(DepartmentMappingPo::getOldId, oldId)
                .last(" LIMIT 1 ")
                .one();
        return DepartmentMappingConverter.ME.po2bo(po);
    }