Question

Let’s say I have a table like this

 ID |      DATETIME       | VALUE
 1  | 2011-12-10 01:22:46 |   NO

and for example real DATETIME now is 2011-12-10 00:22:46
I want the VALUE updated to YES when the DATETIME now is the same with the DATETIME on the table.

how to do this?

Answer 1

use jquery ajax to make a heartbeating to the server each lets say half second in order to work with the delay if happens

1- download jquery or include it online

2- right this in a page that always opened I will give another solution if its not open

function updater()
{
    $.post('ajaxChecker.php');

}

setInterval( "updater()", 50 );

the above code send a request to page named ajaxChecker.php
then you need in that page to connect to the database
I will assume you now that
and in that
make a query

$query = mysql_query("UPDATE tlbname SET `value` = 'YES' WHERE `datetime` = NOW()

“);

Please check the reserved words for mysql and if you can’t modify them make sure they are between “

read about cronjobs to start it