PHP / MySQL - 使用会话数据更新表数据

Question

How to update table data with data stored in session?

I have following code but it is not working(INSERTING INTO DB not working exactly). Please not that this is just part of the code. Session value are being saved correctly. I have a problem with saving them though.

If I have made silly mistake - apologies - I'm newby.

    $loggedTime = $_SESSION['loggedtime'];
    $thisUser = $_SESSION['usr'];

    $result = mysql_query("UPDATE 'admin' SET dt = $loggedTime WHERE $thisuser");
    if($result) {
         echo "success"; 
    } else { 
        echo "no success"; 
    }

Answer 1

"UPDATE `admin` SET `dt` = '$loggedTime' WHERE user = '$thisUser'"

Don't use single quotes around column/table names. Single/double quotes indicate string literals. Use back ticks around table/column names, if you have to (i.e. reserved word). Also, have a look at Bobby Tables. Furthermore, you need a column in the where clause.