protected $table = 'user_city';public $timestamps = false;//添加 返回idpublic function cityadd($data){    return $this->insertGetId($data);}//單條查找public function getfind($id){    if($this->where('id',$id)->first()){      return $this->where('id',$id)->first()->toArray();    }else{      return [];    }}//查詢用戶有幾個uid,返回數量public function countCity($uid){    if($this->where('uid',$uid)->first()){      return $this->where('uid',$uid)->count();    }else{      return [];    }}//查詢全部數據public function getAll(){    return $this->get()->toArray();}/*** 修改管理員信息* @param $id* @param $data* @return bool*/public function upAdmin($id,$data){    if($this->find($id)){      return $this->where('id',$id)->update($data);    }else{      return false;    }}//加條件，時間//查詢用戶的認購的城數public function buy_num($uid){    $startDate = date('Y-m-01', strtotime(date("Y-m-d")));    $endDate = date('Y-m-d', strtotime("$startDate +1 month -1 day"));    // 將日期轉換為Unix時間戳    $endDate=$endDate." 22:59:59";    $startDateStr = strtotime($startDate);    $endtDateStr = strtotime($endDate);    return $this->where('uid',$uid)->where('buy_type',1)->whereBetween('create_time', array($startDateStr,$endtDateStr))->sum('buy_num');}/*** 根據id查找城池信息 只返回某個字段的值* @param $id* @return array*/public function getCityName($id){    if($this->where('city_id',$id)->first()){      return $this->where('city_id',$id)->lists('city_name')[0];    }else{      return [];    }}