我只是在$ _POST [value]不为null时才尝试更新表Users . 如果为null,则列中已存在的值应保留 .
$query = "UPDATE `Users`
SET FirstName = COALESCE(:firstName, FirstName), LastName = ISNULL(:lastName, LastName), City = :city, State = :state WHERE Email = :email";
$stmt = $dbh->prepare($query);
$stmt->bindValue(':firstName', $firstName);
$stmt->bindValue(':lastName', $lastName);
$stmt->bindValue(':city', $city);
$stmt->bindValue(':state', $state);
$stmt->bindValue(':email', $email);
$stmt->execute();
我为FirstName列尝试了COALESCE,为LastName尝试了ISNULL . COALESCE用空格(NULL)替换我的值,这与我想要的完全相反,ISNULL似乎不起作用 .
1 回答
假设你的意思是
COALESCE
正在用空格('')替换FirstName,那么尝试使用NULLIF
:我假设POST发布了一个空白 .
祝好运 .