What is Value object?
Hi there,
What is Value object in EJB?
TQ
Neo
The main idea of a value object is to group information into chunks to minimize the chattiness of a distributed system.
For example if you had a EJB that represented a user you might have methods called getFirstName, getLastName, getPhone, etc. Each time you call one of those methods from a remote context, you have to make a separate remote call. Each remote call involves a bunch or IP and ethernat headers that you never see but must be transfered across the network. So if you are getting two bytes of data you are really sending several hundreds or thousands of bytes of data. It's inefficient. If you were using value objects you would create a call called UserValueObject that would contain all the info about that user. Then you would have a method called getUser on your bean that would fill up the value object and return it. Then you have all the data you need about the user without making umpteen remote calls. The same thing goes for updates.
Similar Messages
-
Passing "Value Objects" from one JSP to next (2)
Someone posted a response from BEA which has since disappeared, it was no different
from what I was doing and it I still can't get it to store the information in
the Value Object.
I get values (true/false) from a Radio button on a FORM in a JSP, press a "Next
Step" Button.
I have a "Value Object" in JSP_1, which I use the setters to store various information
obtained from the <FORM>. I then "jsp:forward" to JSP_2, set different information
and then I "jsp:forward" to JSP_3 & so on. At the end of the JSP chain only the
last setter is has the value "true", all the other values are false, despite all
being "set" to "true".
The "Value Object" is not storing the information set in previous JSPs. When I
initially create the "value object" I use;
<jsp:useBean id="myVO" class="uk.co.notify.valueobjects.MyVO" scope="request"
/>
<jsp:setProperty name="myVO" property="*"/>
In JSP_2 JSP999 I don't use <jsp:setProperty> I let the setter in the VO do
it.
I am using WebLogic 6.1 sp2 under Windows 2K Pro.
Any pointers. Thanks.
[att1.html]
Ok. here's the difference.
Hitting submit is altogether a different "new" http request. It will send a
new request from your browser to the server. Whereas, the jsp:forward is
within the server itself.
So the VO object whose scope is set to "request" will not retain its values
between 2 http request.
For such kind of parameter passing, you could very well store the info. in
user's session object.
I hope this helps.
Best Regards,
Narayan Anand
Developer Relations Engineer
BEA Systems, Inc.
"Roger Lee" <[email protected]> wrote in message
news:[email protected]...
>
> If I put the jsp:forward statement in all my JSPs before I test for my
request;
>
> <%
> if ( request.getParameter("SubmitStep2") != null ) {
> String sParameter2 = request.getParameter("SubmitStep2");
> if (sParameter2.equals("Next Step")) {
> // CODE ETC
> }
> }
>
> The jsp will chain right to the last JSP and all the values set in my
ValueObject
> will remain set.
>
> Why does hitting a submitt button;
>
> <input type="submit" name="SubmitStep2" value="Next Step">
>
> cause the VO to lose previous stored values.
>
> Any information would be appreciated.
>
> Roger Lee
>
>
> "Roger Lee" <[email protected]> wrote:
> >
> >Narayan,
> >
> >I got your example working fine.
> >
> >I added a few more debug statements and it appears that as I enter JSP
> >2 the value
> >"set" in JSP 1 is stored okay (boolean true).
> >
> >However after the "submit" of the button in JSP which forwards us to
> >JSP 3 is
> >pressed all the values are reset to their default value (false).
> >
> >
> >"Narayan Anand" <[email protected]> wrote:
> >>Hi Roger,
> >>
> >>I will look into your code.
> >>In the meantime, pls try my test case in your system and see if you
> >can
> >>run
> >>that without any problem.
> >>
> >>Best Regards,
> >>Narayan Anand
> >>Developer Relations Engineer
> >>BEA Systems, Inc.
> >>
> >>"Roger Lee" <[email protected]> wrote in message
> >>news:[email protected]...
> >>>
> >>> Narayan,
> >>>
> >>> Thanks for your reply. My code seems to be the same as yours! I still
> >>can't get
> >>> the JSPs to "set" the VO and pass it down the chain of JSPs. When
> >I
> >>get
> >>the last
> >>> JSP the first three have the boolean value set to false, whilst the
> >>last
> >>one is
> >>> set to the value chosen (true).
> >>>
> >>> I have attached the JSPs and VO in the attached ZIP file. It must
> >be
> >>something
> >>> obvious, which I can't see!
> >>>
> >>> Regards,
> >>>
> >>> Roger Lee
> >>>
> >>>
> >>> "Narayan Anand" <[email protected]> wrote:
> >>> >
> >>> >
> >>> >
> >>> >------=_NextPart_001_02EB_01C257F2.2EC54EA0
> >>> >
> >>> >Hi Roger,
> >>> >
> >>> >I can still view my previous reply to your post.
> >>>
>
>>>http://216.148.48.100/cgi-bin/dnewsweb?cmd=3Darticle&group=3Dweblogic.dev
=
> >>> >eloper.interest.jsp&item=3D10138&utag=3D
> >>> >
> >>> >Just now I tested this again.
> >>> >WLS6.1SP2 on Win2k.
> >>> >
> >>> >JSP1 - sets one value using setProperty tag.
> >>> >JSP2 - sets second property using the VO's setter.
> >>> >JSP3 - retrieve and prints the values using the VO's getters and
> >also
> >>> >=
> >>> >using the getProperty tag.
> >>> >
> >>> >attached are all the jsp's and value object.
> >>> >Please test it in your environment. It should work.
> >>> >Then compare it with your code to see the difference.
> >>> >
> >>> >I hope this will help to resolve the issue.
> >>> >
> >>> >Regards,
> >>> >Narayan Anand
> >>> >Developer Relations Engineer
> >>> >BEA WebLogic Support
> >>> >
> >>> >
> >>> >
> >>> >
> >>> >
> >>> > "Roger Lee" <[email protected]> wrote in message =
> >>> >news:[email protected]...
