问题描述
该查询需要永远更新第二个表中的所有域。
$MysqLi = new MysqLi("localhost","xxxx","xxx");
if ($MysqLi -> connect_errno) {
echo "Failed to connect to MysqL: " . $MysqLi -> connect_error;
exit();
}
// Perform queries
$result = $MysqLi->query(SELECT disTINCT dom FROM pmcts_mt_pipeline_details);
$rows = $result->fetch_all(MysqLI_ASSOC);
foreach ($rows as $row) {
$dom = $row['dom'];
$MysqLi->query("UPDATE pmcts_email_marketing_companies_pharma_all_unique SET id_ind_mailer=1 WHERE email_dom='$dom' AND (mailerdaemon=0 AND mail_excluded=0 AND unsubscribe=0 AND changeto=0)");
}
解决方法
很可能不是查询变慢,而是循环。在 PHP 中循环很慢。
您想为所有匹配的行更新一个值,您可以使用 IN():
$result = $mysqli->query(SELECT DISTINCT dom FROM pmcts_mt_pipeline_details);
$rows = $result->fetch_all(MYSQLI_ASSOC);
$doms = array_column($rows,'dom'); // *
$domsString = implode("','",$doms)
* 我不是 100% 关于数组列,但目标是获取所有值-仅在数组中
UPDATE pmcts_email_marketing_companies_pharma_all_unique
SET id_ind_mailer=1
WHERE email_dom IN ('".$domsString."')
AND (
mailerdaemon=0
AND mail_excluded=0
AND unsubscribe=0
AND changeto=0
)
注意: 我假设您可以控制 $dom-values 并且它们对于 mysql 来说是干净和安全的。如果它们能够通过用户输入进行操作,请确保您进行了消毒,或者甚至更好:使用准备好的语句。