Example of using model 2 architecture
hi,
could someone please direct me to a decend example of using model 2 architecture with jsp and servlets. i'm learning j2ee right now and my book has a simple example with one servlet and 2 jsp pages, are there any examples with more than 1 servlet and 2 jsp pages that are helpful?
Thank you.
check out google.com for source code...
Similar Messages
-
Using model 1 Architecture for inserting row into DB...
The question is on the design of a JSP using Model 1 architecture.
I have a html form with 3 fields taking input from user. I have made a java bean with 3 instance varibales in the name of the field names and with getter() setter() methods too.
I dont want to hardcode the database access in the JSP. How do i acheive modularity or make use of object orientation concepts in the JSP to open aconnection and save the record into a database.
I dont want the conventional way of harcoding like registering DriverManager... Creating Statement opject and OPening Connection...... and with Statement object to call executeUpdate() method...
These all should be encapsulated in class and methods so that my JSP looks simple......
Java Gurus, How do i get going.........Untill now, I have motsly written java web applications merely showing information; there's no insert or update available. nevertheless, the design pattern MVC or Model-View-Controller can work just as good for display-only web apps as for the rest.
You're right if you don't want to have the database connection inside your JSP's. So how do you have to deal with it. The letters MVC already tell a part of the story. You have 3 kinds of objects :
- Model : the so-called Java Beans; these objects refer to the concepts known to the usezr of the web app, like Client, Product, Order, Orderline, Invoice, Payment
- View : these are the JSP's
- Controller : this is the heart of the web app; Java uses the servlets to be the controller.
But there's another kind of object you will need, namely the DAO or Data Access Object. These objects define the contact with the database, contain the SQL-statements and make objects of the Model type.
I'll give 2 examples. The first is the GeneralDao which you define just once. This GeneralDao contains the database driver you're using.
/** Java class "GeneralDao.java" generated from Poseidon for UML.
* Poseidon for UML is developed by Gentleware.
* Generated with velocity template engine.
package org.gertcuppens.dao;
// import java.util.*;
import java.util.ResourceBundle;
import java.sql.*;
/* import org.apache.log4j */
import org.apache.log4j.Logger;
public abstract class GeneralDao {
// operations
* de GeneralDao is de algemene klasse waar alle andere DAO's of Data Access
* Objects van erven. Het is de bedoeling om in deze klasse ��nmaal de
* getConnection te defini�ren
* <p>
* getConnection() connecteert met de databank afhankelijk van de JDBC-driver
* die voorhanden is. Deze methode zorgt ervoor dat alle afgeleide DAO's van
* dezelfde driver gebruik maken terwijl er toch maar op ��n plaats de naam
* van de driver gedefinieerd is.
* </p>
protected Connection getConnection()
throws java.sql.SQLException
Connection dbconn = null;
ResourceBundle resBundle;
Logger mopoLogger = Logger.getLogger("mopo.log");
mopoLogger.debug("start connectie databank " );
try
Class.forName("com.mysql.jdbc.Driver").newInstance();
resBundle = ResourceBundle.getBundle("gcoConfig");
mopoLogger.debug("ophalen resourceBundle (gcoConfig) " );
String dbConnectie = resBundle.getString("databaseconnection");
mopoLogger.debug("lezen databaseconnection in resourceBundle " );
//dbconn = DriverManager.getConnection("jdbc:mysql://localhost/gco");
dbconn = DriverManager.getConnection(dbConnectie);
mopoLogger.debug("maken connectie databank " );
} catch (InstantiationException e)
System.out.println("GeneralDao - Fout bij getConnection - instantiation " );
mopoLogger.fatal("GeneralDao - Fout bij getConnection - instantiation " );
e.printStackTrace();
} catch (IllegalAccessException e)
System.out.println("GeneralDao - Fout bij getConnection - illegal acces " );
mopoLogger.fatal("GeneralDao - Fout bij getConnection - illegal acces " );
e.printStackTrace();
} catch (ClassNotFoundException e)
System.out.println("GeneralDao - Fout bij getConnection - class not found " );
mopoLogger.fatal("GeneralDao - Fout bij getConnection - class not found " );
e.printStackTrace();
return dbconn;
} // end GeneralDao
Each object of the Model type should have a corresponding DAO. In my webapp I had 3 kinds of model objects, so I've defined 3 DAO's. All these DAO's are children of the GeneralDao. I'll give an example of this.