> >>> >
> >>> > Someone posted a response from BEA which has since disappeared,
> >>it
> >>> >was =
> >>> >no different
> >>> > from what I was doing and it I still can't get it to store the
> >=
> >>> >information in
> >>> > the Value Object.
> >>> >
> >>> > I get values (true/false) from a Radio button on a FORM in a JSP,
> >>=
> >>> >press a "Next
> >>> > Step" Button.
> >>> >
> >>> > I have a "Value Object" in JSP_1, which I use the setters to store
> >>> >=
> >>> >various information
> >>> > obtained from the <FORM>. I then "jsp:forward" to JSP_2, set
different
> >>> >=
> >>> >information
> >>> > and then I "jsp:forward" to JSP_3 & so on. At the end of the JSP
> >>chain
> >>> >=
> >>> >only the
> >>> > last setter is has the value "true", all the other values are
false,
> >>> >=
> >>> >despite all
> >>> > being "set" to "true".
> >>> >
> >>> > The "Value Object" is not storing the information set in previous
> >>=
> >>> >JSPs. When I
> >>> > initially create the "value object" I use;=20
> >>> >
> >>> > <jsp:useBean id=3D"myVO" class=3D"uk.co.notify.valueobjects.MyVO"
> >>=
> >>> >scope=3D"request"
> >>> > />=20
> >>> > <jsp:setProperty name=3D"myVO" property=3D"*"/>=20
> >>> >
> >>> > In JSP_2 JSP999 I don't use <jsp:setProperty> I let the setter
> >>in
> >>> >=
> >>> >the VO do
> >>> > it.
> >>> >
> >>> > I am using WebLogic 6.1 sp2 under Windows 2K Pro.=20
> >>> >
> >>> > Any pointers. Thanks.=20
> >>> >
> >>> >
> >>> >------=_NextPart_001_02EB_01C257F2.2EC54EA0
> >>> >
> >>> ><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
> >>> ><HTML><HEAD>
> >>> ><META http-equiv=3DContent-Type content=3D"text/html; =
> >>> >charset=3Diso-8859-1">
> >>> ><META content=3D"MSHTML 5.50.4134.600" name=3DGENERATOR>
> >>> ><STYLE></STYLE>
> >>> ></HEAD>
> >>> ><BODY bgColor=3D#ffffff>
> >>> ><DIV><FONT face=3DArial size=3D2>Hi Roger,</FONT></DIV>
> >>> ><DIV><FONT face=3DArial size=3D2></FONT> </DIV>
> >>> ><DIV><FONT face=3DArial size=3D2>I can still view my previous reply
> >>to
> >>> >=
> >>> >your=20
> >>> >post.</FONT></DIV>
> >>> ><DIV><FONT face=3DArial size=3D2><A=20
> >>>
>href=3D"http://216.148.48.100/cgi-bin/dnewsweb?cmd=3Darticle&group=3D=
> >>> >weblogic.developer.interest.jsp&item=3D10138&utag">http://216.148=
> >>>
>..48.100/cgi-bin/dnewsweb?cmd=3Darticle&group=3Dweblogic.developer.int=
> >>> >erest.jsp&item=3D10138&utag</A>=3D</FONT></DIV>
> >>> ><DIV><FONT face=3DArial size=3D2></FONT> </DIV>
> >>> ><DIV><FONT face=3DArial size=3D2>Just now I tested this =
> >>> >again.</FONT></DIV>
> >>> ><DIV><FONT face=3DArial size=3D2>WLS6.1SP2 on Win2k.</FONT></DIV>
> >>> ><DIV><FONT face=3DArial size=3D2></FONT> </DIV>
> >>> ><DIV><FONT face=3DArial size=3D2>JSP1 - sets one value using
setProperty
> >>> >=
> >>> >
> >>> >tag.</FONT></DIV>
> >>> ><DIV><FONT face=3DArial size=3D2>JSP2 - sets second property using
> >>the
> >>> >=
> >>> >VO's=20
> >>> >setter.</FONT></DIV>
> >>> ><DIV><FONT face=3DArial size=3D2>JSP3 - retrieve and prints the
values
> >>> >=
> >>> >using the=20
> >>> >VO's getters and also using the getProperty tag.</FONT></DIV>
> >>> ><DIV><FONT face=3DArial size=3D2></FONT> </DIV>
> >>> ><DIV><FONT face=3DArial size=3D2>attached are all the jsp's and
value=20
> >>> >object.</FONT></DIV>
> >>> ><DIV><FONT face=3DArial size=3D2>Please test it in your environment.
> >>> >It =
> >>> >should=20
> >>> >work.</FONT></DIV>
> >>> ><DIV><FONT face=3DArial size=3D2>Then compare it with your code to
> >>see
> >>> >=
> >>> >the=20
> >>> >difference.</FONT></DIV>
> >>> ><DIV><FONT face=3DArial size=3D2></FONT> </DIV>
> >>> ><DIV><FONT face=3DArial size=3D2>I hope this will help to resolve
> >>the=20
> >>> >issue.</FONT></DIV>
> >>> ><DIV><FONT face=3DArial size=3D2></FONT> </DIV>
> >>> ><DIV><FONT face=3DArial size=3D2>Regards,<BR>Narayan
Anand<BR>Developer
> >>> >=
> >>> >Relations=20
> >>> >Engineer<BR>BEA WebLogic Support</FONT></DIV>
> >>> ><DIV><FONT face=3DArial size=3D2></FONT> </DIV>
> >>> ><DIV><FONT face=3DArial size=3D2></FONT> </DIV>
> >>> ><DIV><FONT face=3DArial size=3D2></FONT> </DIV>
> >>> ><DIV><FONT face=3DArial size=3D2></FONT> </DIV>
> >>> ><DIV><FONT face=3DArial size=3D2></FONT> </DIV>
> >>> ><BLOCKQUOTE=20
> >>> >style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px;
> >>=
> >>> >BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
> >>> > <DIV>"Roger Lee" <<A=20
> >>> > href=3D"mailto:[email protected]">[email protected]</A>> wrote
> >in
> >>> >=
> >>> >message <A=20
> >>> > =
> >>>
>
>>>href=3D"news:[email protected]">news:[email protected]
=
> >>> >a.com</A>...</DIV><BR>Someone=20
> >>> > posted a response from BEA which has since disappeared, it was
> >no=20
> >>> > different<BR>from what I was doing and it I still can't get it
> >to
> >>=
> >>> >store the=20
> >>> > information in<BR>the Value Object.<BR><BR>I get values
(true/false)
> >>> >=
> >>> >from a=20
> >>> > Radio button on a FORM in a JSP, press a "Next<BR>Step" =
> >>> >Button.<BR><BR>I have=20
> >>> > a "Value Object" in JSP_1, which I use the setters to store
various=20
> >>> > information<BR>obtained from the <FORM>. I then "jsp:forward"
> >>> >to =
> >>> >JSP_2,=20
> >>> > set different information<BR>and then I "jsp:forward" to JSP_3
> >&
> >>> >=
> >>> >so on. At=20
> >>> > the end of the JSP chain only the<BR>last setter is has the value
> >>=
> >>> >"true", all=20
> >>> > the other values are false, despite all<BR>being "set" to =
> >>> >"true".<BR><BR>The=20
> >>> > "Value Object" is not storing the information set in previous JSPs.
