Having trouble allowing people to BUMP a unique entry in table - php

Question

So, my table has a bunch of codes in it and I don't want more than one of the same code in the table so I have it as "UNIQUE."
But, at the same time, I want them to be able to bump their code once every hour.
function some_more_custom_content() {
$output="<BR>";
ob_start();
if ($_REQUEST['code'] != "") {
$code = $_REQUEST['code'];
$query="INSERT INTO `fc` (`code`,`datetime`) values ('" . mysql_real_escape_string($code) . "', now())";
$result=mysql_query($query) or die(mysql_error());
$seconds = time() - strtotime($fetch_array["datetime"]);
if($sql){
echo("Intserted " . htmlentities($code) ." into the top.");
}else{
if ($seconds < 60*60) {
echo ("The code " . htmlentities($code) ." was updated less than an hour ago.");
} else {
$query="DELETE FROM `fc` (`code`,`datetime`) values ('" . mysql_real_escape_string($code) . "', now())";
echo ("Inserted " . htmlentities($code) ." into the top.");
}
}}
Now, I tried to get it so that when the code works it submits the code as normal, which I think works.
Now, if it gets a code that is already there I get the duplicate error "Duplicate entry 'Bob' for key 1"
But, I just want it to delete the old query that it found and to resubmit if it's been more than one hour since last submission.
Any ideas what I am doing wrong?

Answer 1

You can just update the date/time field in the database to reflect the time of the "bump".
if ($_REQUEST['code'] != "")
{
$code = $_REQUEST['code'];
$sql = "SELECT * FROM fc WHERE code = '" . mysql_real_escape_string($code) . "'";
$result = mysql_query($sql);
if (mysql_num_rows($result))
{
$row = mysql_fetch_array($result);
$seconds = time() - strtotime($row["datetime"]);
if ($seconds > 60*60)
{
$sql = "UPDATE fc SET datetime = NOW() WHERE code = '" . mysql_real_escape_string($code) . "'";
mysql_query($sql);
echo("Intserted " . htmlentities($code) ." into the top.");
}
else
{
echo ("The code " . htmlentities($code) ." was updated less than an hour ago.");
}
}
else
{
$sql = "INSERT INTO fc (code, datetime) VALUES ('" . mysql_real_escape_string($code) . "', NOW())";
mysql_query($sql);
echo("Intserted " . htmlentities($code) ." into the top.");
}
}
(I probably shouldn't have re-written your code for you, and there are a few more improvements that could be made, but that reflects the best changes I can make with the minimum of changes (does that make any sense?))

Answer 2

Frank, you do not need two different queries
$query="INSERT INTO `fc` (`code`,`datetime`)
values ('" . mysql_real_escape_string($code) . "', now())
ON DUPLICATE KEY UPDATE datetime = case when now() - interval 1 hour > `datetime`
then NOW()
else `datetime`
end";