Struts, Best proctices to show data from database in view

Hi,
I am using Struts.
I need to show a result of select operation, some 50-60 records like a grid.
Best method to transfer ResultSet data to View(jsp) from the Action's execute method. Is it a right way to use a collection of objects, that contains the fields corresponding to the table, populate it first from resultset and iterate in JSP using jstl and <table> to show?
What is the best method, without altering the MVC?
Thanks

Going through the javaee tutorial is one sure way of accelerating your learning curve, as almost every basic you will need to get your job done is explaiined well in there. i have been using it to learn building enterprise application and is awesome good resource.
seriously consider downloading it
java.sun.com/javaee/5/docs/tutorial/doc/

Similar Messages

Best Practice on querying Data from Database

Hello and I was wondering what is the preferred and best practice for querying data from an SQL database inside a JSP page. Is it using the JSTL library or another method? Thanks

It depends on the size of the application really.
The "correct and preferred" approach in a large MVC app would be to have a seperate class that does all the database access, retrieving the data into java objects.
Check out [url http://java.sun.com/blueprints/corej2eepatterns/Patterns/DataAccessObject.html] DAO pattern
You then "save" the data into request/session attributes, and forward to a jsp page to render the result.
Most approaches recommend a separation between JSP (the view) and SQL code.
The JSTL sql tags are provided more for "quick and dirty" code applicable in small applications, or for fast prototyping. That approach is not really robust for large scale applications.
Cheers,
evnafets

How do i add data from database to JTable ! Urgent

How do i add data from database to the columns of JTable?.

hi,
Thanks for ur link. but this is just a part of my application which i am developing user interface in swing package for which i want to know how to show data to user in the table format where by table input data will be from the database. say something like todays activity is shown to the user in table format... So u have any idea of how to do this...

What could be the best way to Export data from 11.5.8 instance to 12.1.2?

Hi All
What could be the best way to Export data from 11.5.8 instance to 12.1.2?
Release: 11.5.8
OS: Oracle Solaris on SPARC (32-bit) verison 9
DB: 9.2.0.1
Thanks in advance

What kind of data you are looking to move?
Database export/import is only supported for full database export/import and the application release should be the same on the source/target nodes.
You can move the setup using iSetup or FNDLOAD.
Thanks,
Hussein

Problem in printing the data from database when i print inside servlet

hi to all!
the objective of the code below is getting the data from database table and has to send that data to the web browser using out.println .note: out - PrintWriter object
In a getQuestion method, i am getting the data from database table and store it in String q and when i print the q within this method it is getting printed, but i got the null value when i printed the String q inside service method doPost. why..? its puzzling me.
package servlet;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class test extends HttpServlet {
     Connection con;
     ResultSet rs;
     Statement s;
     StringBuffer q;
     StringBuffer o1;
     StringBuffer o2;
     StringBuffer o3;
     public void getQuestion() throws Exception
          if(rs.next())
               q=new StringBuffer(rs.getString("question"));
               o1=new StringBuffer(rs.getString("option1"));
               o2=new StringBuffer(rs.getString("option2"));
               o3=new StringBuffer(rs.getString("option3"));
               System.out.println(q);
               System.out.println(o1);
               System.out.println(o2);
               System.out.println(o3);
     public void connect(){
          try
          Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
          con=DriverManager.getConnection("jdbc:odbc:ds","sa","server");
          s=con.createStatement();
          rs=s.executeQuery("select * from qa order by newid()");
          getQuestion();
          catch(Exception e)
               System.out.println("erroe");
     public void doPost(HttpServletRequest request,HttpServletResponse response)
     throws IOException,ServletException
          response.setContentType("text/html");
          new test().connect();
          PrintWriter out=response.getWriter();
          request.setAttribute("question", q);
          request.setAttribute("option1", o1);
          request.setAttribute("option2", o2);
          request.setAttribute("option3", o3);
          //RequestDispatcher rd=getServletContext().getRequestDispatcher("/show.jsp");
          //rd.forward(request, response);
          out.println("<html>");
out.println("<head>");
     out.println("<title>" + "shock!!!" + "</title>");
out.println("</head>");
out.println("<body>");
out.println("<h2>"+"Read twice before u answer"+"<h2>");
out.println("<p></p>");
//why the value of q is not getting printed, instead i get null
out.println("<h2>"+ q +"<h2>");
out.println("how is it");
out.println("</body>");
out.println("</html>");
Edited by: Mahesh_yeswecan on Nov 29, 2008 10:42 AM