package org.gertcuppens.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.gertcuppens.general.Gebruiker;
/* import org.apache.log4j */
import org.apache.log4j.Logger;
public class GebruikerDao extends GeneralDao {
* Zoekt de gebruiker op aan de hand van de opgegeven naam en wachtwoord
* @return Gebruiker
* @param _naam
* @param _wachtwoord
public Gebruiker findGebruiker(String naam, String wachtwoord)
throws SQLException
Logger mopoLogger = Logger.getLogger("mopo.log");
mopoLogger.debug("start findGebruiker" );
StringBuffer zoekString = new StringBuffer();
zoekString.append ("select * from gebruiker ");
zoekString.append("where naam=? and wachtwoord=? ");
Connection con = getConnection();
PreparedStatement ps = con.prepareStatement(zoekString.toString());
ps.setString(1,_naam);
ps.setString(2,_wachtwoord);
ResultSet rs = ps.executeQuery();
if (rs.next() )
Gebruiker gebruiker = new Gebruiker(rs);
rs.close();
ps.close();
con.close();
mopoLogger.debug("gebruiker gevonden " + gebruiker.getNaam());
return gebruiker;
else {
ps.close();
con.close();
mopoLogger.debug("geen gebruiker gevonden");
return null;
} // end findGebruiker
} // end GebruikerDao
Want to know more about this ? Just give me a sign. -
Advice on Security Model Architecture..
Hi all,
Just looking for the advice of the experts :)
I am working on the security model architecture for multi-tiered java application. The application architecture breaks down roughly as follows:
Presentation Layer (JSP/Java)
Business Layer (Java)
Persistence Layer (JDBC/Oracle DB)
Now, in the DB we will preserve information about various users, as well as the user's application permissions. My question pertains to authentication/authorization. Where is it most appropriate or efficient to verify a user's access to a functionality? Assume that the user and permission information is retrieved upon login and is made available to all levels.
The options, as I see them, include the following:
Presention layer - UI exposes only functionality applicable to the user.
Business layer - Encode the logic in this facade for the backend.
Persistence layer - Encode the logic in the data access objects.
Any thoughts?Well, the layered approach is one way in which java applications are constructed.. the user interface is the top layer, which is composed of jsp files and other java files, and the objects that talk to the database are the bottom layer. Maybe an example would help..
You're looking at a page on the Java Discussion Forums. It's a jsp page. You click on the 'Watches' link (upper right). The link points to a servlet, which calls a method in an object that is in what I call the "business" or middle layer/tier. An object in this layer has methods that correspond to any request that needs to be made of the db.
This method in turn calls method/methods in the backend, or data layer, which queries the database and returns the watches for this particular user...
So, if you have a request/response transaction (click on a link or button, processing, and new page is loaded), it would make a round trip through the layers:
Presentation -> Business -> Data -> DB -> Data -> Business -> Presentation -
Simple jsp example of using BI Bean in Myeclipse
hi
anyone can show me a simple jsp example of using BI Bean in Myeclipse
or how to import BI Bean into Myeclipse
I would so thankful for who can answer me.. please its urgent
thanksSorry, I was not very clear in my last message.
I need all my webservices to share the same bean during one user session.
Then, if a page calls 2 different web services, only 1 database connection is made instead of 2. And if the user opens other pages which call other webservices, they will use the connection kept into the session bean.
Anyway, I tried to do like it is said in your website but I can not build my project. I have an error : java.lang.LinkageError: JAXB 2.0 API is being loaded from the bootstrap classloader, but this RI (from jar:file:/C:/.../build/web/WEB-INF/lib/jaxb-impl.jar!/com/sun/xml/bind/v2/model/impl/ModelBuilder.class) needs 2.1 API. Use the endorsed directory mechanism to place jaxb-api.jar in the bootstrap classloader. I do not understand because I have downloaded the jax-ws 2.1.1 api and no other libraries are imported in my project. :-(
I wonder if it is not related to netbeans... -
Please let me know a good example of Data Modeling Xml files...
Business process, ERD and so on...
Anything is OK. I want to get a good example of Data Modeling XML files.