> >>> >=
> >>> >When=20
> >>> > I<BR>initially create the "value object" I use; =
> >>> ><BR><BR><jsp:useBean=20
> >>> > id=3D"myVO" class=3D"uk.co.notify.valueobjects.MyVO" =
> >>> >scope=3D"request"<BR>/>=20
> >>> > <BR><jsp:setProperty name=3D"myVO" property=3D"*"/> <BR><BR>In
> >>> >=
> >>> >JSP_2=20
> >>> > JSP999 I don't use <jsp:setProperty> I let the setter in the
> >>> >=
> >>> >VO=20
> >>> > do<BR>it.<BR><BR>I am using WebLogic 6.1 sp2 under Windows 2K Pro.
> >>> >=
> >>> ><BR><BR>Any=20
> >>> > pointers. Thanks. <BR></BLOCKQUOTE></BODY></HTML>
> >>> >
> >>> >------=_NextPart_001_02EB_01C257F2.2EC54EA0--
> >>> >
> >>> >
> >>> ><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
> >>> ><HTML>
> >>> ><HEAD>
> >>> ><TITLE>Reusing JavaBeans in JSP</TITLE>
> >>> ><LINK REL=STYLESHEET
> >>> > HREF="My-Style-Sheet.css"
> >>> > TYPE="text/css">
> >>> ></HEAD>
> >>> >
> >>> ><BODY>
> >>> >
> >>> ><CENTER>
> >>> ><TABLE BORDER=5>
> >>> > <TR><TH CLASS="TITLE">
> >>> > Reusing JavaBeans in JSP</TABLE>
> >>> ></CENTER>
> >>> ><P>
> >>> >
> >>> ><jsp:useBean id="test" scope="request" class="hall.SimpleBean" />
> >>> ><jsp:setProperty name="test"
> >>> > property="message"
> >>> > value="Hello forward WWW" />
> >>> >
> >>> ><jsp:forward page="/myjsp2.jsp" />
> >>> >
> >>> ></BODY>
> >>> ></HTML>
> >>> >
> >>> >
> >>> >
> >>> ><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
> >>> ><HTML>
> >>> ><HEAD>
> >>> ><TITLE>Reusing JavaBeans in JSP</TITLE>
> >>> ><LINK REL=STYLESHEET
> >>> > HREF="My-Style-Sheet.css"
> >>> > TYPE="text/css">
> >>> ></HEAD>
> >>> >
> >>> ><BODY>
> >>> >
> >>> ><CENTER>
> >>> ><TABLE BORDER=5>
> >>> > <TR><TH CLASS="TITLE">
> >>> > Reusing JavaBeans in 2 JSP</TABLE>
> >>> ></CENTER>
> >>> ><P>
> >>> >
> >>> ><jsp:useBean id="test" scope="request" class="hall.SimpleBean" />
> >>> >
> >>> > <% test.setMessage1("Second message1 using setters"); %>
> >>> >
> >>> >
> >>> ><jsp:forward page="/myjsp3.jsp" />
> >>> >
> >>> >
> >>> ></BODY>
> >>> ></HTML>
> >>> >
> >>> >
> >>> >
> >>> ><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
> >>> ><HTML>
> >>> ><HEAD>
> >>> ><TITLE>Reusing JavaBeans in JSP</TITLE>
> >>> ><LINK REL=STYLESHEET
> >>> > HREF="My-Style-Sheet.css"
> >>> > TYPE="text/css">
> >>> ></HEAD>
> >>> >
> >>> ><BODY>
> >>> >
> >>> ><CENTER>
> >>> ><TABLE BORDER=5>
> >>> > <TR><TH CLASS="TITLE">
> >>> > Reusing JavaBeans in 2 JSP</TABLE>
> >>> ></CENTER>
> >>> ><P>
> >>> >
> >>> ><jsp:useBean id="test" scope="request" class="hall.SimpleBean" />
> >>> >
> >>> ><%
> >>> >System.out.println("\nMessage is :"+test.getMessage());
> >>> >System.out.println("\nMessage1 is :"+test.getMessage1());
> >>> >%>
> >>> >
> >>> ><H1>Message: <I>
> >>> ><jsp:getProperty name="test" property="message" />
> >>> ></I></H1>
> >>> >
> >>> ><H1>Message1: <I>
> >>> ><jsp:getProperty name="test" property="message1" />
> >>> ></I></H1>
> >>> >
> >>> >
> >>> ></BODY>
> >>> ></HTML>
> >>> >
> >>> >
> >>> >
> >>> >package hall;
> >>> >
> >>> >public class SimpleBean {
> >>> > private String message = "No message specified";
> >>> > private String message1 = "No message1 specified";
> >>> >
> >>> > public String getMessage() {
> >>> > return(message);
> >>> > }
> >>> >
> >>> > public void setMessage(String message) {
> >>> > this.message = message;
> >>> > }
> >>> >
> >>> > public String getMessage1() {
> >>> > return(message1);
> >>> > }
> >>> >
> >>> > public void setMessage1(String message1) {
> >>> > this.message1 = message1;
> >>> > }
> >>> >}
> >>> >
> >>> >
> >>>
> >>
> >>
> >
>
-
Dynamically create Value Objects from XML file
Hi
I want to create a value object from Xml file dynamically,like in the xml file i have the name of the variable and the datatype of the variable.is it possible do that,if so how.Read about apache's Digester tool. This is part of the Jakartha project. This tool helps in creating java objects from the XML files. I am not sure, if that is what u r looking for.