As u said , i have done a silly mistake earlier. though i have corrected the code still i am getting the same null value
package servlet;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class test extends HttpServlet {
     Connection con;
     ResultSet rs;
     Statement s;
     StringBuffer q;
     StringBuffer o1;
     StringBuffer o2;
     StringBuffer o3;
     public void getQuestion() throws Exception
          if(rs.next())
               q=new StringBuffer(rs.getString("question"));
               o1=new StringBuffer(rs.getString("option1"));
               o2=new StringBuffer(rs.getString("option2"));
               o3=new StringBuffer(rs.getString("option3"));
               System.out.println(q);
               System.out.println(o1);
               System.out.println(o2);
               System.out.println(o3);
     public void connect(){
          try
          Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
          con=DriverManager.getConnection("jdbc:odbc:ds","sa","server");
          s=con.createStatement();
          rs=s.executeQuery("select * from qa order by newid()");
          getQuestion();
          catch(Exception e)
               System.out.println("erroe");
     public void doPost(HttpServletRequest request,HttpServletResponse response)
     throws IOException,ServletException
          response.setContentType("text/html");
          connect();
          PrintWriter out=response.getWriter();
          request.setAttribute("question", q);
          request.setAttribute("option1", o1);
          request.setAttribute("option2", o2);
          request.setAttribute("option3", o3);
          //RequestDispatcher rd=getServletContext().getRequestDispatcher("/show.jsp");
          //rd.forward(request, response);
          out.println("<html>");
        out.println("<head>");
         out.println("<title>" + "shock!!!" + "</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("<h2>"+"Read twice before u answer"+"<h2>");
        out.println("<p></p>");
        //why the value of q is not getting printed, instead i get null
        out.println("<h2>"+ q +"<h2>");
        out.println("how is it");
        out.println("</body>");
        out.println("</html>");
}

Is it possible to show data from two different sql tables?

Is it possible to show data from two different sql tables? Either to show combined data by using a join on a foreign key or showing a typical master detail view?
I have one table With data about a house, and another table With URL's to images in the blob. Could these two be combined in the same Gallery?
Best regards Terje F - Norway

Hi Terje,
If you have a unique key, you could use one of the following functions for your scenarios:
If you only have one image per house, you can use LookUp:
http://siena.blob.core.windows.net/beta/ProjectSienaBetaFunctionReference.html#_Toc373745501
If you have multiple images per house, you can use Filter:
http://siena.blob.core.windows.net/beta/ProjectSienaBetaFunctionReference.html#_Toc373745487
Thanks
Robin

How to extract data from database to XSLT?

I want to generate a report by XSLT, but the data is extracted from the database. I will use Access/SQL server for my database. Can i write SQL in XSLT to extract data from database? Have any sample code or reference website to show how it work?
THX

for example: "SELECT code, name FROM TABLE FOR XML RAW"
String xml = null;
if(rs.next()){
xml = rs.getString(1);
}You will get xml string something like this:
<row empID="1234"/><row empID="1235"/>
You can construct a DOM using this xml data and operate on it.
However you may explore more on resulting xml format.
A different SQL Query (rather than using XML RAW) may give output in a more desired format.

How to retrieve data from database to the structure(complicated)

Hello everyone:
I want to retrieve data from database to the structure. but the structure defined like this below:
TOLERANZOB LIKE QAMV-TOLERANZOB
TOLERANZOB1 LIKE QAMV-TOLERANZOB
so how can I retrieve the data from the database ? make sure that the two fields contain data both.
Thanks in advance .
Regards
Nick

Hi Nick,
To retreive data for TOLERANZOB from QAMV,
If you know the key fields then use
SELECT SINGLE TOLERANZOB FROM QAMV INTO TOLERANZOB WHERE keyfields.
else, you can use
SELECT TOLERANZOB FROM QAMV UPTO ONE ROWS INTO TOLERANZOB WHERE....
Once you retreive the data using the select query, you can check if it is initial and if not move the data from TOLERANZOB to TOLERANZOB1.
<b>Reward points for helpful answers.</b>
Best Regards,
Ram.

