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Thinkphp使用mongodb数据库实现多条件查询方法_PHP

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Release: 2016-06-01 11:51:25
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MongoDBThinkPHP

有个项目用了mongodb数据库,查询条件有and也有or,按Thinkphp官方手册,使用复合查询(_complex),getLastSql输出查询语句,发现查询条件是空的.用字符串模式查询(_string),请求字符串查询(_query)无法满足需求.估计用mongodb的用户不多,thinkphp官方对这方面支持也不够.打开thinkphp的mongodb驱动,Thinkphp/Extend/Driver/Db/DbMongo.class.php,找到protected function parseThinkWhere($key,$val)方法,可以发现,switch里没有_complex,也就是说,Thinkphp使用mongodb时,根本不支持复合查询.加上:

复制代码 代码如下:
case '_complex'://复合查询
             $arr   = array();
             foreach ($val as $nkey=>$nval){
              if( strpos($nkey,'_')!=0)
              {
               $parseArr=$this->parseWhereItem($nkey,$nval);
               //转换成对象
               $obj=new stdClass();
               foreach ($parseArr as $pkey=>$pval)
               {
                $obj->$pkey=$pval;
               }
               array_push($arr, $obj);
              }
             }
             if(isset($val['_logic']) && strtolower($val['_logic']) == 'or' ) {
              unset($val['_logic']);
              $query['$or']   =  $arr;
             }
             break;

这里之所以要转换成对象,是因为使用thinkphp使用json_encode函数生成查询语句,但是如果数组元素带key,json_encode函数会把数组转换成对象的形式,mongodb不能识别.因为目前只用到or,所以,代码只对or作了处理.
另外,发现个BUG(不知道算不算),在parseWhere方法中:
复制代码 代码如下:
foreach ($where as $key=>$val){
            if('_id' != $key && 0===strpos($key,'_')) {
                // 解析特殊条件表达式
                //原 $query=$this->parseThinkWhere($key,$val);
                $query   = array_merge($query,$this->parseThinkWhere($key,$val));
            }else{
                // 查询字段的安全过滤
                if(!preg_match('/^[A-Z_\|\&\-.a-z0-9]+$/',trim($key))){
                    throw_exception(L('_ERROR_QUERY_').':'.$key);
                }
                $key = trim($key);
                if(strpos($key,'|')) {
                    $array   =  explode('|',$key);
                    $str   = array();
                    foreach ($array as $k){
                        $str[]   = $this->parseWhereItem($k,$val);
                    }
                    $query['$or'] =    $str;
                }elseif(strpos($key,'&')){
                    $array   =  explode('&',$key);
                    $str   = array();
                    foreach ($array as $k){
                        $str[]   = $this->parseWhereItem($k,$val);
                    }
                    $query   = array_merge($query,$str);
                }else{
                    $str   = $this->parseWhereItem($key,$val);
                    $query   = array_merge($query,$str);
                }
            }
        }

解析特殊条件表达式时,源代码里是$query=$this->parseThinkWhere($key,$val);当特殊表达式在where数组里不是第一个元素时,就出错了,else里的代码得到的$query数组,都没了.

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