-
Best Practice Question - Business Logic in Value Objects?
Just wondering what people's thoughts on best practices for setting properties of Value Objects.
For instance, I have several getter/setters in one of my Value Objects with logic in the setter that uses the value to set values of other properties.
For example, I have a Value Object that has the following properties:
category (of type Category, which is another Value Object with properties "name" and "id")
categoryId (of type int)
categoryUpdated (of type Boolean)
I have a collection of Category Objects in the Model. When I set the categoryId of this class, I set the "categoryUpdated" to true, and dispatch an CairngormEvent to that find the "category" with the specified "categoryId" and set the "category" property to this item.
So what is the best practice? To simply make the "categoryId" a public variable, and create a new Event/Command to perform all this logic? Or is it ok to do it all in the Value Object setter?
Thanks.Hi Eric,
I can't speak for best practices, but the only logic I've ever added to a VO were getters: an example was a set of getters on an airline flight VO to get overall flight departure/arrival times/cities from an array of flight segments in a property of the VO.
I feel uneasy (in the nicest possible way) about your VO for two reasons: firstly it has a strong dependency on bits of the Cairngorm framework to look up the category (and VOs normally don't need to depend on anything), and secondly the intent of Commands in Cairngorm is more to represent user gestures than to wire up VO properties (I often see people shoehorning stuff into Commands that might be better of as plain old business utility classes). I would rather see an UpdateCategoryCommand (that's what the user is trying to do?) that updates categoryId and hits a delegate to populate the category property.
That said you might have a very good reason for doing this. Could you tell us where the code is that's setting categoryId, and if anything is using categoryUpdated?
Cheers,
Robin -
Authorization Issue with Custom Pending Value Object and Anonymous Users
Hi,
I am just converting my demo from version 7.1 to 7.2. I am not doing upgrade. The demo uses a custom pending value object USER_REQUEST. The idea is that new employee goes to Java AS as anonymous user and enters her details and store where she will work. After submitting request there is an approval process using custom entry type USER_REQUEST. If the request is approved then IdM converts USER_REQUEST into MX_PERSON entry. This works nice in 7.1 but I am having problems with replicating this in 7.2. I created new UI task accessible by anonymous that creates new USER_REQUEST entry. I also assigned role idm.anonymous with UME action idm_anonymous to UME built in group Anonymous users.
My problem is with the field STORE. This field is a reference field to another custom entry type STORE (this entry type will be used in context based assignment). Every new employee must selects a store where she will work. The problem is when user clicks on button "Select". Web dynpro terminates and returns authorization error. I also tested this with entry type MX_ROLE. I added attribute MXREF_MX_ROLE and same issue. So it seems that just assigning UME action idm_anonymous is not enough to list objects from identity store. I found a workaround for this issue. When I assign also UME action idm_authenticated to Anonymous users then it does not dump and I get a pop up window where I can search for store. It does not seem right to assign idm_authenticated to anonymous users.
Another issue is with display task for entry type USER_REQUEST. I assigned a display task to entry STORE and I set that Anonymous have access to this task in Access control tab. I assigned default value to the field store. So when a user opens page she can see a hyper link to display already assigned store. When user clicks on this hyper link it opens a new pop up window and user must authenticate against Java AS. After successful authentication the display task for entry STORE is displayed. I would assume that anonymous user can display it without authentication.
So to me it seems like authorization checks have been changed in 7.2 versions and are more strict for anonymous tasks. Hence my question is how can I implement my scenario. Am I missing some configuration or what's the proper solution to my two issues? I don't count assigning idm_authenticated to Anonymous users as a solution. This workaround does not solve my second issue.
ThanksSome of the folks from Trondheim labs check, but rather infrequently. There's another person who I guess is in consulting that also checks from time to time.
Sorry I can't help you with your main question...
Matt -
Mapping Value Objects to Java Classes
Hi All,
I have one Java Class:
public class MyBean {
private ArrayList numbers;
I have created one mapping value object for the same in Flex:
package vo
import mx.collections.ArrayCollection;
[RemoteClass(alias="com.tcs.example.MyBean")]
public class MyBean
public function MyBean()
public var numbers:ArrayCollection;
but when I fetch the object using Remote Object, the returned object has "numbers" as null even though I'm returning from Java a filled ArrayList.
Does any one know Why is it happening and what should I do for this.
Thanks in advanceDo you have getNumbers and setNumbers methods on your java bean?
Try to activate the logs on blazeDS to see what's going on. -
Java Object won't serialize to Value Object
I downloaded the blazeds-turnkey-3.2.0.3978.zip. Using Eclipse I created the testdrive-update flex project and copied the source code from the flex-src.zip and also from the C:\BlazeDS\tomcat\webapps\samples directory. After using the C:\BlazeDS\sampledb>startdb.bat to start the database, I can run the "testdrive-update" sample just fine from with in Eclipse. If I use the Flex Debugging perspective to look at what the srv.getProducts.lastResult returns, I can see that the Product.java was converted to the Product.as value object as seen in the next picture...
I modified the testdrive-update to run a select againt a parts table in one of my databases. I modified the Product.java and Product.as to match the simple parts list that I am returning from the ProductService.Java. When I run the code, it returns the parts. But, in debug mode I noticed that it is not using my value object when the data is passed back to the flex app. The data is stored as basic objects in an ArrayCollection as seen in the picture below.
