php - PDO - 将大数组插入 MySQL 数据库

Question

我需要一些帮助来改进我当前的代码。我有一个巨大的数组(里面大约有 20,000 个对象)。该数组如下所示:

  Array
(
    [0] => Player Object
        (
            [name] => Aaron Flash
            [level] => 16
            [vocation] => Knight
            [world] => Amera
            [time] => 900000
            [online] => 1
        )

    [1] => Player Object
        (
            [name] => Abdala da Celulose
            [level] => 135
            [vocation] => Master Sorcerer
            [world] => Amera
            [time] => 900000
            [online] => 1
        )

    [2] => Player Object
        (
            [name] => Ahmudi Segarant
            [level] => 87
            [vocation] => Elite Knight
            [world] => Amera
            [time] => 900000
            [online] => 1
        )

    [3] => Player Object
        (
            [name] => Alaskyano
            [level] => 200
            [vocation] => Royal Paladin
            [world] => Amera
            [time] => 900000
            [online] => 1
        )

    [4] => Player Object
        (
            [name] => Aleechoito
            [level] => 22
            [vocation] => Knight
            [world] => Amera
            [time] => 900000
            [online] => 1
        )

依此类推...总共有大约 20,000 个 Player Object。

现在我想将它们全部插入到我的数据库中。我想找到一种不遍历所有玩家的方法。它导致了很多性能问题，几乎要毁了我的电脑。我想在一次查询中完成。

但是我如何才能在不循环遍历的情况下获取玩家对象的属性，例如每个对象的“名称”、“级别”和“职业”？

我的代码是这样的:

// Insert player list to database
$sql = $db->prepare("INSERT INTO players (name, level, vocation, world, month, today, online) VALUES (:name, :level, :vocation, :world, :time, :time, :online) ON DUPLICATE KEY UPDATE level = :level, vocation = :vocation, world = :world, month = month + :time, today = today + :time, online = :online");

foreach ($players as $player) {
  $query = $sql->execute([
    ":name" => $player->name,
    ":level" => $player->level,
    ":vocation" => $player->vocation,
    ":world" => $player->world,
    ":time" => $player->time,
    ":online" => $player->online
  ]);
}

因为现在在底部的 foreach 上，它正在遍历我数组中的 20,000 个玩家对象，并获取他们的名字/级别/职业/世界等等。

有更好的方法吗？我这样做的方式不可能是最好的解决方案。我能听到我的 PC 正在重载工作，感觉它好像快要崩溃了。

Answer 1

虽然我仍然怀疑事务和/或批量插入是否是解决资源使用问题的可行解决方案，但它们仍然比像 Dave 建议的那样准备大量语句更好的解决方案。

试一试，看看它们是否有帮助。

以下假设PDO的错误处理方式设置为抛出异常。例如:$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 如果由于某种原因，你不能使用异常模式，那么你需要检查 execute() 每次都抛出你自己的异常。

单笔交易:

$sql = $db->prepare("INSERT INTO players (name, level, vocation, world, month, today, online) VALUES (:name, :level, :vocation, :world, :time, :time, :online) ON DUPLICATE KEY UPDATE level = :level, vocation = :vocation, world = :world, month = month + :time, today = today + :time, online = :online");

$db->beginTransaction();
try {
    foreach ($players as $player) {
        $sql->execute([
            ":name" => $player->name,
            ":level" => $player->level,
            ":vocation" => $player->vocation,
            ":world" => $player->world,
            ":time" => $player->time,
            ":online" => $player->online
        ]);
    }
    $db->commit();
} catch( PDOException $e ) {
    $db->rollBack();
    // at this point you would want to implement some sort of error handling
    // or potentially re-throw the exception to be handled at a higher layer
}

批量交易:

$batch_size = 1000;
for( $i=0,$c=count($players); $i<$c; $i+=$batch_size ) {
    $db->beginTransaction();
    try {
        for( $k=$i; $k<$c && $k<$i+$batch_size; $k++ ) {
            $player = $players[$k];
            $sql->execute([
                ":name" => $player->name,
                ":level" => $player->level,
                ":vocation" => $player->vocation,
                ":world" => $player->world,
                ":time" => $player->time,
                ":online" => $player->online
            ]);
        }
    } catch( PDOException $e ) {
        $db->rollBack();
        // at this point you would want to implement some sort of error handling
        // or potentially re-throw the exception to be handled at a higher layer
        break;
    }
    $db->commit();
}