How to add a blank row into a datatable

Question

i hava adatatable which contains the datas from database.i need to add a new data so that i need a blank row which contain the same number of columns in the existing datatable.
Pls Help..

Answer 1

sorry i am a beginner in jsf..
In the crud Example i saw a code in MyCrudBean.java.i wrote the code like that but the same stage only one row is coming i cant add n items .
* Department.java
* Created on Nov 22, 2007, 4:43:12 PM
package datatable;
import Item.DeptDatabase;
import com.sun.rave.web.ui.appbase.AbstractPageBean;
import com.sun.webui.jsf.component.Body;
import com.sun.webui.jsf.component.Form;
import com.sun.webui.jsf.component.Head;
import com.sun.webui.jsf.component.Html;
import com.sun.webui.jsf.component.Link;
import com.sun.webui.jsf.component.Page;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import javax.faces.FacesException;
import javax.faces.component.html.HtmlDataTable;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;
public class Department extends AbstractPageBean {
Connection con = null;
PreparedStatement StmtRateSel = null;
ResultSet rs = null;
private List<DeptDatabase> list = new ArrayList();
private int addCount = 1;
private HtmlDataTable myDataTable;
private static final int DEFAULT_TABLE_ROWS = 10;
// <editor-fold defaultstate="collapsed" desc="Managed Component Definition">
* <p>Automatically managed component initialization. <strong>WARNING:</strong>
* This method is automatically generated, so any user-specified code inserted
* here is subject to being replaced.</p>
private void _init() throws Exception {
private Page page1 = new Page();
public Page getPage1() {
return page1;
public void setPage1(Page p) {
this.page1 = p;
private Html html1 = new Html();
public Html getHtml1() {
return html1;
public void setHtml1(Html h) {
this.html1 = h;
private Head head1 = new Head();
public Head getHead1() {
return head1;
public void setHead1(Head h) {
this.head1 = h;
private Link link1 = new Link();
public Link getLink1() {
return link1;
public void setLink1(Link l) {
this.link1 = l;
private Body body1 = new Body();
public Body getBody1() {
return body1;
public void setBody1(Body b) {
this.body1 = b;
private Form form1 = new Form();
public Form getForm1() {
return form1;
public void setForm1(Form f) {
this.form1 = f;
// </editor-fold>
* <p>Construct a new Page bean instance.</p>
public Department() {
public void deptsave() throws SQLException{
connection();
StmtRateSel      = con.prepareStatement("execute prcPnsDepartmentIns");
rs = StmtRateSel.executeQuery();
con.close();
@Override
public void init() {
// Perform initializations inherited from our superclass
super.init();
// Perform application initialization that must complete
// before managed components are initialized
// TODO - add your own initialiation code here
// <editor-fold defaultstate="collapsed" desc="Managed Component Initialization">
// Initialize automatically managed components
// Note - this logic should NOT be modified
try {
_init();
} catch (Exception e) {
log("Department Initialization Failure", e);
throw e instanceof FacesException ? (FacesException) e: new FacesException(e);
// </editor-fold>
// Perform application initialization that must complete
// after managed components are initialized
// TODO - add your own initialization code here
* <p>Callback method that is called after the component tree has been
* restored, but before any event processing takes place. This method
* will <strong>only</strong> be called on a postback request that
* is processing a form submit. Customize this method to allocate
* resources that will be required in your event handlers.</p>
@Override
public void preprocess() {
* <p>Callback method that is called just before rendering takes place.
* This method will <strong>only</strong> be called for the page that
* will actually be rendered (and not, for example, on a page that
* handled a postback and then navigated to a different page). Customize
* this method to allocate resources that will be required for rendering
* this page.</p>
@Override
public void prerender() {
* <p>Callback method that is called after rendering is completed for
* this request, if <code>init()</code> was called (regardless of whether
* or not this was the page that was actually rendered). Customize this
* method to release resources acquired in the <code>init()</code>,