Why does it not use my Value Object?
I have tried a few different things and can't get the data to come back as Value Objects...
Here is my code....
<<<<<<<<<<<<<<<<<<< Product.as >>>>>>>>>>>>>>>>>>>>>
package
[Bindable]
[RemoteClass(alias="flex.samples.product.Product")]
public class Product
public var partNum:String;
public var description:String;
public var active:String;
public var uom:String;
public function Product()
<<<<<<<<<<<<<<< Product.java >>>>>>>>>>>>>>>>>>>>>>>>>>>
package flex.samples.product;
public class Product {
private String partNum;
private String description;
private String active;
private String uom;
public Product() {
public Product(String partNum, String description, String active, String uom) {
this.partNum = partNum;
this.description = description;
this.active = active;
this.uom = uom;
public String getPartNum() {
return partNum;
public void setPartNum(String partNum) {
this.partNum = partNum;
public String getDescription() {
return description;
public void setDescription(String description) {
this.description = description;
public String getActive() {
return active;
public void setActive(String active) {
this.active = active;
public String getUom() {
return uom;
public void setUom(String uom) {
this.uom = uom;
<<<<<<<<<<<<<<<< ProductService.java >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
package flex.samples.product;
import java.util.ArrayList;
import java.util.List;
import java.sql.*;
import flex.samples.ConnectionHelper;
import flex.samples.DAOException;
public class ProductService {
public List getProducts() throws DAOException {
List list = new ArrayList();
Connection c = null;
// try {
// c = ConnectionHelper.getConnection();
// Statement s = c.createStatement();
// ResultSet rs = s.executeQuery("SELECT * FROM product ORDER BY name");
// while (rs.next()) {
// list.add(new Product(rs.getInt("product_id"),
// rs.getString("name"),
// rs.getString("description"),
// rs.getString("image"),
// rs.getString("category"),
// rs.getDouble("price"),
// rs.getInt("qty_in_stock")));
try {
c = ConnectionHelper.getConnection();
Statement s = c.createStatement();
ResultSet rs = s.executeQuery("SELECT * FROM ae_i_inv_e ORDER BY PART");
while (rs.next()) {
Product myProd = new Product(rs.getString("part"),
rs.getString("description"),
rs.getString("active"),
rs.getString("inv_uom"));
System.out.println("getPartNum:|"+myProd.getPartNum()+"|desc:"+myProd.getDescription()+
"|active:"+myProd.getActive()+"|uom:"+myProd.getUom());
list.add(myProd);
// list.add(new Product(rs.getString("part"),
// rs.getString("description"),
// rs.getString("active"),
// rs.getString("inv_uom")));
} catch (SQLException e) {
e.printStackTrace();
throw new DAOException(e);
} finally {
ConnectionHelper.close(c);
return list;Hi, More info.. I built a new object from within the target doc and the same trouble is happening to the new object now too. All the other layers in the doc respond to keyframe changes. This new and only 3D object is behaving in the exact same fashion as the previous one. I tried to shift the order of the layers and no change. Here is a screen shot of the3D object and it's "ghost". with timeline screen shot too. This is truly baffling!! Any ideas? Anyone else with a similar experience? Is it something else in the doc that is interfering? I could not find any other threads with this problem. thanks for ANY help you can offer.
-
Dynamic value objects in flex and coldfusion 9
I'm writing a program for a company that does registrations for conventions and trade-shows. The problem I'm having is that each different client wants to store different data for each show. Most of the data is the same (attendee's name, address, etc...), but each show has some customizations that it wants to have... So each database for each show is going to be different...
Right now, the only way I know how to transfer data from Flex to ColdFusion is via a Value Object. (Well, the only good way to do it, that is.) My problem comes when a client wants a particular database customized. I have MANY questions about this...
1) How do I tell my Value Object what fields we've added to or changed in the database without re-writing the entire VO (in both the .AS and .CFC files) and re-compiling my program? In other words, I need a dynamic VO that changes automatcially with the database.
2) If there is a way to dynamically create a VO in Flex (and from a few blog posts I've seen, it seems there is a way), how do I tell CF9 what the structure of that dynamically-created VO is? Without re-writing a bunch of .CFC files every time I add or change a field in the database, that is...
3) How do I reference the dynamically-created fields in my Flex program? Right now, for example, I can define a variable called attendeeInfo as type attendeeInfoVO, and then reference things like attendeeInfo.first_name, attendeeInfo.last_name, etc... How do I reference a field programmatcially when I don't know what it's going to be called beforehand?
4) How do I make my program display/modify those dynamically-created fields? Right now, using the attendeeInfo example above, I can create a TextInput with an id="firstNameInput" and just say firstNameInput.text = "{attendeeInfo.first_name}". That won't work when I have no clue how many dynamically-created fields there are, or even what kind of data they're going to store... How do I deal with this?
5) Is there something other than VOs that would fit this situation better? Am I limiting myself by using VOs in the first place? Is it just plain impossible to do this with VOs? And if so, what are my alternatives? I need a structured object that can be passed around with a single reference -- I absolutely DO NOT want to pass a bunch of references to a bunch of different variables -- that's why I used VOs from the very beginning.
6) Can I simply PAY someone at Adobe for one-on-one help here? Do they have experts that you can "buy" for a few hours? What's the charge for that, if such a thing is available? Or, is this problem well-explained somewhere on the Web, and I just haven't found it yet?
I'm very confused here, and it seems like I might have to re-write a ton of code, which I'm not looking forward to... Ugh... I appreciate any help you can give me...
Thanks,
Laurence MacNeill
Mableton, Georgia, USAThis blog post is pretty close to what I want:
http://justinjmoses.wordpress.com/2008/10/10/flex-dynamic-bindable-value-objects/
So there are the dynamic value objects I was looking for. But the blog-poster is using LINQ and .Net 3.5. I'm using ColdFusion9.
