$sql = "INSERT INTO toplist
(serverName, serverPassword, serverIp, serverPort, serverBanner,
serverShortDescription, serverDescription)
VALUES
('$_POST[serverName]', '$_POST[serverPassword]', '$_POST[serverIp]',
'$_POST[serverPort]', '$_POST[serverBanner]',
'$_POST[serverShortDescription]', '$_POST[serverDescription]')";
if (!mysql_query($sql, $con)) {
die('Error: ' . mysql_error());
}
echo "The server " . $_POST[serverName] . "," . $_POST[serverIp]
. " has been added.";
mysql_close($con);
我怎样才能这样做,如果条目"serverIp"尚不存在,它将把它添加到数据库,如果它已经存在,那么它什么都不做.此外,这也是区分大小写的吗？你是否可以绕过它,因为它有什么好处？