Updating and reading same column with PreparedStatement

Question

sqlStr = "UPDATE user_mstr SET userid=?, username=?, duration=?, location=?, expiry_date=?, remainder_days=? WHERE userid=?";
stmt = DBConnection.getPreparedStatement(conn,sqlStr);
stmt.setString(1,strUserid);
stmt.setString(2,strUsername);
stmt.setString(3,strDuration);
stmt.setString(4,strLocation);
stmt.setDate(5,sqlDate);
stmt.setString(6,strRemainderDays);
stmt.setString(7,strUserid);
int rowcount = stmt.executeUpdate();This is the problem i'm facing right now: A numberformatexception is always thrown, meaning that the statement did not execute properly.
There is nothing wrong with the SQL, because i've used the query analyzer, and the record was updated fine.
There is also nothing wrong with the date field because when i took the code for updating the date column out, the update was fine too.
So what could be wrong here? Is it because double usage of userid in the preparedstatement? I think that is the problem, because when i did not update the userid, the update is fine. Is it that, i cannot update a field that is currently being used when using a prepared statement?
Is there a way to go around this besides adding another recordid column?
Thanks all.
Edited by: tsek1125 on Nov 13, 2007 8:58 PM

Answer 1

if(rowcount > 0){
                        response.sendRedirect("updated.jsp");
}else {
                        throw new NumberFormatException("");
}Sorry BalusC, I forgot to post this portion: the NFE occurs only because the statement did not execute properly.. This portion is right after the first code chunk that i've posted.
Using the Netbeans debugger, i found out that all the fields are 'correct'. And that the NFE is thrown by: int rowcount = stmt.executeUpdate() Which leaves me to wonder what the problem is.
The userid is actually a string and not a real 'id', duration and remainder days are integers.
To clarify, now i've narrow the problem to: when i choose to update the userid column, it does not work. (and i think this is due to the part of the sql statement "WHERE userid = ?")
Why is a possible reason and solution? Thanks for your help :)
*/