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refresh the jsp page

I am now doing my project. I am doing the chief part. The chief's jsp page will display the menu table include column(itemID,name,quantity).  The chief is able to view the jsp page which will refresh  whenever there is any updated column, quantity from the database(done by another member which will insert the quantity when people want any order)
Finally once the chief have finish cooking, the chief will click on the minus button to minus off the quantity from the database column.

Therefore i need help for the coding on

1) refresh jsp page whenever there is any updated quantity in the column from the database.

2) minus button use to minus no. of quantity from the database

Thank You!!!
1 Solution
you want the jsp page to refresh when the columun updates?
I don't think you can do that..
the code for the minus would be something like this..The id will be a unique value of the order maybe order number or something

<form action="process.jsp?id=12342" method="post">
<input type="submit" value="Minus" />

String id = request.getParameter("id");
//Open connection to the database
String sqlQuery1 = "Select quantity from table_name where quantity='" + id + "'";
rs = stat.exectueQuery(sqlQuery1);

if(rs.next()) {
    int qty = rs.getInt("quantity");
    String sqlQuery2 = "Update table_name set quantity='" + (qty - 1) +"'";
    int result = stat.executeUpdate(sqlQuery2);

No comment has been added to this question in more than 21 days, so it is now classified as abandoned..
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   ACCEPT: copyPasteGhost

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