3.2.2的Model的快取邏輯

public function getField($field,$sepa=null) {
        $options['field']       =   $field;
        $options                =   $this->_parseOptions($options);
        // 判斷查詢快取
        if(isset($options['cache'])){
            $cache  =   $options['cache'];
這裡獲取快取標示符
            $key    =   is_string($cache['key'])?$cache['key']:md5($sepa.serialize($options));
            $data   =   S($key,'',$cache);
            if(false !== $data){
                return $data;
            }
        }        

 if(!empty($resultSet)) {
                $_field         =   explode(',', $field);
                $field          =   array_keys($resultSet[0]);
這裡生成的卻是用的返回的陣列的key
                $key            =   array_shift($field);
                $key2           =   array_shift($field);
                $cols           =   array();
                $count          =   count($_field);
                foreach ($resultSet as $result){
                    $name   =  $result[$key];
                    if(2==$count) {
                        $cols[$name]   =  $result[$key2];
                    }else{
                        $cols[$name]   =  is_string($sepa)?implode($sepa,array_slice($result,1)):$result;
                    }
                }
                if(isset($cache)){
                    S($key,$cols,$cache);