Best LKM to move data from with in Oracle from one schema to another Schema

Hi Gurus,
What is the best KM to move data from one schema to another schema within same oracle database.
Thanks in advance

Dear,
If your source and target are on the same database server then you dont need LKM.
You have to 1. create one data server for the database server
2. Create one physical schema for your source and another physical schema for your target under the above created data server.
3. Then create models for each above created physical schema
In this case you just need IKM knowledge module
Please refer http://oditrainings.blogspot.in/2012/08/odi-interface-source-target-on-same.html
If your source and target are on different server then you must create two different data servers in topology. You have to use LKM.
The best LKM to use is LKM oracle to Oracle dblink. But you should have proper grants to use it
If your source has very few records you can go with LKM SQL to Oracle other wise use LKM oracle to Oracle dblink

Show data from sql server to oracle db

Hi,
I am using oracle 10g R1 on windows 2003 platform. On one machine database 10gR1 is running and on other machine sql server is running. I want to retrieve some data from sql server to oracle database. Please tell me how I can show data from sql server to oracle db.
Thanks

To make heterogeneous connection with oracle:
1.First make an ODBC connection, make entry in System DSN(to create a data source)
2.Make an entry in tnsnames.ora
3.Make an entry in listener.ora under SID_LIST_LISTENER
4.Make an entry in file named init<HS>.ora file located "oracle_base\oracle_home\db\hs\admin"
5.Restart the listener
e.g:
1. create a odbc system dsn named like 'sqlserver'
2. sqlserver= (DESCRIPTION=
(ADDRESS=(PROTOCOL=tcp) (HOST=xx.xx.xx.xx) (PORT=1521))
(CONNECT_DATA = (SERVICE_NAME=sqlserver))
(HS = OK)
3. (SID_DESC = (SID_NAME = sqlserver) (ORACLE_HOME = oracle_base\oracle_home\db) (PROGRAM = hsodbc) )
4.Create a file named initsqlserver.ora and make the following entry:
HS_FDS_CONNECT_INFO = sqlserver
Alternatively, you can copy the file named inithsodbc.ora and rename it to initsqlserver.ora
and edit as HS_FDS_CONNECT_INFO = sqlserver
5. lsnrctl reload listener_name
regards
adnan kaysar

Is there a way to retrieve data from database wihout using JDBC while using JPDK?

Hi,
I want to create a portlet using JPDK with extra render modes and edit/Edit defaults mode too. The detail and show renderer mode jsp's/servlets render data from database. Based on the personalized paramter, the data rendered in detail and show mode will be obtained from database.
The articles in the PDK zip asks not to use JDBC for security vulnerability. Does that mean , I should not use JDBC to connect to db to get data. If not, what should I use ? How do I connect to database ? Is there any class which helps to connect to db without using JDBC ?
thanks,
Mainak

I'm not sure what articles you are refering to, because there is no other way to access a database from a java program. Generally, security related docs tend to be a little paranoid (and so they should be), but you have to balance high security against getting the job done.
Obviously, if using JDBC, you need to be careful about protecting your config files because they will contain connection information.

Problem in populating jtable data from database

hi,
i am using JTable to retrieve data from database and show it in table. JTable
is working fine with static data. but while retrieving from databse its giving a NullPointerException at getColumnClass() method. Below is complete source code. plzz help.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.sql.*;
import javax.swing.table.*;
/*jdbc connection class*/
class connect
Connection con;
Statement stat;
public connect()throws Exception
Class.forName("org.postgresql.Driver");
con=DriverManager.getConnection("jdbc:postgresql://localhost/dl","dl","dl");
stat=con.createStatement();
public ResultSet rsf(String rsstr)throws Exception
ResultSet rs=stat.executeQuery(rsstr);
return rs;
public void upf(String upstr)throws Exception
stat.executeUpdate(upstr);
class MyTableModel extends AbstractTableModel
private String[] columnNames = {"name","id","dep","cat","rem","chkout"};
Object[][] data;
public MyTableModel()
try{
connect conn=new connect();
ResultSet rs3=conn.rsf("select * from usertab");
ResultSetMetaData rsmd=rs3.getMetaData();
int col=rsmd.getColumnCount();
int cou=0;while(rs3.next()){cou++;}
data=new Object[cou][col];
System.out.println(cou+" "+col);
ResultSet rs2=conn.rsf("select * from usertab");
int i=0;int j=0;
for(i=0;i<cou;i++)
rs2.next();
for(j=0;j<col;j++)
data[i][j]=rs2.getString(getColumnName(j));
System.out.println(data[0][2]);
}catch(Exception e){System.out.println("DFD "+e);}
        public int getColumnCount() {
            return columnNames.length;
        public int getRowCount() {
            return data.length;
        public String getColumnName(int col) {
            return columnNames[col];
        public Object getValueAt(int row, int col) {
            return data[row][col];
       public Class getColumnClass(int c) {
          return getValueAt(0, c).getClass();
        public boolean isCellEditable(int row, int col) {
            if (col < 2) {
                return false;
            } else {
                return true;
        public void setValueAt(Object value, int row, int col) {
            data[row][col] = value;
            fireTableCellUpdated(row, col);
class MyFrame extends JFrame
public MyFrame()
     setSize(600,500);
     JPanel p1=new JPanel();
     p1.setBackground(new Color(198,232,189));
     JTable table = new JTable(new MyTableModel());
     table.setPreferredScrollableViewportSize(new Dimension(500,200));
     table.setBackground(new Color(198,232,189));
     JScrollPane scrollPane = new JScrollPane(table);
     scrollPane.setBackground(new Color(198,232,189));
     p1.add(scrollPane);
     getContentPane().add(p1);
/*Main Class*/
class test2
     public static void main(String args[])
     MyFrame fr =new MyFrame();
     fr.setVisible(true);
}thanx

