我有以下查询，用于为我的用户制作图表。唯一的问题是有时这会使服务器过载，我可能会挂起查询。
我注意到山羊的答案允许使用基本查询方法的狡猾的mysqli连接：
How to set a maximum execution time for a mysql query?
但是，出于安全原因，我希望能够使用预准备语句。异步查询的文档非常有限。
如何使用预处理语句集成异步mysqli，这些语句将在执行时间限制内返回尽可能多的行？
$query = "
SELECT
t1.day AS day,
COALESCE(t1.amount,0) AS earnings,
COALESCE(t2.amount,0) AS publisher_referral_earnings,
COALESCE(t3.amount,0) AS advertiser_referral_earnings
FROM
(
SELECT DATE_FORMAT(earning_created, '%c/%e/%Y') AS day, SUM(earning_amount) AS amount
FROM earnings
WHERE earning_referral_id = 0
AND (earning_created > DATE_SUB(now(), INTERVAL 30 DAY))
AND earning_account_id = ?
GROUP BY DATE(earning_created)
) t1
LEFT JOIN
(
SELECT DATE_FORMAT(ep.earning_created, '%c/%e/%Y') AS day, (SUM(ep.earning_amount) * rp.referral_share) AS amount
FROM earnings AS ep
INNER JOIN referrals AS rp
ON ep.earning_referral_id = rp.referral_id
WHERE ep.earning_referral_id > 0
AND (ep.earning_created > DATE_SUB(now(), INTERVAL 30 DAY))
AND ep.earning_account_id = ?
AND rp.referral_type = 0
GROUP BY DATE(ep.earning_created)
) t2
ON t1.day = t2.day
LEFT JOIN
(
SELECT DATE_FORMAT(ea.earning_created, '%c/%e/%Y') AS day, (SUM(ea.earning_amount) * ra.referral_share) AS amount
FROM earnings AS ea
INNER JOIN referrals AS ra
ON ea.earning_referral_id = ra.referral_id
WHERE ea.earning_referral_id > 0
AND (ea.earning_created > DATE_SUB(now(), INTERVAL 30 DAY))
AND ea.earning_account_id = ?
AND ra.referral_type = 1
GROUP BY DATE(ea.earning_created)
) t3
ON t1.day = t3.day
";
这是mysqli：
if ($statement = $mysqli->prepare($query))
{
$statement->bind_param("iii", $account_id, $account_id, $account_id);
$statement->execute();
$statement->store_result();
$timescales_total = $statement->num_rows;
$statement->bind_result($timescale, $earnings, $publisher, $advertiser);
$statement->free_result();
$statement->close();
}