我已经有很长一段时间了。我曾经读过,在逐个检查记录的情况下,在代码中使用循环比使用SQL查询(对数据库的访问时间比循环慢)更快,但我一直在测试一些逻辑,但我发现情况并非如此。(从查询中获得的数据返回得更快),那么对于这些情况,最理想的方法是什么?
他们向我提出的案件如下:
$payMethods = PayMethod::has('payments')->get();
$payments = collect();
foreach ($payMethods as $payMethod) {
$paid = 0;
if ($payMethod->bankProvider->provider->type == 1) {
foreach ($payMethod->payments as $payment) {
$paid += $payment->price;
}
}
$payments[$payMethod->name] = $paid;
}
return response()->json($payments);使用sql:
$payMethods = PayMethod::has('payments')->get();
$payments = collect();
foreach ($payMethods as $payMethod) {
$sql = 'SELECT ROUND(SUM(a.price), 2) AS amount FROM payments a
JOIN paymethods b ON a.paymethod_id = b.id
JOIN bank_provider c ON b.bank_provider_id = c.id
JOIN providers d ON c.provider_id = d.id
WHERE d.`type` = 1 AND a.paymethod_id = :paymethod_id AND a.deleted_at IS NULL';
$paid = DB::select($sql, ['paymethod_id' => $payMethod->id]);
$payments[$payMethod->name] = $paid[0]->amount;
}
return response()->json($payments);注意:测试是用chrome进行的,两者之间的差异非常明显,这有利于使用sql (与循环相比减少了5-6秒)。
发布于 2019-11-18 17:25:38
基本上,由于mysql服务器的成本和响应时间,发送一个查询要比发送多个查询好,但在您的情况下,您使用的是某种ORM,而且由于延迟加载,您可能会有N+1 (或更糟的)查询(您可以读到)
https://stackoverflow.com/questions/58919917
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