Making Buttons appear depending on the results of a SQL Query

Question

I need some help here I am still working on a time clock program
I need help with the clock in and out buttons i need to know how to make
the clock in button appear only if they are not clocked in. But I can not seem
to make the sql statement or maybe my code is wrong, it needs to just get a
count to see if they have any entries that have 0 in the hoursworked column
and if so then it needs to just display the clock out if not then just the clockin button needs to be displayed this was my orignal code that was not working
<%   
    String statement = "select count(*) as cnt from TimeSheet Where idnum = " + session.getAttribute("IDNUM");
    stmt.execute(statement);
    rs = stmt.getResultSet();
    rs.next();
    int num = rs.getInt("cnt");
    if (num == 0 || num == null)
    {%>
        <tr>
            <td><input type="submit" value="Clock In" name="button"></td>
        </tr>
    <%}
    else
    {%>
        <tr>
            <td><input type="submit" value="Clock Out" name="button"></td>
        </tr>
     <% } %>but it did not work it would only display the clock out button so i need to figure this out so that the user can not clock into the program twice to get double hours and so forth.

Answer 1

Does it even compile ?Yes, it wouldnt, not even in 1.5
it needs to just get a
count to see if they have any entries that have 0 in the hoursworked column
and if so then it needs to just display the clock out if not then just the clockin button needs to be displayed in which case,
1. your sql is not correct.
2. session.getAttribute("attrName") returns an Object - is the IDNUM column of type number
(going by the fact that you have not enclosed the value in single quotes '')
Assuming that you have a column called 'hoursworked' in table 'timesheet' and
IDNUM is of type NUMBER
<%
     Integer idNum = (Integer)session.getAttribute("IDNUM");
     //from the OP ::  get a count to see if they have any entries that have 0 in the hoursworked column
     String statement = "select count(*) as CNT from TIMESHEET where IDNUM = " + idNum + " and HOURSWORKED = 0 ";
     //remaining stuff :: Look out for the error pointed out by Pgeuens
     cheers,
ram.