hi nickelb,
i had returned Object.class in the getColumnClass() method. But then i
got NullPointerException at getRowCount() method. i could understand that the
main problem is in data[][] object. In all the methods its returning null values as it is so declared outside the construtor. But if i declare the object inside the constructor, then the methods could not recognize the object. it seems i cant do the either ways. hope u understood the problem.
thanx

Script to put Datas from Database to TextInput

Hello,
As it is said in the title, I would like to put Datas from Database to Textinput. Here's my application :
Well, what I want to do is when you click on the lines in the Datagrid, the "Nom Area" is completed by the Name in the Datagrid, the "adresse area" by the adress in the Datagrid ...
Can someone help me ? please
Thank you

Here's my code
<code>
<?xml version="1.0" encoding="utf-8"?>
<mx:Application
xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:fourD="http://www.4d.com/2007/mxml" layout="absolute" viewSourceURL="srcview/index.html" backgroundGradientAlphas="[1.0,1.0]" backgroundGradientColors="[#EDE3E3, #555555]" color="#040404" height="899">
<mx:Script>
<![CDATA[
import fourD.sql.*;
import mx.controls.Alert;
import mx.rpc.events.FaultEvent;
import mx.rpc.events.ResultEvent;
[Bindable]
private var _resultSet:SQLResultSet;
// Initialisation de la connection
private function connectHandler(event:Event):void
fourDSQLService.execute("SELECT * FROM clients"); }
private function resultHandler(event:ResultEvent):void
if(event.result != null) { _resultSet = event.result as SQLResultSet; } }
// En cas d'erreur
private function faultHandler(event:FaultEvent):void
var zeError:String= "Error #" + event.fault.faultCode;
// Message d'erreur
Alert.show(event.fault.faultString,zeError); }
]]>
</mx:Script>



<fourD:SQLService id = "fourDSQLService"
host = "127.0.0.1"
userName = "sqlUser"
userPassword="sql"
autoConnect="true"
result = "resultHandler(event)"
fault = "faultHandler(event)"
connect="connectHandler(event)"
/>


<fourD:DataGrid id="contacts_dg"
dataProvider="{_resultSet}" x="10" y="207" width="737" height="397"
/>
<mx:Button x="588" y="627" label="Ajouter" id="btnAjouter"/>
<mx:Button x="666" y="627" label="Supprimer" id="btnSupprimer"/>
<mx:Text x="10" y="10" text="Nom" />
<mx:Text x="10" y="36" text="Secteur d'activitŽ"/>
<mx:Text x="10" y="62" text="Groupe"/>
<mx:Text x="10" y="112" text="Responsable commercial"/>
<mx:Text x="10" y="88" text="Adresse"/>
<mx:Text x="416" y="88" text="Ville"/>
<mx:Text x="595" y="88" text="Code Postal"/>
<mx:Text x="10" y="138" text="Responsable production"/>
<mx:Text x="416" y="112" text="Responsable 3"/>
<mx:Text x="416" y="138" text="Responsable 4"/>
<mx:Text x="624" y="10" text="Code"/>
<mx:RadioButton x="610" y="34" label="Client"/>
<mx:RadioButton x="675" y="34" label="Prospect"/>
<mx:TextInput x="48" y="8" width="568" id="nomArea" />
<mx:TextInput x="117" y="34" width="485"/>
<mx:TextInput x="666" y="8" width="81"/>
<mx:TextInput x="675" y="86" width="72"/>
<mx:TextInput x="63" y="60" width="684"/>
<mx:ComboBox x="157" y="110" width="251"></mx:ComboBox>
<mx:ComboBox x="157" y="140" width="251"></mx:ComboBox>
<mx:ComboBox x="512" y="110" width="235"></mx:ComboBox>
<mx:ComboBox x="512" y="140" width="235"></mx:ComboBox>
<mx:Text x="317.5" y="161" text="Liste Clients" fontSize="19"/>
<mx:TextInput x="63" y="86" width="345"/>
<mx:TextInput x="452" y="86" width="135"/>
</mx:Application>
</code>