* <code>preprocess()</code>, or <code>prerender()</code> methods (or
* acquired during execution of an event handler).</p>
@Override
public void destroy() {
* <p>Return a reference to the scoped data bean.</p>
* @return reference to the scoped data bean
protected SessionBean1 getSessionBean1() {
return (SessionBean1) getBean("SessionBean1");
* <p>Return a reference to the scoped data bean.</p>
* @return reference to the scoped data bean
protected RequestBean1 getRequestBean1() {
return (RequestBean1) getBean("RequestBean1");
* <p>Return a reference to the scoped data bean.</p>
* @return reference to the scoped data bean
protected ApplicationBean1 getApplicationBean1() {
return (ApplicationBean1) getBean("ApplicationBean1");
private void connection() {
try{
Context ctx = new InitialContext();
System.out.println("context"+ctx);
if(ctx == null )
throw new Exception("Boom - No Context");
DataSource ds = (DataSource)ctx.lookup("BiteRiteJNDI");
if (ds != null) {
con = ds.getConnection();
System.out.println("connnn"+con);
catch(Exception e)
{System.out.println(e);}
public void addDataItem() {
while (addCount-- > 0) {
DeptDatabase myNewDataItem = new DeptDatabase();
//myNewDataItem.setEditMode(true);
list.add(myNewDataItem);
//log(myDataList);
// Reset counter and go to last page.
addCount = 1;
// log(myDataList);
// Reset counter and go to last page.
//addCount = DEFAULT_ADD_COUNT;
pageLast();
System.out.println("in add itm");
// list.add(new DeptDatabase());
public List getListtt(){
return list;
public HtmlDataTable getMyDataTable() {
if (myDataTable == null) {
myDataTable = new HtmlDataTable();
myDataTable.setRows(DEFAULT_TABLE_ROWS);
return myDataTable;
private static void log(Object object) {
System.out.println("bejoy"+new Exception().getStackTrace()[1].getMethodName() + ": " + object);
public void pageLast() {
System.out.println("in Page last");
int count = myDataTable.getRowCount();
System.out.println("count"+count);
int rows = myDataTable.getRows();
System.out.println("rows"+rows);
if (rows != 0) { // Prevent ArithmeticException: / by zero.
System.out.println("not equals zero");
myDataTable.setFirst(count - ((count % rows != 0) ? count % rows : rows));
log(new Integer(myDataTable.getFirst()));
public void setListtt(List<DeptDatabase> list) {
this.list = list;
* CRUD table: set datatable.
* @param myDataTable The datatable.
public void setMyDataTable(HtmlDataTable myDataTable) {
this.myDataTable = myDataTable;
jsp
<?xml version="1.0" encoding="UTF-8"?>
<!--
Document : Department
Created on : Nov 22, 2007, 4:43:11 PM
Author : Administrator
-->
<jsp:root version="2.1" xmlns:f="http://java.sun.com/jsf/core" xmlns:h="http://java.sun.com/jsf/html" xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:webuijsf="http://www.sun.com/webui/webuijsf">
<jsp:directive.page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"/>
<f:view>
<webuijsf:page binding="#{Department.page1}" id="page1">
<webuijsf:html binding="#{Department.html1}" id="html1">
<webuijsf:head binding="#{Department.head1}" id="head1">
<webuijsf:link binding="#{Department.link1}" id="link1" url="/resources/stylesheet.css"/>
</webuijsf:head>
<webuijsf:body binding="#{Department.body1}" id="body1" style="-rave-layout: grid">
<webuijsf:form binding="#{Department.form1}" id="form1">
<h:dataTable binding="#{Department.myDataTable}" id="myDataTable" value="#{Department.listtt}" var="dataItem">
<h:column>
<f:facet name="header">
<h:outputText value="Departments"/>
</f:facet>
<h:inputText value="#{dataItem.department}"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="StockItem"/>
</f:facet>
<h:inputText value="#{dataItem.stockItem}"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="StockUnit"/>
</f:facet>
<h:inputText value="#{dataItem.stockUnit}"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="MaxStock"/>
</f:facet>
<h:inputText value="#{dataItem.maxStock}"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="MinStock"/>
</f:facet>
<h:inputText value="#{dataItem.minStock}"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="ReorderLevel"/>
</f:facet>
<h:inputText value="#{dataItem.reorderlevel}"/>
</h:column>
</h:dataTable>
<h:commandButton action="#{Department.addDataItem}" value="Add"/>
</webuijsf:form>
</webuijsf:body>
</webuijsf:html>
</webuijsf:page>
</f:view>
</jsp:root>
i dont know wats the problem??
pls send a sample code to add n items