I want to see what you did and how to use it more efficiently.
Thanks in advance.
Edited by: allbory on May 17, 2009 11:05 PMHello,
there are several samples at data modeler page http://www.oracle.com/technology/products/database/sql_developer/files/Modeling.html
Philip -
Drop Downl list box using model binding
Hi friends
I observed one thing that for drop down list box if we set the attribte 'helpValues' using Model Data Binding. Then the list is showing if the search help assigned to field or data element contains only 2 fields.
For example in SFLIGHT table drop down list box shows for 'CARRID' Field not for 'CONNID' .
The same problem for get_simple_helpvalues2() method also.
Is it right ? or Wrong?That is a limitation of those methods that I have observed as well.
Recently I picked through the code of get_simple_helpvalues2. I am currently using in my Value Help Custom Extension (along with the BAPI for HELP_VALUES). I wanted something simpler to use than the BAPI, but with more functionality than get_simple_helpvalues2. I used some of the code from get_simple_helpvalues2 and extended it to support any elementary search help (it works for both CARRID and CONNID).
I used calls to DD_SHLP_GET_HELPMETHOD and DD_SHLP_GET_HELPVALUES. The end result is quite a bit of code, but once completed very easy to reuse. I hope to update the example I have on SDN for Value Help with this additional solution, but I have been quite busy trying to get ready for TechED. Also I have a few bugs left to work out in my method. -
About dynamic aggregation and using model
I want to use model to realize dynamic aggregation.
for example, I have a dimension named "product",it contains some values like :
"apple" "orange" "beer" "beef" "bullfrog" "coffee"....
I also have a "wastage" measure base on this dimension.
I sometimes wanna see fruit wastage(fruit=apple+orange),sometimes breakfast food wastage(breakfast=apple+beef+coffee),sometimes other aggregation.
how can I solve this problem? thanks for any suggestion.There are two answers depending on the scoping that
you want the members to have. Both cases use the
same model:
DFN Foodmod MODEL
MODEL
DIMENSION product
FRUIT = AGGREGATION('APPLE' 'ORANGE')
BREAKFAST = AGGREGATION('APPLE' 'BEEF' 'COFFEE')
END
If you want the dynamic calculations to be persistent
across sessions then you should make the model part
of the definition of the aggmap.
DFN Foodmap AGGMAP
AGGMAP
Relation Food.Food
Model Foodmod PRECOMPUTE(na)
END
If you just want the positions to last for the session
you can dynamically add a model to a pre-existing
aggmap.
DFN Foodmap AGGMAP
AGGMAP
Relation Food.Food
END
CONSIDER Foodmap
AGGMAP ADD Foodmod -
Avoiding null and duplicate values using model clause
Hi,
I am trying to use model clause to get comma seperated list of data : following is the scenario:
testuser>select * from test1;
ID VALUE
1 Value1
2 Value2
3 Value3
4 Value4
5 Value4
6
7 value5
8
8 rows selected.
the query I have is:
testuser>with src as (
2 select distinct id,value
3 from test1
4 ),
5 t as (
6 select distinct substr(value,2) value
7 from src
8 model
9 ignore nav
10 dimension by (id)
11 measures (cast(value as varchar2(100)) value)
12 rules
13 (
14 value[any] order by id =
15 value[cv()-1] || ',' || value[cv()]
16 )
17 )
18 select max(value) oneline
19 from t;
ONELINE
Value1,Value2,Value3,Value4,Value4,,value5,
what I find is that this query has duplicate value and null (',,') coming in as data has null and duplicate value. Is there a way i can avoid the null and the duplicate values in the query output?
thanks,
Edited by: orausern on Feb 19, 2010 5:05 AMHi,
Try this code.
with
t as ( select substr(value,2)value,ind
from test1
model
ignore nav
dimension by (id)
measures (cast(value as varchar2(100)) value, 0 ind)
rules
( ind[any]= instr(value[cv()-1],value[cv()]),
value[any] order by id = value[cv()-1] || CASE WHEN value[cv()] IS NOT NULL
and ind[cv()]=0 THEN ',' || value[cv()] END
select max(value) oneline
from t;
SQL> select * from test1;
ID VALUE
1 Value1
2 Value2
3 Value3
4 Value4
5 Value4
6
7 value5
8
8 ligne(s) sélectionnée(s).
