Adobe Flex + PHP (Using Data Transfer Object pattern in amf)

hello
i'am using amf to connect my flex application to the php back end,but i want to use DTO(DataTransferObject), i haven't enough info about this pattern.
can you introduce me a reference or have you any suggestion?
thanks for your attention
Uniqe_max (amin shahnazary)

here is another way of doing it
http://www.youtube.com/watch?v=1n1uHQAP18Q
http://www.youtube.com/watch?v=fQsCBk9tvkQ

Similar Messages

Best Practice Using Data Access Object Pattern

I was wondering what would be the best approach with regards to implementing the Data Access Object pattern:
Given the following database tables:
teacher {teacher_id, teacher_name, ...}
subject {subject_id, subject_name, ...}
teacher_subject {teacher_id, subject_id}where teacher and subject hold details on teachers and subjects respectively and teacher_subject links teachers with the subjects that they currently teach, would I be better off:
1) implementing three distinct DAO classes i.e. TeacherDAO, SubjectDAO, TeacherSubjectDAO, that correspond to each database table;
2) implementing a single DAO class that controls access to all three tables, given that business operations often rely on access to all three tables e.g. getSubjectTeachers(Subject s), assignSubjectToTeacher(Subject s, Teacher t), getSubjectsTaughtBy(Teacher t)...
Thanks
Ian

...would I be better off:Depends on the system.
If you are always going to have a teacher with subjects then all you need is one class.
If on the other hand sometimes you are going to have subjects with teachers (given that you have a link table a many to many relationship exists) then two DAOs would exist.
It would be unlikely for you to have a DAO for the link table unless perhaps you are anticipating a teacher having tens of thousands of subjects or one subject having tens of thousands of teachers.

Transfer Object Pattern and Concurrency Transaction Mgmt

I am developing an application that implements a remote rich client. For
performance reasons I have chosen to use the Transfer Object pattern. I
have been very successful with this from a performance standpoint, it
really paid off. I am using it in combination with an assembler pattern
to construct Transfer Objects for the view and to also reassemble domain
objects based on changes made to transfer objects on my client side.
Anyways the only problem I am having with it is I can't seem to figure
out how I should implement optimistic locking with it. Is there a best
practices to handle transaction control here?
I generally try to keep visibility of stale data down, but there are still
situations where concurrent clients could have requested to edit the same
the Transfer Object at the same time. I would ideally like to handle this
using a flavor of optimistic locking. I in fact have implemented
optimistic locking on the domain side, but now I am not sure how or if I
should integrate this into the Transfer Object or View side. The version
field used in optimistic locking is generally a hidden field. The only
way I can see to handle this with the view side is to expose this field on
the Domain Objects and actually store it into assembeled transfer objects.
This seems like it may be a bad idea from a design standpoint.
The problem is the client requests data and it assembled and delivered to the client. Then at some later time the client may send a request to the server to update this data. At this time a new transaction must be started where the server reloads the domain data and copies over the requested changes. Since the domain data was just loaded you wouldn't ever trigger a versioning problem unless the version was maintained on the transfer object and copied over as well. I am developing this project with hibernate on the back end and unfortunately hibernate doesn't acknowledge manual changes to the version field.
I just feel like there must be a better way to do this. I believe that using the Transfer Object or DTO pattern for remote client/server architectures is pretty common. So there must be a best practice to deal with concurrency? Suggestions, insight, lay it on me please.
thx

I personal respect both concepts and am using both in an application I am currently work.
Firstly, I have my Transfer Object which I call xxxData.
Next, the entities are called xxx
I have my DAO classes that handles all CRUD operation. but within the DAO class I have two methods
private <EntityClass> retrieveEntityFromObject(<EntityClassData> data) {}
private <EntityClassData> retrieveEntityFromObject(<EntityClass> entity) {}so with these methods, I separate my business logic from my data layer. My codes will alway use data objects instead of entities. For example, a create method will be
public ProductData createProduct(ProductData data)
entity.persist(retrieveEntityFromObject(data));
}I hope someone understands
Regards

Data Transfer Object Class

HI, i'm new with the web dynpro, so i been told to use java web dynpro using the Data Transfer Object, with a conection to Oracle.
anybody has information about the web dynpro using Data Transfer Object.
thanks in advance!!