So, how do I get ColdFusion9 to deal with that? How do you get CF9 to recognize the fact that you've changed the VO, and deal with it appropriately?
Thanks,
L. -
Requirements to put my own value object into the context
Hello,
are there any requirements to put my own value object into the context?
I got following exception
An error has occurred:
"Failed to process the request."
Please contact your system administrator.
Hide details
Web Dynpro product information:
Product: null, Vendor: SAP AG, Version: null, Build ID: 6.3006.00.0000.20040617153350.0000, Build Date: Mon Aug 16 09:18:37 CEST 2004
Error stacktrace:
java.lang.ClassCastException
at com.sap.tc.webdynpro.progmodel.context.Paths.getAttributeInfoFor(Paths.java:186)
at com.sap.tc.webdynpro.clientimpl.html.uielib.standard.uradapter.DropDownByKeyAdapter.setViewAndNodeElement(DropDownByKeyAdapter.java:230)
at com.sap.tc.webdynpro.clientimpl.html.uielements.adaptmgr.URAdapterManager.getAdapterFor(URAdapterManager.java:230)
at com.sap.tc.webdynpro.clientimpl.html.uielements.adaptmgr.URAdapterManager.getAdapterFor(URAdapterManager.java:63)
at com.sap.tc.webdynpro.clientimpl.html.uielib.standard.uradapter.TableAdapter$ContentCell.getContent(TableAdapter.java:1295)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.SapTableCellRenderer.render(SapTableCellRenderer.java:57)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.SapTableRowRenderer.renderSapTableRowFragment(SapTableRowRenderer.java:67)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.SapTableRowRenderer.render(SapTableRowRenderer.java:33)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.SapTableDefaultBodyRenderer.renderSapTableDefaultBodyFragment(SapTableDefaultBodyRenderer.java:96)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.SapTableDefaultBodyRenderer.render(SapTableDefaultBodyRenderer.java:29)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.SapTableRenderer.renderSapTableFragment(SapTableRenderer.java:394)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.SapTableRenderer.render(SapTableRenderer.java:49)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.GridLayoutRenderer.renderGridLayoutCellFragment(GridLayoutRenderer.java:609)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.GridLayoutRenderer.renderGridLayoutRowFragment(GridLayoutRenderer.java:312)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.GridLayoutRenderer.renderGridLayoutFragment(GridLayoutRenderer.java:250)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.GridLayoutRenderer.render(GridLayoutRenderer.java:57)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.ScrollContainerRenderer.renderScrollContainerFragment(ScrollContainerRenderer.java:235)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.ScrollContainerRenderer.render(ScrollContainerRenderer.java:41)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.ViewContainerRenderer.renderViewContainerFragment(ViewContainerRenderer.java:93)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.ViewContainerRenderer.render(ViewContainerRenderer.java:33)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.GridLayoutRenderer.renderGridLayoutCellFragment(GridLayoutRenderer.java:609)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.GridLayoutRenderer.renderGridLayoutRowFragment(GridLayoutRenderer.java:312)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.GridLayoutRenderer.renderGridLayoutFragment(GridLayoutRenderer.java:250)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.GridLayoutRenderer.render(GridLayoutRenderer.java:57)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.ScrollContainerRenderer.renderScrollContainerFragment(ScrollContainerRenderer.java:235)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.ScrollContainerRenderer.render(ScrollContainerRenderer.java:41)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.ViewContainerRenderer.renderViewContainerFragment(ViewContainerRenderer.java:93)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.ie6.ViewContainerRenderer.render(ViewContainerRenderer.java:33)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.UiWindowRenderer.render(UiWindowRenderer.java:32)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:268)
at com.sap.tc.webdynpro.clientimpl.html.renderer.uielements.base.AbstractRenderManager.render(AbstractRenderManager.java:94)
at com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.sendHtml(HtmlClient.java:454)
at com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.sendResponse(HtmlClient.java:286)
at com.sap.tc.webdynpro.clientimpl.html.client.HtmlClient.sendResponse(HtmlClient.java:178)
at com.sap.tc.webdynpro.clientserver.task.WebDynproMainTask.execute(WebDynproMainTask.java:632)
at com.sap.tc.webdynpro.clientserver.cal.AbstractClient.executeTasks(AbstractClient.java:57)
at com.sap.tc.webdynpro.clientserver.cal.ClientManager.doProcessing(ClientManager.java:249)
at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doWebDynproProcessing(DispatcherServlet.java:139)
at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doContent(DispatcherServlet.java:101)
at com.sap.tc.webdynpro.serverimpl.defaultimpl.DispatcherServlet.doPost(DispatcherServlet.java:45)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:383)
at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:263)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:333)
at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:311)
at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:811)
at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:235)
at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:147)
at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37)
at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71)
at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
at java.security.AccessController.doPrivileged(Native Method)
at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:94)
at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:144)Hi Jurgen,
Can you please explain what you are trying to do in detail. Do you want to create a Node dynamically in the context or, you want to populate a Node in a Context???
The stack trace, does not reveal what you want to do with the value object!
Thanks and Regards,
Vishnu Prasad Hegde -
Business Objects, Value Objects and more
Hey,
I've got a general question about business objects (aka entity objects or data transfer objects). The scenario I am using is not one of my own, but it might be a future one. Thus, I'd really appreciate all feedback.
Let's say that i've got a desktop application which purpose is to manage personal DVD collections. Shortly explained, what i would do here is to create a class Dvd to represent a physical DVD. Then i would create the classes DvdServices and DvdDao. The DvdServices class is what my application will use to retrive and store Dvd instances, and takes care of all session and transaction handling. The DvdDao class is where all database communication takes place. This class will only be used by the DvdServices class.
Now, say that i would want to keep things simple and use the same business object both in the front end and the back end (yes, i'm using Hibernate). That is, the Dvd instances returned by the DvdServices class is the ones i also would like to use in my GUI. This is where i start to get a little uncertain about best practice.