SQL> with
2 t as ( select substr(value,2)value,ind
3 from test1
4 model
5 ignore nav
6 dimension by (id)
7 measures (cast(value as varchar2(100)) value, 0 ind)
8 rules
9 ( ind[any]= instr(value[cv()-1],value[cv()]),
10 value[any] order by id = value[cv()-1] || CASE WHEN value[cv()] IS NOT NULL
11 and ind[cv()]=0 THEN ',' || value[cv()] END
12 )
13 )
14 select max(value) oneline
15 from t;
ONELINE
Value1,Value2,Value3,Value4,value5
SQL> -
Unable to display data no entry in the table without using Model clause
Hi,
I've an urgent requirement described below :
The previously posted Question has been answerted using Model Clause:
Is there any way out to solve it without using Model clause:
I've a table named as "sale" consisting of three columns : empno, sale_amt and sale_date.
(Please ref. The table script with data as given below)
Now if I execute the query :
"select trunc(sale_date) sale_date, sum(sale_amt) total_sale from sale group by trunc(sale_date) order by 1"
then it displays the data for the dates of which there is an entry in that table. But it does not display data for the
date of which there is no entry in that table.
If you run the Table script with data in your schema, then u'll see that there is no entry for 28th. Nov. 2009 in
sale table. Now the above query displays data for rest of the dates as its are in sale table except for 28th. Nov. 2009.
But I need its presence in the query output with a value of "sale_date" as "28th. Nov. 2009" and that of "total_sale" as
"0".
Is there any means to get the result as I require?
Please help ASAP.
Thanks in advance.
Create table script with data:
CREATE TABLE SALE
EMPNO NUMBER,
SALE_AMT NUMBER,
SALE_DATE DATE
SET DEFINE OFF;
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(100, 1000, TO_DATE('12/01/2009 10:20:10', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(100, 1000, TO_DATE('11/30/2009 10:21:04', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(100, 1000, TO_DATE('11/29/2009 10:21:05', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(100, 1000, TO_DATE('11/26/2009 10:21:06', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(100, 1000, TO_DATE('11/25/2009 10:21:07', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(200, 5000, TO_DATE('11/27/2009 10:23:06', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(200, 4000, TO_DATE('11/29/2009 10:23:08', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(200, 3000, TO_DATE('11/24/2009 10:23:09', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(200, 2000, TO_DATE('11/30/2009 10:23:10', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(300, 7000, TO_DATE('11/24/2009 10:24:19', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(300, 5000, TO_DATE('11/25/2009 10:24:20', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(300, 3000, TO_DATE('11/27/2009 10:24:21', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(300, 2000, TO_DATE('11/29/2009 10:24:22', 'MM/DD/YYYY HH24:MI:SS'));
Insert into SALE
(EMPNO, SALE_AMT, SALE_DATE)
Values
(300, 1000, TO_DATE('11/30/2009 10:24:22', 'MM/DD/YYYY HH24:MI:SS'));
COMMIT;
Any help will be needful for me
Regards,select sale_date,sum(sale_amt) total_sale
from
select empno,0 sale_amt,(sale_date + ao.rn) sale_date
from
select empno,sale_amt,sale_date ,(t.nxt_dt - t.sale_date) diff
from
select empno
,sale_amt,trunc(sale_date) sale_date
,trunc(nvl(lead(sale_date) over (partition by 1 order by sale_date),sale_date)) nxt_dt
from sale
) t
where (t.nxt_dt - t.sale_date) >1
) rec,(select rownum rn from user_objects where rownum<=200) ao
where ao.rn <=(rec.diff-1)
union all
select empno,sale_amt,trunc(sale_date) sale_date
from sale
group by sale_date
order by 1;
~~~~Guess this will serve the purpose...