Hi,
Their are lot of articles on the same here, please search for java bean models. Will give some hints
I guess what you are planning to do is
DB--> EJB/POJO--
> Webdynpro
Regards
Ayyapparaj

Hierarchical data transfer objects confusing Flex compiler...

I just posted this same query on FlexCoders... but then I
thought this might be a better target group to ask, so here goes:
We are working on a set of data transfer objects where we
have matching server-side java classes and client-side AS classes.
Some of these DTO contain lists of other DTOs. As an example:
A.java:
public class A {
List<B> blist
In A.as we have...
class A {
public var blist : ArrayCollection;
And we have B.java and B.as
Then we have a RemoteObject call to pull down a bunch of A
objects....
Here's the problem, Flex does not compile B.as at build-time.
So if B.as has a compiler problem, you never know about it,
except that the 'blist' in A never gets populated. If you break
down the data transfer and debug it. You find that during
RemoteObject call, the blist data comes "down the wire", but as an
ArrayCollection generic Objects, they never get turned into
instances of Bs...
I am guessing that this is happening because at compile time,
there is not direct reference to B in the clientside project. Our
covering .mxml wants one or more A objects, and inside A the blist
is an ArrayCollection. So the compiler doesn't see a reference to
B..
So anyone know how we can fairly seamlessly make sure B.as
gets compiled at build time so we'd know of compiler issues with it
rather than spending lots of time debugging mysterious null values?
(This appears to happen whether the project is set to compile
on the client-side or the server-side. We are using Flex and FDS
2.0.1 and Java 1.5)

up...

Transfer Object pattern question

Hi, developers!
I created a Transfer Object pattern class, that has an array field. See below:
class TOClass {
private int[] values;
//notice that I am using clone() method
public int[] getValues() {
return (int[])values.clone();
public void setValues(int[] values) {
this.values = (int[])values.clone();
}Would you do like I did?
Thanks in advance!

Thank you, you all!
I am testing the solution you presented, Saish, and I am verifying yet. But I see that the problem of manipulation of data continues, like dubway said. But, this discussion gave me a lot of ideas! (I didn�t know Collections.unmodifiableList() method yet, very interesting method). I will continue my researchs for the best solution.
But I have to worry only when the getter method is used, because I don�t know what other developers will do with the value returned. I don�t need to worry about setter, because the only person that sets is me, and nobody else.
And one more thing. My TO class does not contain only one field. There are other fields: Strings, BigDecimals, etc, but these other fields are easy, I just have to create getters and setters for them. There is only one field that has the "behaviour of an array". But because of the fact that there are other fields, to not make this class complicated and "dirty" visually, I really want to use simple getters and setters methods, only. Your solution is not providing getters and setters exactly, Saish. I want to follow the Transfer Object pattern, whose feature is the existence of getters and setters, only.

Business Objects(BOs) & Data Transfer Objects(DTOs)-both needed ?

In a J2EE system...
I know that "Business Objects" (BOs) are basically value objects (VOs) ...lots of getters and setters and some business logic. These are basically to model nouns in the system. Eg Student BO.
I know that "Data Transfer Objects" (DTOs) are value objects (VOs)....with getters and setters... with the purpose of avoiding multiple method calls...to avoid overhead...which effects performance. eg it's better to pass a Student DTO then say...pass the student ID and student name and student age etc etc.
Main question : Should a system have both ? If yes, why do I need a StudentBO.java and then another StudentDTO.java....when they are so similar ?...when both are basically VOs ? Can't I just use BOs to serve as DTOs ?
Thanks.

Hi,
I've started using BO's and DTO's since 3 months .With my experiece i understand we nned both of them.
The BusinessObject represents the data client. It is the object that requires access to the data source to obtain and store data.
DTO
This represents a Transfer Object used as a data carrier. The DataAccessObject may use a Transfer Object to return data to the client. The DataAccessObject may also receive the data from the client in a Transfer Object to update the data in the data source.
From this i want to tell you that We are not gonna do any operation on BO's but we do operations on DTO
Ashwin

Simple Question - Data Transfer Object

Hey gurus,
I like the option in JBuilder to automatically create Data Transfer Objects and an Assembler for it. But what? I used to make the assembler a Session Bean, and JBuilder makes it a normal Java class with static methods. I know JBuilder always ships with the best solutions, but...
what is the advantage of the static class here? And in my case, i have the session beans and the entity beans deployed on a different server, would that make a difference for the advantage?
greets,
Nick.