Let us say that i use an instance of a Dvd to present some information about a dvd to the user. However, the user would not only like to see what's already stored about that dvd - but also edit some details related to it (such as the title, description or the like). What i would do here (to support editing), is to modify the Dvd class so that it holds a DvdAttributes object which contains all its editable values like title and description (in other words, the state - except for the id and a timestamp value). Thus, i also modify the DvdServices class and create a method called updateDvd(Dvd dvd, DvdAttributes attributes). The method updateDvd() in the DvdServices class, internally, makes a reference to the existing DvdAttributes, applies the new DvdAttributes to the Dvd instance, and tries to save it. If something goes wrong, transaction is rolled back, and the old DvdAttributes are applied to the Dvd class in order to reflect the state of the Dvd instance.I like to think of the Dvd instance as the business object, and the DvdAttributes instance as a related value object (the terminology is probably all wrong here?).
My question regarding all this is wether it "adheres" to what one might consider as "best practices" (if something like that exists in relation to this)? Could i do things smarter in this case? Is there something which does not make sense (always good to hear a second opinion!).
All feedback appreciated!sbrattla wrote:
Hey,
I've got a general question about business objects (aka entity objects or data transfer objects). The scenario I am using is not one of my own, but it might be a future one. Thus, I'd really appreciate all feedback.
I don't believe a DTO would ever be considered a business object.
Let's say that i've got a desktop application which purpose is to manage personal DVD collections. Shortly explained, what i would do here is to create a class Dvd to represent a physical DVD. Then i would create the classes DvdServices and DvdDao. The DvdServices class is what my application will use to retrive and store Dvd instances, and takes care of all session and transaction handling. The DvdDao class is where all database communication takes place. This class will only be used by the DvdServices class.
Now, say that i would want to keep things simple and use the same business object both in the front end and the back end (yes, i'm using Hibernate). That is, the Dvd instances returned by the DvdServices class is the ones i also would like to use in my GUI. This is where i start to get a little uncertain about best practice.
It appears that 'Dvd' is in fact a DTO. Probably best to name it as such - DvdDto.
Let us say that i use an instance of a Dvd to present some information about a dvd to the user. However, the user would not only like to see what's already stored about that dvd - but also edit some details related to it (such as the title, description or the like). What i would do here (to support editing), is to modify the Dvd class so that it holds a DvdAttributes object which contains all its editable values like title and description (in other words, the state - except for the id and a timestamp value). Thus, i also modify the DvdServices class and create a method called updateDvd(Dvd dvd, DvdAttributes attributes). The method updateDvd() in the DvdServices class, internally, makes a reference to the existing DvdAttributes, applies the new DvdAttributes to the Dvd instance, and tries to save it. If something goes wrong, transaction is rolled back, and the old DvdAttributes are applied to the Dvd class in order to reflect the state of the Dvd instance.I like to think of the Dvd instance as the business object, and the DvdAttributes instance as a related value object (the terminology is probably all wrong here?).
As stated no.
Process flow would normally be like this.
Happy path (it worked)
1. Query - returns DvdDto
2. GUI - display DvdDto
3. Modify DvdDto
4. Update (send to server/backend) DvdDto
5. (Return - It worked.)
Sad path (it failed)
1. Query - returns DvdDto
2. GUI - display DvdDto
3. Modify DvdDto
4. Update (send to server/backend) DvdDto
5. Exception is thrown
6. (Return - It failed)
Step 6 is a bit ambigous because it depends on the user and the actual client/server relationship. It could be an exception, a message or just true/false (false is failed.)
In the above there is no step that corrects or alters the DvdDto instance that was thrown. One reason for this is that it might be a minot mistake on the users part and if you destroy everything they alread typed in they are not going to be happy. -
Are there any shortcuts for creating Value Object Classes?
Hi,
I'm using a Remote Object to connect to my server
(pyAMF/Django). I'm getting stuck with the creation of Value Object
Classes. It doesn't seem very DRY to have a class on my server
representing the data model and then have to recreate that class
and all its properties in my Flex app.
Are there any shortcuts for creating client side VOs from
server side data?
I was thinking about declaring an empty VO class in Flex, and
then dynamically assigning/casting my Proxy object to that class.
It seems like that approach may cause problems for the Flex
compiler though.
Any hints?
Thanks!quote:
Originally posted by:
tptackab
Oh man, do I feel your pain. I'm not sure what middle-tier
technology you're using, but I'm using Java (w/Spring) and I
absolutely hate having to create and maintain two sets of VO (aka
data transfer - DTO) object for Java and Flex.
One thing that has helped me in that area is a free tool from
Farata Systems called
DTO2Fx. If you're using Java and Eclipse, it's a great time saver.
You simply install a (very lightweight) Eclipse plugin, add a
single annotation to your Java VO classes, and it automatically
generates your Flex VOs. It even creates a base and extended
version of each VO on the AS3 side so you can add code to the
extended VO without fear of having your changes overwritten when it
regenerates your Flex VOs.
Here's a like to thier
PDF that
gives instructions and a download link. I had it up and running in
my application in less than 30 minutes!
I'm using Python/Django serverside (PYAMF is my AMF
serializer). -
What is authorization object and how to create it for a table
Hi All,
What is authorization object and how to create it for a table?
ThanksHi
Authorization
For authorization checks, there are many ways of linking authorization objects with user actions in an SAP system. The following discusses three possibilities in the context of ABAP programming.
Authorization Check for Transactions
You can directly link authorization objects with transaction codes. You can enter values for the fields of an authorization object in the transaction maintenance. Before the transaction is executed, the system compares these values with the values in the user master record and only starts the transaction if the appropriate authorization exists.
Authorization Check for ABAP Programs
For ABAP programs, the two objects S_DEVELOP (program development and program execution) and S_PROGRAM (program maintenance) exist. They contains a field P_GROUP that is connected with the program attribute authorization group. Thus, you can assign users program-specific authorizations for individual ABAP programs.
