如果行存在,则更新 MySQL 表的最快方法,否则插入.超过 2 个非唯一键
我的表结构如下:
CREATE TABLE IF NOT EXISTS `reports` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`day` int(11) NOT NULL,
`uid` int(11) NOT NULL,
`siteid` int(11) NOT NULL,
`cid` int(3) NOT NULL,
`visits` int(11) NOT NULL,
PRIMARY KEY (`id`)
)
目前我检查 &使用以下代码段插入/更新:
Currently i check & insert/update with the following snippet:
$checkq = mysql_query("SELECT count(*) as rowexist FROM reports WHERE day='$day' AND uid='$uid' AND siteid='$sid' AND cid='$cid'") or die(mysql_error());
$checkr = mysql_fetch_array($checkq);
if ($checkr['rowexist'] > 0) {
mysql_query("UPDATE reports_adv SET visits=visits+1 WHERE day='$day' AND uid='$uid' AND siteid='$sid' AND cid='$cid'");
} else {
mysql_query("INSERT INTO reports_adv SET day='$day', uid='$uid', siteid='$sid', cid='$cid', visits='1'");
}
如果行存在,否则使用超过 2 个非唯一键插入是否是更新此 MySQL 表的最快方法?
Is a fastest way to update this MySQL table if row exists else insert with more than 2 non-unique keys?
推荐答案
只需使用 INSERT...ON DUPLICATE KEY UPDATE
INSERT INTO reports_adv (day, uid, siteid, cid, visits)
VALUES ('$day', '$uid', '$sid', '$cid', 1)
ON DUPLICATE KEY UPDATE visits=visits+1;
- INSERT ... ON DUPLICATE KEY UPDATE语法李>
但在此之前,您应该在列上定义
UNIQUE
约束.but before anything else, you should define a
UNIQUE
constraint on the columns.ALTER TABLE reports_adv ADD CONSTRAINT tb_uq UNIQUE (day, uid, siteid, cid)
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