Question

I am trying to get a count from a particular table in my derby database, but when I run the code I keep getting Invalid operation at current cursor position

    public int getNumUsers(){
    ResultSet rs = null;
    int size = -1;
    try {
        stmt = conn.createStatement();
        rs = stmt.executeQuery("select count(*) from USERS");
        while(rs.next()){
            size = rs.getInt("COUNT");
        }
        stmt.close();
    } catch (SQLException sqe) {
        sqe.printStackTrace();
    }
    return size;
}

Answer 1

give an alias to count(*) in your select statement. in mysql we use as to give alias name.I dunno about derby though, but think it’d be similar.

rs = stmt.executeQuery("select count(*) as count from USERS");
        while(rs.next()){
            size = rs.getInt("count");
        }