在jsp中使用AJAX更新数据库记录不会显示

I am using AJAX for getting a list of users in a list box, from a servlet. When I click any of the list items(now usernames),corresponding record of that user is shown up in text boxes. After making some changes, if any, in the text boxes, I need to press add button to send the data from text boxes to a servlet, so that the corresponding record can be updated in the database. I have done all these actions and it is working. But, after pressing add button when I again click that username in the list box , old data is being shown. What should I do? Please help me.I am using AJAX for getting a list of users in