0
所以我一直在研究IRC遊戲一年,現在用PHP編寫,並使用PHP到IRC框架。MySQL查詢優化
最近,我添加了歸檔分數的功能(它們每隔幾百次就會被重新設置),這迫使我更新各種管理功能。
我剛剛更新了一個函數,允許我合併兩個玩家(一些用戶不打擾他們的舊密碼等等),以便合併歸檔分數(如果在我找到之前發生了重置重複賬戶)。
比分,融合部(下圖)的作品已經打算,但我不知道是否是因爲我覺得很沉重,我可以優化工藝(但想不出更好的東西):
$from_stats = $this->db->query("SELECT `games`, `wins`, `points`, `date_archive` FROM ".$this->dbprefix."score WHERE `id`=".$id1." AND `channel`='".$gamechan."' GROUP BY `date_archive`"); // get scores for the original account
$to_stats = $this->db->query("SELECT `games`, `wins`, `points`, `date_archive` FROM ".$this->dbprefix."score WHERE `id`=".$id2." AND `channel`='".$gamechan."' GROUP BY `date_archive`"); // get scores for the duplicated account
$from_games = array();
$from_wins = array();
$from_points = array();
$from_date = array();
while (list($fromstats_games,$fromstats_wins,$fromstats_points,$fromstats_date) = $this->db->fetchRow($from_stats)) { // build score arrays for the original account
$from_games[count($from_games)] = $fromstats_games;
$from_wins[count($from_wins)] = $fromstats_wins;
$from_points[count($from_points)] = $fromstats_points;
$from_date[count($from_date)] = $fromstats_date;
}
$to_games = array();
$to_wins = array();
$to_points = array();
$to_date = array();
while (list($tostats_games,$tostats_wins,$tostats_points,$tostats_date) = $this->db->fetchRow($to_stats)) { // build score arrays for the duplicated account
$to_games[count($to_games)] = $tostats_games;
$to_wins[count($to_wins)] = $tostats_wins;
$to_points[count($to_points)] = $tostats_points;
$to_date[count($to_date)] = $tostats_date;
}
foreach ($from_date as $key1 => $id1_date) {
foreach ($to_date as $key2 => $id2_date) {
if ($id1_date == $id2_date) { // merge scores if dates match
$from_games[$key1] += $to_games[$key2];
$from_wins[$key1] += $to_wins[$key2];
$from_points[$key1] += $to_points[$key2];
$this->db->query("UPDATE ".$this->dbprefix."score SET `games`=".$from_games[$key1].", `wins`=".$from_wins[$key1].", `points`=".$from_points[$key1]." WHERE `id`=".$id1." AND `channel`='".$gamechan."' AND `date_archive`='".$id1_date."'");
break;
}
}
}
$this->db->query("DELETE FROM ".$this->dbprefix."score WHERE `id`=".$id2); // delete all entries for the duplicated account
謝謝,會這樣做:) – shroom 2011-03-12 16:14:57
多一件事,而不是DELETE FROM考慮使用TRUNCATE TABLE - 如果沒有觸發器應該是執行,這是一種比DELETE更快的方式 – 2011-03-12 16:19:51
是的,我在其他情況下使用它,但在這裏我需要刪除選定的條目。 感謝您的投入:) – shroom 2011-03-12 16:34:13