多查询+单查询

Question

如何设置此功能的工作？最后一个查询没有得到执行..我已经在循环中搜索了很多查询（foreach，for，while），但没有任何..我试图存储会话。

private function gc($expire) 
{ 
    $gcq = "SELECT `path`, `last`, LENGTH(`path`) FROM `sessions` WHERE LENGTH(`path`) > 0 AND DATE_ADD(`last`, INTERVAL ".(int) $expire." SECOND) < NOW();"; 
    $gcq .= "DELETE FROM `sessions` WHERE DATE_ADD(`last`, INTERVAL ".(int) $expire." SECOND) < NOW()"; 
      if($this->dbh->multi_query($gcq)) 
       { 
       $arr_gc = null; 
       $count = 0; 
       do { 
         if($result = $this->dbh->store_result()) 
         { 
         while($row = $result->fetch_assoc()) 
         { 
         $arr_gc[$count] = array($row['path'], $row['last']); 
         $count++; 
         } 
         $result->free(); 
         } 
         if($this->dbh->more_results()) 
         { 
         $garbage = null; 
         } 
        } 
        while($this->dbh->next_result()); 
        } 
        // no problems up here.. 
        // problems from here to end....   

        $alfa = count($arr_gc); 

        if($alfa > 0) 
        { 
         $count = 0; 

         while($count < $alfa) 
         { 
         $this->dbh->query("INSERT INTO `store_sess` SET `xpath` = '".$this->dbh->real_escape_string($arr_gc[$count][0])."', in = '".$this->dbh->real_escape_string($arr_gc[$count][1])."', out = '0000-00-00 00:00:00'"); 
         $count++; 
         }       
        } 
    return $this->dbh->affected_rows; 
} 

编辑： store_sess表的结构：

id int (autoincrement) 
xpath longtext 
in datetime (tried also with varchar) 
out varchar 

Answer 1

while($count < $alfa) { 
    $this->dbh->query("INSERT INTO `store_sess` SET `xpath` = '".$this->dbh->real_escape_string($arr_gc[$count][0])."', in = '".$this->dbh->real_escape_string($arr_gc[$count][1])."', out = '0000-00-00 00:00:00'"); 
    $count++; 
} 

上面的代码是不是很可扩展性。相反，您应该完整地设置您的查询（您可以使用一个查询执行多个插入操作），并在查询字符串设置完成后执行它。

UPDATE

你while循环是不必要也。

结束时更新

$insertVals = ""; 
for($count = 0; $count < $alfa, $count++) { 
    $insertVals = ($insertVals == "" ? "" : ", ") . 
     "('" . $this->dbh->real_escape_string($arr_gc[$count][0]) . "', '" . 
     $this->dbh->real_escape_string($arr_gc[$count][1]) . 
     "', '0000-00-00 00:00:00')"; 
} 

$query = "INSERT INTO `store_sess` (`xpath`, `in`, `out`) VALUES " . $insertVals;