gistfile1.php

 public function select($options=array()) {
        $pk   =  $this->getPk();
        if(is_string($options) || is_numeric($options)) {
            // 根据主键查询
            if(strpos($options,',')) {
                $where[$pk]     =  array('IN',$options);
            }else{
                $where[$pk]     =  $options;
            }
            $options            =  array();
            $options['where']   =  $where;
        }elseif (is_array($options) && (count($options) > 0) && is_array($pk)) {
            // 根据复合主键查询
            $count = 0;
            foreach (array_keys($options) as $key) {
                if (is_int($key)) $count++; 
            } 
            if ($count == count($pk)) {
                $i = 0;
                foreach ($pk as $field) {
                    $where[$field] = $options[$i];
                    unset($options[$i++]);
                }
                $options['where']  =  $where;
            } else {
                return false;
            }
        } elseif(false === $options){ // 用于子查询 不查询只返回SQL
        	$options['fetch_sql'] = true;
        }
        // 分析表达式
        $options    =  $this->_parseOptions($options);
        // 判断查询缓存
        if(isset($options['cache'])){
            $cache  =   $options['cache'];
            $key    =   is_string($cache['key'])?$cache['key']:md5(serialize($options));
            $data   =   S($key,'',$cache);
            if(false !== $data){
                return $data;
            }
        }        
        $resultSet  = $this->db->select($options);
        if(false === $resultSet) {
            return false;
        }
        if(!empty($resultSet)) { // 有查询结果
            if(is_string($resultSet)){
                return $resultSet;
            }

            $resultSet  =   array_map(array($this,'_read_data'),$resultSet);
            $this->_after_select($resultSet,$options);
            if(isset($options['index'])){ // 对数据集进行索引
                $index  =   explode(',',$options['index']);
                foreach ($resultSet as $result){
                    $_key   =  $result[$index[0]];
                    if(isset($index[1]) && isset($result[$index[1]])){
                        $cols[$_key] =  $result[$index[1]];
                    }else{
                        $cols[$_key] =  $result;
                    }
                }
                $resultSet  =   $cols;
            }
        }

        if(isset($cache)){
            S($key,$resultSet,$cache);
        }
        return $resultSet;
    }