Hey gurus,
I like the option in JBuilder to automatically create
Data Transfer Objects and an Assembler for it. But
what? I used to make the assembler a Session Bean,
and JBuilder makes it a normal Java class with static
methods. I know JBuilder always ships with the best
solutions, but...
well....... not always
:-)

Data Transfer Objects

Is it safe to assume that Data Transfer Objects should be populated by Business Objects that are local to entity beans or whatever is being used to populate them?

jschell wrote:
ttb999 wrote:
jschell wrote:
So if the point of DTOs is to reduce network traffic, why would you initially populate them using a remote object? That doesn't have anything to do with what I said.Well that was the jist of my question.Your statement has a historical perspective which probably doesn't mean much in current DTO usage.
Originally RMI was promoted as a a 'method' interface. As such you would have had the equivalent of a DTO with setter/getter for each attribute. Each setter/getter would invoke a remote procedure call to the server.
Thus a data object with 5 attributes would cause 5 network calls to 'populate' the attributes.
That was vastly inefficient.
Consequently the first DTO type (which was not called a DTO) was promoted as a way to avoid that.
If you want you can look up "Remote Procedure Call" (RPC) which would have been the origin of where the 'method' idiom originated.And quite apart from performance, populating a local object from the remote prevents disruption of the local data in case the network connection is (temporarilly) lost.

Importing incoming payments using data transfer workbench

Hi experts
I am using data transfer workbench for incoming payments, but incoming receivables are checks.
I am using three templete files
1.Payments
Recordkey Cardcode Docdate
1                 A0001      21102009
2.Payments_check
Recordkey Lineno Checkaccount Checknumber Checksum Duedate
1                       0               161016                1234                11500        21102009
3.Payment Invoice
Recordkey Lineno Docentry SumApplied
1                     0               616000012      11500
In the field docentry i am placing the invoice number ,i did tried placing the payment number as well in both the cases i am getting the same error. Invalid document number for rct2.docentry Application defined or object defined error 65171
What should i do to resolve this error.
Thanks and regards
Rohan

Hi Rohan,
Document number is usually not the same as your DocEntry. Run a simple query to find it out:
SELECT T0.DocEntry FROM OINV T0 WHERE T0.DOcNum = '[%0\]'
Also the Date format should be YYYYMMDD.
Thanks,
Gordon

Round values using data transfer workbench

Hi,
I'm using data transfer workbench to migrate some data, and some values are being rounded wich generates errors in the system.
Can sombedoy please help me with this issue? i'm using sap business one 2005 patch 18.
Thanks a lot

Angie did you created the template using EXCEL?
When you edit templates with MS EXCEL you must make sure that the cell properties are properly configure, because if the cell is configure as a number with no decimal it will round the number, the same goes when the cell is a string, if a cell has a comma it will include double quotes when it saves the excel file.
Regards,
WB

