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当我使用 PHP 和 Propel ORM 2.0.0-dev 以可时间戳行为更新表中的行时，它总是设置 created_at 字段以及 updated_at 字段，这意味着它们总是相同的。我希望 created_at 反映该行的创建时间，而不是上次修改的时间。这是我的代码，我做错了什么？

$person = PeopleQuery::create()->findOneByUserid($vals->userid); 
if (is_null($person)) $person = new People();
$person->setUserid($vals->userid);
$person->setAddress($vals->address);
$person->setCity($vals->city);
$person->setState($vals->state);
$person->setZip($vals->zip);
$person->setCountry($vals->country);
$person->setClientIP($vals->clientIP);
$person->save();

桌子：

<table name="people" idMethod="native" phpName="People">
<column name="userid" phpName="Userid" type="INTEGER" primaryKey="true" required="true"/>
<column name="address" phpName="Address" type="VARCHAR" required="true"/>
<column name="city" phpName="City" type="VARCHAR" required="true"/>
<column name="state" phpName="State" type="VARCHAR" required="true"/>
<column name="zip" phpName="Zip" type="VARCHAR" required="true"/>
<column name="country" phpName="Country" type="VARCHAR" required="true"/>
<column name="clientIP" phpName="ClientIP" type="VARCHAR"/>
<vendor type="mysql">
<parameter name="Engine" value="InnoDB"/>
</vendor>
<behavior name="timestampable" />
</table>

在我们更新时将代码更改为不触及主键列不会阻止 Propel 更新 created_at 字段：

$person = PeopleQuery::create()->findOneByUserid($vals->userid); // so that it does both inserts and updates
if (is_null($person)) {
    $person = new People();
    $person->setUserid($vals->userid);
    echo '<p>Did NOT find person</p>';
} else {
    echo '<p>Found person</p>';
}
$person->setAddress($vals->address);
$person->setCity($vals->city);
$person->setState($vals->state);
$person->setZip($vals->zip);
$person->setCountry($vals->country);
$person->setClientIP($vals->clientIP);
$person->save();
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