- upsert(update or insert), 即更新或写入。
- MySQL中实现upsert操作方式:
思路:通过判断插入的记录里是否存在主键索引或唯一索引冲突,来决定是插入还是更新。当出现主键索引或唯一索引冲突时则进行update操作,否则进行insert操作。
实现:使用 ON DUPLICATE KEY UPDATE
来看看下面具体实现过程。
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CREATE TABLE `demo` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`a` tinyint(1) unsigned NOT NULL DEFAULT '0',
`b` tinyint(1) unsigned NOT NULL DEFAULT '0',
`c` tinyint(1) unsigned NOT NULL DEFAULT '0',
`d` tinyint(1) unsigned NOT NULL DEFAULT '0',
`e` tinyint(1) unsigned NOT NULL DEFAULT '0',
`f` tinyint(1) unsigned NOT NULL DEFAULT '0',
PRIMARY KEY (`id`),
UNIQUE KEY `unq_a_b_c` (`a`,`b`,`c`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=latin1;
注意:表中存在两处索引,id为主键索引,a,b,c为联合唯一索引。
insert into test.demo(a,b,c,d,e,f) values(1,1,1,1,1,1);
此时存在由abc散列组成唯一索引数据:1,1,1。
insert into demo(a,b,c,d,e,f) values(1,1,1,2,2,2) ON DUPLICATE KEY UPDATE a=2,b=2,c=3,d=4,e=5,f=6;
因为已经存在由abc三列组成唯一索引数据:1,1,1,本次又写入demo(a,b,c,d,e,f) values(1,1,1,2,2,2),会造成唯一索引冲突。
因此,会触发ON DUPLICATE KEY 后面的 UPDATE a=2,b=2,c=3,d=4,e=5,f=6操作。
至此,已经实现upsert功能。请记住 ON DUPLICATE KEY UPDATE的用法。
insert into statistic_customer(customer_id,current_period,period_number,client_upload_bill,update_time) values
(1,201604,100,100,1540470829),
(314,201604,100,100,1540470829),
(315,201604,100,100,1540470829),
(316,201611,100,100,1540470829)
ON DUPLICATE KEY UPDATE
customer_id=values(customer_id),
current_period=values(current_period),
period_number=values(period_number),
client_upload_bill=values(client_upload_bill),
update_time=values(update_time)
public static function test()
{
$updateData = [
[
'customer_id' => 1,
'current_period' => 201604,
'period_number' => 100,
'client_upload_bill' => 100,
'update_time' => time(),
],
[
'customer_id' => 314,
'current_period' => 201604,
'period_number' => 100,
'client_upload_bill' => 100,
'update_time' => time(),
],
[
'customer_id' => 315,
'current_period' => 201604,
'period_number' => 100,
'client_upload_bill' => 100,
'update_time' => time(),
],
['customer_id' => 316,
'current_period' => 201611,
'period_number' => 100,
'client_upload_bill' => 100,
'update_time' => time(),
],
];
$sql = self::buildSQL('statistic_customer', $updateData);
DB::insert($sql);
}
private static function buildSQL(string $tableName, array $updateData): string
{
$sql = "insert into {$tableName}(";
$keys = array_keys($updateData[0]);
$sql .= implode(',', $keys);
$sql .= ') values';
$valuesStr = '';
foreach ($updateData as $value) {
$valuesStr .= '(' . implode(',', array_values($value)) . '),';
}
$sql .= rtrim($valuesStr, ',');
$sql .= ' ON DUPLICATE KEY UPDATE ';
$updateStr = '';
foreach ($keys as $key) {
$updateStr .= "{$key}=values($key),";
}
$sql .= rtrim($updateStr, ',');
return $sql;
}