Data access object pattern

Hello,
I am trying to implement the Data Access Object pattern and I have the following bean:
package com.netpepper.ecards;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.faces.application.Action;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
* @author Julien Martin
* Card class: represents the card sent from a member of the public (the sender)
* to another member of the public (the recipient).
public class Card {
     private static Log log = LogFactory.getLog(Card.class);
     private long id;
     private String from_email;
     private String to_email;
     private String image;
     private String bgcolor;
     private String font;
     private String from_name;
     private String to_name;
     private String message;
     private String title;
     private boolean received;
     private boolean sent;
     private String send_date;
     private String response;
      * Public empty no-arg constructor
     public Card() {}
      * Full-fledged constructor
     public Card(
          long id,
          String from_email,
          String to_email,
          String image,
          String bgcolor,
          String font,
          String from_name,
          String to_name,
          String message,
          String title,
          boolean received,
          boolean sent,
          String send_date) {
          setId(id);
          setFrom_email(from_email);
          setTo_email(to_email);
          setImage(image);
          setBgcolor(bgcolor);
          setFont(font);
          setFrom_name(from_name);
          setTo_name(to_name);
          setMessage(message);
          setTitle(title);
          setReceived(received);
          setSent(sent);
          setSend_date(send_date);
      * @return the background color choosed by the sender.
     public String getBgcolor() {
          return bgcolor;
      * @return the font choosed by the sender.
     public String getFont() {
          return font;
      * @return the sender's email.
     public String getFrom_email() {
          return from_email;
      * @return the sender's name.
     public String getFrom_name() {
          return from_name;
      * @return the card's id.
     public long getId() {
          return id;
      * @return the image choosed by the sender.
     public String getImage() {
          return image;
      * @return the message input by the sender.
     public String getMessage() {
          return message;
      * @return <code>true</code> if the card has been received, <code>false</code> otherwise.
     public boolean isReceived() {
          return received;
      * @return <code>true</code> if the card has been sent, <code>false</code> otherwise.
     public boolean isSent() {
          return sent;
      * @return the title choosed by the sender.
     public String getTitle() {
          return title;
      * @return the recipient's email.
     public String getTo_email() {
          return to_email;
      * @return the recipient's name.
     public String getTo_name() {
          return to_name;
      * @param the background color choosed by the sender.
     public void setBgcolor(String string) {
          bgcolor = string;
      * @param the font choosed by the sender.
     public void setFont(String string) {
          font = string;
      * @param the sender's email.
     public void setFrom_email(String string) {
          from_email = string;
      * @param the sender's name.
     public void setFrom_name(String string) {
          from_name = string;
      * @param the card's id.
     public void setId(long i) {
          id = i;
      * @param the image choosed by the sender.
     public void setImage(String string) {
          image = string;
      * @param the message input by the sender.
     public void setMessage(String string) {
          message = string;
      * @param <code>true</code> if the card has been received, <code>false</code> otherwise.
      * If the application attempts to set the received field to true,
      * then the received field of the Card object is persisted to database
      * and an email is sent to the sender to notify them that the card has been received.
     public void setReceived(boolean b) {
          if (this.received == false && b == true) {
               Mailer m = new Mailer();
               try {
                    m.sendAcknowlegement(
                         to_email,
                         from_email,
                         from_name,
                         to_name,
                         id);
                    Connection con = DBConnection.getConnection();
                    PreparedStatement ps =
                         con.prepareStatement(Queries.setReceivedQuery);
                    ps.setLong(1, this.id);
                    ps.executeUpdate();
                    con.close();
                    this.received = true;
               } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
      * @param <code>true</code> if the card has been sent, <code>false</code> otherwise.
      * If the application attempts to set the send field to true,
      * then the sent field of the Card object is persisted to database.
     public void setSent(boolean b) {
          if (this.sent == false && b == true) {
               try {
                    Connection con = DBConnection.getConnection();
                    PreparedStatement ps =
                         con.prepareStatement(Queries.setSentQuery);
                    ps.setLong(1, this.id);
                    ps.executeUpdate();
                    con.close();
               } catch (SQLException e) {
                    log.error("ERROR: impossible to update the sent field");
                    e.printStackTrace();
      * @param the title choosed by the sender.
     public void setTitle(String string) {
          title = string;
      * @param the recipient's email.
     public void setTo_email(String string) {
          to_email = string;
      * @param the recipient's name.
     public void setTo_name(String string) {
          to_name = string;
      * @return the send date.
     public String getSend_date() {
          return send_date;
      * @param the send date.
     public void setSend_date(String string) {
          send_date = string;
      * @return <code>true</code> if email has been sent, <code>false</code> otherwise.
     public boolean sendEmail() {
          try {
               Mailer sm = new Mailer();
               sm.sendCard(
                    this.from_email,
                    this.to_email,
                    this.from_name,
                    this.to_name,
                    this.id);
               return true;
          } catch (Exception e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
               return false;
      * Retrieve the card from the database
     public static Card getCardFromId(int id) {
          Card c = new Card();
          c.id = id;
          try {
               Connection con = DBConnection.getConnection();
               PreparedStatement ps = con.prepareStatement(Queries.getCardFromID);
               ps.setInt(1, id);
               ResultSet rs = ps.executeQuery();
               if (rs.next()) {
                    c.setBgcolor(rs.getString("db_bgcolor"));
                    c.setFont(rs.getString("db_font"));
                    c.setFrom_email(rs.getString("db_from_email"));
                    c.setTo_email(rs.getString("db_to_email"));
                    c.setFrom_name(rs.getString("db_from_name"));
                    c.setTo_name(rs.getString("db_to_name"));
                    c.setFont(rs.getString("db_font"));
                    c.setMessage((String) rs.getObject("db_message"));
                    c.setTitle(rs.getString("db_title"));
                    c.setSend_date(rs.getString("db_send_date"));
                    c.setImage(rs.getString("db_image"));
                    if (rs.getString("db_received").equals("y")) {
                         c.received = true;
                    } else if (rs.getString("db_received").equals("n")) {
                         c.setReceived(true);
                    if (rs.getString("db_sent").equals("y")) {
                         c.setSent(true);
                    } else if (rs.getString("db_sent").equals("n")) {
                         c.setSent(false);
               System.out.println(c);
               //con.close();
               return c;
          } catch (SQLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
               return null;
     public String toString() {
          return ("Title: " + this.title + ", " + "Id: " + this.id);
      * @param string
     public void setResponse(String string) {
          response = string;
     protected String saveCard() {
          try {
               Connection con = DBConnection.getConnection();
               PreparedStatement ps = con.prepareStatement(Queries.saveCard);
               ps.setLong(1, (new java.util.Date()).getTime());
               ps.setString(2, this.from_email);
               ps.setString(3, this.to_email);
               ps.setString(4, this.image);
               ps.setString(5, this.bgcolor);
               ps.setString(6, this.font);
               ps.setString(7, this.from_name);
               ps.setString(8, this.to_name);
               ps.setString(9, this.message);
               ps.setString(10, this.title);
               ps.setString(11, this.send_date);
               ps.executeUpdate();
               con.close();
               return "saved";
          } catch (SQLException e) {
               log.error("ERROR: impossible to save the card");
               e.printStackTrace();
               return "notSaved";
     public Action getSaveCard() {
          return new Action() {
               public String invoke() {
                    return saveCard();
}The full source code for the project can be downloaded here:
http://cours.java.free.fr/ecards-project/
I would like to decouple the bean from the jdbc but I don't know how to. Can anyone help please?
I found some sampes here http://access1.sun.com/codesamples/DataAccessObject.html
but it does not have any update jdbc.
Julien.

