when updating the data that is being updated is duplicated

I'm creating a login form and has functions of edit, delete and saving the data. The problem is in the edit or update part, when i'm about to edit for example a username, then i clicked the button edit the edited version is being saved as well as the data that is to be edited. So when i edit a data there is a duplication.

This is my code for the edit part. I'm using flash cs6 and sqlite.

   function update(MouseEvent):void
           {
            var stat:SQLStatement = new SQLStatement();
            stat.sqlConnection = connection;
            stat.text = "UPDATE player SET fname=@fname,
            dateplayed=@dateplayed, timein=@timein 
            WHERE fname=" + itemList.selectedItem.data.idd;
            stat.parameters["@fname"] = fname.text;
            stat.parameters["@dateplayed"] = dateplayed.text;
            stat.parameters["@timein"] = timein.text;
            stat.execute(-1, new Responder(selectItems));
            fname.text =  "";
            dateplayed.text =  "";
            timein.text =  "";
         } 

Hope you could help me, i'm just a newbie in flash. Thanks in advance