Arun Gupta's Blog

Dynamic Data in jMaki Widgets Using JPA - Updated for formal data models

Doris pointed out that one of my earlier post is not working any more. That entry explained the steps to create a Web application, deployed on GlassFish V2, and contained a jMaki-wrapped Yahoo Data Table widget pulling data from JavaDB using the JPA.

The main reason for this is because jMaki data models have evolved since I wrote the original entry and are now formalized. Here is the delta from the previous entry to make it working:

1. Use the following code in bullet 6 instead:
   
   <%@ page import="java.util.*" %>
<%@ page import="server.Company" %>
<%@ page import="javax.persistence.*" %>

<%
  EntityManagerFactory emf = Persistence.createEntityManagerFactory("jmaki-jpaPU");
  EntityManager em = emf.createEntityManager();

  List<Company> list = em.createQuery("select c from Company c").getResultList();

  out.println("{columns : [" +
    "{ label : 'Company Name', id : 'companyName'}," +
    "{ label :'Price', id : 'price'}," +
    "{ label :'Change', id : 'change'}," +
    "{ label :'% Change', id : 'pctChange'}," +
    "{ label :'Last Updated', id : 'lastUpdated'}" +
    "],");

  out.println("rows: [");
  for (int i=0; i<list.size(); i++) {
    Company c = list.get(i);
    out.print("{ companyName: '" + c.getCompanyname() + "'," +
      "price: '" + c.getPrice() + "'," +
      "change: '" + c.getChange() + "'," +
      "pctChange: '" + c.getPercentchange() + "'," +
      "lastUpdated: '" + c.getLastupdated() + "'}");
      if (i < list.size()-1)
        out.println(",");
      else
        out.println();
  }
  out.println("] }");
%>
2. The new generated code fragment in bullet 7.2 is now:
   
    <a:widget name="yahoo.dataTable"
  service="data.jsp" />

With jMaki 0.9.7.1, here is a snapshot of the updated web page:

And the updated NetBeans project is available here.

Technorati: jmaki glassfish jpa netbeans

Comments

• Hi Arun,
  the example Dynamic Data in jMaki Widgets Using JPA is very useful . is it possible to display data using JSONArray
  both coloumns and rows shoould come from a bean i.e, coloumns and rows are dynamic. Kindly give me an idea how do I proceed.
  Thanks in Advance .
  Reddy

  Posted by: reddycm on May 21, 2008 at 06:36 AM

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