Don't show data from web service to Cross-Tab in xcelsius

Hi all visitors
I have created one web service and my web service will show data like this.
Group ___Floor ____Amount
Member__Floor 1__1000000
Member__Floor 2__1000000
Member__Floor 1__1000000
Member__Floor 2__1000000
Member__Floor 2__2200000
Member__Floor 1__     1000000
Member__Floor 1__     1000000
In my xcelsius, i have option to make it to cross-tab.
when i use that data( data above by manual) to excel spreadsheet. The data will change to
Group______________Floor1________________Floor2______________GrandTotal
Member____________5000000_____________ 3200000_____________8200000
GrandTotal__________5000000_____________ 3200000_____________8200000
But when i load the data from web service,It doesn't show anything.
(when i use list view to show data from web server, i see all data)
How can i load data from web service and show the data like manually?
Best Regards,

Hi Tony,
As per your example i have used the SUMIF fucntion
have a glance at that and let me know if you need help
Data coming from webservice >>     Concat     Group     Floor     Amount
                                          =C7&D7     Member     Floor1     1000000
                                          =C8&D8     Member     Floor2     1000000
                                          =C9&D9     Member     Floor1     1000000
                                          =C10&D10     Member     Floor2     1000000
                                           =C11&D11     Member     Floor2     2200000
                                           =C12&D12     Member     Floor1     1000000
                                          =C13&D13     Member     Floor1     1000000
Cross Tab >>Group     Floor1                                                                    Floor2
      Member     =SUMIF($B$7:$B$13,$H$7&I6,$E$7:$E$13)     =SUMIF($B$7:$B$13,$H$7&J6,$E$7:$E$13)
     Grand Total     =SUM(I7)                                                                     =SUM(J7)
Original data after
Group     Floor1     Floor2
Member     4,000,000     4,200,000
Grand Total     4,000,000     4,200,000
Hope this may solve your issue.
Ley me know if you have any other issues.
Regards,
AnjaniKumar C.A.

Problem with displaying the data from Database on swf file.

Hi ,
I am new to flash.Thanks in Advance Please help me....
Actually my requirement is my application consists a button(submit_Btn) when we click on the button(submit_Btn), each time it must to database(through servlet) and brings the data from database and places it on the flash swf file.Here my problem is for the first time when we click on the button it goes to database and place the data(which was returned from database) on the swf file.Next when we click on the button for the second time(or anytime) it is not going and bringing the new data from database(if some data is modified in database or not),Infact it is showing the old data(the data that was collected from previous ClickListener) only on the swf file and it is also not showing any complile time or run time error.
my Code looks like this:
submit_Btn.addEventListener(MouseEvent.CLICK,onCheck2);
function onCheck2(evnt:MouseEvent):void {
var xmlLoader:URLLoader = new URLLoader();
    var xmlurl:String = "http://localhost:8888/xmlServlet";
    var xmlrequest:URLRequest = new URLRequest(xmlurl);
xmlLoader.dataFormat = URLLoaderDataFormat.TEXT;
xmlLoader.addEventListener(Event.COMPLETE, xmlcompleteHandler);
xmlLoader.load(xmlrequest);
function xmlcompleteHandler(event:Event):void {
    var loader:URLLoader = URLLoader(event.target);
    var succData:String=loader.data;
        var xmlData:XML = new XML();
        var xmlList:XMLList;
        xmlData = XML(loader.data);
        xmlList = xmlData.children();
        for (var i=0; i<xmlList.length(); i++) {
            for (var n=0; n<xmlData.UserHumanap[i].HumanapDot.length(); n++) {
                    var x_coordinate:Number = xmlData.UserHumanap[i].HumanapDot[n].@x;
                    var y_coordinate:Number = xmlData.UserHumanap[i].HumanapDot[n].@y;
                    var point2:Point = new Point(x_coordinate,y_coordinate);
                    var circle:Sprite = new Sprite();
                    circle.graphics.beginFill(0x00ff00);
                    circle.graphics.drawCircle(point2.x,point2.y,3);   //Placing the data as dots on the swf file
Thanks in Advance.......Please Help me..........
its Urgent..........
Thanks,
Swarthi

Checkout following line in your code
var xmlurl:String = "http://localhost:8888/xmlServlet";
now change it to
var xmlurl:String = "http://localhost:8888/xmlServlet?random="+String(MAth.random());
I think you will get the point now

Struts, Best proctices to show data from database in view

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