Authorization Check in ABAP Programs
A more sophisticated, user-programmed authorization check is possible using the Authority-Check statement. It allows you to check the entries in the user master record for specific authorization objects against any other values. Therefore, if a transaction or program is not sufficiently protected or not every user that is authorized to use the program can also execute all the actions, this statement must be used.
AUTHORITY-CHECK OBJECT object
ID name1 FIELD f1
ID name2 FIELD f2
ID namen FIELD fn.
object is the name of an authorization object. With name1, name2 ... , and so on, you must list all fields of the authorization object object. With f1, f2 ... , and so on, you must specify the values that the system is to check against the entries in the relevant authorization of the user master record. The AUTHORITY-CHECK statement searches for the specified object in the user profile and checks the useru2019s authorizations for all values of f1, f2 ... . You can avoid checking a field name1, name2 ... by replacing FIELD f1 FIELD f2 with DUMMY.
After the FIELD addition, you can only specify an elementary field, not a selection table. However, there are function modules available that execute the AUTHORITY-CHECK statement for all values of selection tables. The AUTHORITY-CHECK statement is supported by a statement pattern.
Only if the user has all authorizations, is the return value sy-subrc of the AUTHORITY-CHECK statement set to 0. The most important return values are:
· 0: The user has an authorization for all specified values.
· 4: The user does not have the authorization.
· 8: The number of specified fields is incorrect.
· 12: The specified authorization object does not exist.
A list of all possible return values is available in the ABAP keyword documentation. The content of sy-subrc has to be closely examined to ascertain the result of the authorization check and react accordingly.
REPORT demo_authorithy_check.
PARAMETERS pa_carr LIKE sflight-carrid.
DATA wa_flights LIKE demo_focc.
AT SELECTION-SCREEN.
AUTHORITY-CHECK OBJECT 'S_CARRID'
ID 'CARRID' FIELD pa_carr
ID 'ACTVT' FIELD '03'.
IF sy-subrc = 4.
MESSAGE e045(sabapdocu) WITH pa_carr.
ELSEIF sy-subrc <> 0.
MESSAGE e184(sabapdocu) WITH text-010.
ENDIF.
START-OF-SELECTION.
SELECT carrid connid fldate seatsmax seatsocc
FROM sflight
INTO CORRESPONDING FIELDS OF wa_flights
WHERE carrid = pa_carr.
WRITE: / wa_flights-carrid,
wa_flights-connid,
wa_flights-fldate,
wa_flights-seatsmax,
wa_flights-seatsocc.
ENDSELECT.
Regards
Hitesh -
Value Objects still relevant in EJB 2.0?
I came across the concept of using Value Objects to get better performance from EJBs as they reduce the number of remote calls to invoke to retrieve object property values.
However, with the introduction of LocalHome and Local interfaces for EJB 2.0, is it still useful to have value objects to pass data around, typically between EJBs and the Controller (typically servlets/JSPs or session beans that implement business logic)?Not so fast.
I wouldn't be so quick to get rid of VOs simply because local interfaces exist now. Keep in mind that using local interfaces is not always the right answer to your problem (since there are still situations where the client and server are not co-located within a given VM).
Also, there are times when the brittleness of your API should be considered. If a method takes many parameters, it is often benificial to pass a single VO as a paramater rather than multiple individual parameters. This really comes into play when methods are modified to take different arguments (e.g. adding a new argument).
Consider a method on a bean used to update a student's records for example.public StudentVO update(String firstName, String middleInitial, String lastName, int age, String ssn, String status) throws UpdateException; is much more brittle than public StudentVO update(StudentVO student) throws UpdateException;Consider what would happen if a design change makes GPA and gradeLevel part of a student's profile.
The second method's signature would remain the same. The signature of the first method however would now read public StudentVO update(String firstName, String middleInitial, String lastName, int age, String ssn, String status, float gpa, int gradeLevel) throws UpdateException; This change would "break" the calls made by any callers of this method. While there are pros and cons to this (as well as other ways to solve this issue, such as method overloading, etc.), it is something to consider when deciding whether a value object should be used in certain situations.
Hope this adds another point of view to the discussion.
Note: I'm using Value Object (VO), Data Transfer Object (DTO) and Transfer Object (TO) to me the same thing here. -
Data Access Object vs. Value Object
What is the relationship, if any, between DAOs and VOs?
For example, suppose DAOs are used by entity beans to abstract data persistence and VOs are also used by entity beans to exchange data with the web tier. Would the DAOs extend the VOs or would they be unrelated?Dave,
Dan, thanks for the response. This does help.
However, I am assuming that the DAOs have getters and
setters for each field/attribute. Is this correct?Typically, no.
DAOs typically accept one or more Value Objects as arguments, providing a much coarser interface. In this case, if the VO changes, the interface of the DAO does not change, and thus its clients do not feel the ripple effect.
If so, why not extend the VO (which implements the
getters and setters) and just put the persistence in
the DAO?
Thanks again for your time. I am just trying to
understand all the issues here.Thanks for your questions,
Dan
>
Regards,
Dave -
Read records from VALUES OBJECT using the INTERATOR
Hi
I'm trying to read records from my value object with interator these way:
ValidaUsu usuVO = new ValidaUsu();
for (Iterator it = usuVO it.hasNext(); ) {
System.out.println(" User from VO: " + usuVO.getUsuario());
But i don't know what i`m doing wrong ?
Could help me?
ThanksHi Gajendra,
You can mainly read records from MDM (in a DDIC structure) using ABAP API's using the following function modules/methods:
1. RETRIEVE: This is used to generically retrieve records from tables. Attributes and Values can also be retrieved.
2. RETRIEVE SIMPLE: Retrieve records from MDM in a simple way.( simple data types).
3. RETRIEVE CHECKOUT: Retrieves all checked out ID's.
4. RETRIEVE ATTRIBUTES: Retrieves attribute(s) from a Taxanomy table.
You will find all these methods in the following interface
Interface : IF_MDM_CORE_SERVICES
Hope it helps.
*Please reward points if found useful.
Thanks and Regards
Nitin Jain
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