Your DAO should have methods for getting and setting beans.
For example:
public Card getCard(long id){...}
public void updateCard(Card c) {...}

Can I declare arraylists in data transfer object

Can I use arraylists in data transfer objects

Yes, and don't double post:
http://forum.java.sun.com/thread.jsp?thread=540027&forum=425&message=2616354
Answers don't always come in three minutes. Be patient.

Installing Plug In for Adobe Flex and Using it in developing Application

Hi all,
I'm using NWDS CE 7.1 EhP1. I want to develop application using Adobe Flex for Web Dynpro for Java.
I have downloaded and installed plug named :- ActionScript WSDL Proxy Generator Plug-in 1.0.32
But I am not able to see any change in my NWDS.
I dont know whether what I did is correct or not ! Can anybody pls explain me how to start developing UI in Adobe Flex for WDJ?
I saw one wonderful blog Step by Step Guide for creating Flash islands using Webdynpro Java by Ayyapparaj KV.
Pls help.
Thanks and regards,
Amey Mogare

Hi Fazal,
Thank u for this valuable and timely response !
This is the exact PDF I'm following to install plug-in:-
https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/20536f87-b5a1-2a10-06ad-c15369468e0e
I am stuck at step 1.3 (page-4). I am able to see ActionScript proxy generator plug-in in my NWDS's plug-in list. But I am not able to get line :-
locate the ActionScript WSDL Proxy
Generator Plug-in there (plug-in id: com.sap.flex.ws.proxygen.ASProxyGeneratorPlugin).
I am not able to generate anything there.. Also I went ahead with Step-2 and I am able to see project "Runtime" in my Resource perspective.. What is to be done next?
Thanks and regards,
Amey Mogare
Edited by: Amey Mogare on Apr 20, 2009 6:40 AM

Data Transfer Objects Design Pattern

Hi All,
Could anyone tell me more about this DTO design pattern, as such when one should prefer it.
Second is this pattern transaction safe or one would have to implement the same manually. Any updates would prove benefecial to me.

Hi
I do not understand what you mean.
A dto is just an object which you populate in one layer and use in another layer.
you do not need any jndi look for DTO , instead you lookup for ejbs , datasources ,....
for example you lookup for some CMP , search and find some CMPs , populate DTO with those CMP and send the DTO to front layer.
if it is not the answer , can you explain more about your requirements(S)

Adobe Flex + PHP (Using Data Transfer Object pattern in amf)

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