Help on JSP Paging

Question

Hi,
I am trying to display three records(out of 50) on every page but however when i run the JSP, there will be something wrong with the link and the records will not be shown according to it. Any idea why that happen?
Thanks in advance.
             <%
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            Connection conn = DriverManager.getConnection("jdbc:odbc:medi");
            Statement stmt = conn.createStatement();
            String sqlStr = "SELECT * FROM medi";
            ResultSet rs = stmt.executeQuery(sqlStr);
            int size = 0;
            int nprev = 3;
            int npage = 1;
        %>
        <center>
            <%
            while (rs.next()) {
                size = rs.getInt(1);
            int pages_needed = 0;
            pages_needed = size / 3;
            int remain = size % 3;
            if (remain != 0) {
                pages_needed += 1;
            } else {
                pages_needed = pages_needed;
            int cpage;
            int currentRs;
            String input;
            input = request.getParameter("id");
            out.println(input);
            if (input == null) {
            } else {
                cpage = Integer.parseInt((String) input);
                npage += 1;
                nprev += 3;
                out.println(nprev);
            String bo = "select * from medi where id <" + nprev + " and id >= " + npage + "";
            ResultSet rst = stmt.executeQuery(bo);
            %>
            <table bgcolor=yellow cellspacing =4 cellpadding=4 border="1">
                <tr>
                    <td>ID</td>
                    <td>Staff</td>
                </tr>
                <%
            while (rst.next()) {
                %>
                <tr>
                    <td><%=rst.getInt(1)%></td>
                    <td><%=rst.getString(2)%></td>
                </tr>
                <%}
                %>
            </table>
            <p>
            <%
            int p;
            for (p = 1; p <= 17; p++) {
                out.println("<a href=proc.jsp?id=" + p + ">" + p + "</a> | ");
            %>
           

Answer 1

The DisplayTag library is very easy to use but has some drawbacks, the main one being that paging is performed on the client tier, viz. that all records will be loaded from the database on each request and then the subset to display will be extracted and output.
More sophisticated solutions page as records are loaded from the database, viz. if records 90-100 are to be displayed then only those records will be loaded.
Maybe good enough for what you are looking for. Have some built-in PDF Excel export functionality.
http://displaytag.sourceforge.net/1.2/