Cheers Arpan -
Is there an example to use interface to replace if then else pattern in F#
is there an example to use interface to replace if then else pattern in F#
i want to make match pattern with only one rule to represent dynamic number of rules which is use
let rec fun1 m number fun2param =
match m with
| fun2param(a,b,number) -> ****rewrite terms ****
let fun2param number =
if number = 1 then
function.....
elif number = 2 then
function ....
computing nightmareIn general, you use a match
let fun2param number =
match number with
| 1 -> function.....
| 2 -> function ....
in the same way as you would use a `switch` construct in 'C' in place of a repeated if/elif...elif/else
Your request is somewhat vague, so I'm not sure whether you would benefit from wrapping that behind an active pattern. -
Example for Using WDR_SELECT_OPTIONS and SALV_WD_TABLE in one View
Hello,
I need an Example for Using the WD-Components WDR_SELECT_OPTIONS and SALV_WD_TABLE
in one view. Can anybody help me?
Thanks
TotoHello,
Please see these:
[https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/3439404a-0801-0010-dda5-8c14514d690d]
[https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/21706b4b-0901-0010-7d93-c93b6394bc1d]
[https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/media/uuid/39c54fe7-0b01-0010-0eb6-d63ac2bdd637]
[/people/rich.heilman2/blog/2005/12/20/using-select-options-in-a-web-dynproabap-application]
[/people/thomas.jung3/blog/2005/12/21/webdynpro-abap-alv]
[https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/3133474a-0801-0010-d692-81827814a5a1]
[https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/bd28494a-0801-0010-45a3-fc359d82d3e8]
Regards. -
how come when i make a web site and i test it in my local server it works fine when i tranfer to server certain things do not work example i used javascript to put in a prompt bar for a newsletter page at the server it did not work but at local it did also it works at MOZZILLA but not internet explorer i also have cs4 was wondering if there is a way to test a page in dreamweaver and then transfer THANK YOU X-FACTOR-MEDIA
In future, please try to make the subject line of your posts shorter. In this case the following would have been sufficient: "JavaScript works locally, but not on remote server".
Short, but meaningful subject lines make it easier for others to identify what your question is about, and often bring faster help. -
How can I download itunes when I get the following errors ..ituneshelper did not install correctly error 7..I .have installed and uninstalled a dozen times with various fixes...b noir for example and used Revo to clean up.
This has been a problem for 6 weeks now, I retry when I have time and patience and use my other laptop which is also Windows 7 and runs with no problem.
Every attempt fails when all seems fine on the desktop and I try to log on to Itunes I get the errors.
Any help greatly appreciated.
billymacGo to Control Panel > Add or Remove Programs (Win XP) or Programs and Features(Later)
Remove all of these items in the following order:
iTunes
Apple Software Update
Apple Mobile Device Support (If this won't uninstall press on)
Bonjour
Apple Application Support
Reboot, download iTunes, then reinstall, either using an account with administrative rights, or right-clicking the downloaded installer and selecting Run as Administrator.
See also HT1925: Removing and Reinstalling iTunes for Windows XP or HT1923: Removing and reinstalling iTunes for Windows Vista, Windows 7, or Windows 8
Should you get the error iTunes.exe - Entry Point Not Found after the above reinstall then copy QTMovieWin.dll from:
C:\Program Files (x86)\Common Files\Apple\Apple Application Support
and paste into:
C:\Program Files (x86)\iTunes
The above paths would be for a 64-bit machine. Hopefully the same fix with the " (x86)" omitted would work on 32-bit systems with the same error.
tt2 -
Link with examples of using dbms_stats package
Please,
Should Someone let me know when I could find a link or some example on using the new DBMS_STATS package to gather data statisitcs?
ThanksAll, made in Oracle:
http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14231/general.htm#sthref1861
http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14211/stats.htm#PFGRF30102
http://download-west.oracle.com/docs/cd/B19306_01/appdev.102/b14258/d_stats.htm#sthref7887
http://download-west.oracle.com/docs/cd/B19306_01/appdev.102/b14258/d_stats.htm#sthref7903
http://download-west.oracle.com/docs/cd/B19306_01/appdev.102/b14258/d_stats.htm#ARPLS059 -
Can please forward me web dynpro DC scenarious in NWDS 7.0 using model?
Hi,
Experts,
Please pass some web dynpro development component simple scenarios in NWDS 7.0.18 using model part (like getting data from sap and displaying it) as i am new to this technology.
Thanks in advance,
Shabeer ahmedHi,
Please refer to these links..
[https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/b083f76a-708c-2b10-559b-e07c36dc5440]
[https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/a137c339-0b01-0010-a688-a87b88706845]
Hope it helps...
Jithin.
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