Registered objects with Unit of work

Hi,
I am using the following code for persisting some data to the database. I register the following objects with the UOW obtained. If there is any exception with the business rules method(shown below) , the code uow.commit() is never invoked.
My question here is what happens the registered objects in that uow if commit is never invoked.
Any help will be appreciated.
Thanks
Priya
node=(DeviceNode) uow.registerObject(node);
station=(Station)uow.registerObject(station);
user=(User)uow.registerObject(user);
//Call a method to do some businees rules check
startWork(node,station,user);
uow.commit;

It depends on how you set things up. If you are managing the connection directly via Toplink (no pooling or containers or transactions), then if you dont commit, it doesnt save. If you are using JTS, registering the object will save it to the database barring any unchecked exceptions.
Zev.

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Issues updating with Unit of Work

Hello,
I think, I might be missing a point about toplink. I know that when I need to update an Object, i find the current object in cache(ReadObject) and then register that object to get a cloned object and do updates on the cloned object and then commit it.
Everything works fine in above scenario, IF AND ONLY IF, I set the attributes of the cloned object individually. But the update doesn't work if I set the cloned object to a totally different object (clonedObj = otherObj) Here otherObj has changed attributes which i want to be updated. Toplink somehow doesn't like it.
How do i do it?
Sample working code:
public void mergeData(Object obj, Class c){
try{
ReadObjectQuery query = ReadObjectQuery(obj);
// get the object with the primary key as the one passed in
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Object objectClone = tx.register(persistableObject);
//It is a User object
((User)objectClone).setName("New Neeraj");
tx.commit();
Sample NOT working code
public void mergeData(Object obj, Class c){
try{
ReadObjectQuery query = ReadObjectQuery(obj);
// get the object with the primary key as the one passed in
Object persistableObject = session.executeQuery(query);
Object objectClone = tx.register(persistableObject);
objectClone = obj //passed in object
tx.commit();
Is it becuase of the ReadObjectQuery using the same object as used to set up the cloned object?
Thanks in advance for the help.
Regards,
Neeraj

Don,
This is what the documentation says related to mergeClone:
"Merge the attributes of the clone into the unit of work copy. This can be used for objects that are returned from the client through RMI serialization (or another serialization mechanism), because the RMI object will be a clone this will merge its attributes correctly to preserve object identity within the unit of work and record its changes. The object and its private owned parts are merged."
What is the significance RMI and serialization in this.
I tries mergeClone locally (using the UOW) and it works fine, but just want to make sure that I understand what the documentation says.
Also, if you will be kind enough to explain the difference between mergeClone and mergeCloneWithReferences.
Thanks,
Neeraj

TopLink Article HowTo Manipulate objects using Unit of Work

http://www.oracle.com/technology/sample_code/tech/java/codesnippet/toplink/unitofwork/readme.html
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What is the var aSession and where is it declared. Where is this code, on the class created by toplink or the class that is tied to the JSP? How can you click an add button on the jsp and get the data to add to the database?
It seems all the code and example on this site are missing, is there any reference that should you how to build a JSF app with jdev from start the finish?
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http://www.oracle.com/technology/sample_code/tech/java/codesnippet/toplink/unitofwork/readme.html
My questions are:
What is the var aSession and where is it declared. Where is this code, on the class created by toplink or the class that is tied to the JSP? How can you click an add button on the jsp and get the data to add to the database?
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Hi Kalin T,
Thanks for your prompt reply. I am running version 8.01. My problem is that i cannot select "Scale object with pane" for the controls inside a Tab control if the Tab control "Scale object with pane" is turned on. I want both the Tab control and the controls inside to be scaled, for instance an Waveform graph or an textbox when i resize my main window.
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Attachments:
Scale.vi ‏11 KB

Insertion using objects and update using queries in a single unit of work

HI All,
I have a set of objects that i want to insert and then perform some update queries ( direct queries ) on the inserted data in the same transaction. but when i register the objects and execute the update SQL's on the same data in a same unit of work, the update statements are executed first and then the inserts are happening, I've also tried with child unit of work and parent unit of work but the result is the same.
Can any one suggest a way to do object insertion and sql updates in a single transaction, Thanks in advance
Regards,
Sai Krishna

The UnitOfWork is an abstraction for the physical database query. By default nothing is actually written into the database until the UnitOfWork commits. This means making updates to new objects involves modifying them in-memory and then the updated values will be included in the INSERT during commit.
If you are having difficulty finding the newly created objects you can enable the query conforming capabilities to have modified and new objects included in query comparisons without requiring them to first be written to the database.
Doug

Stumped with registering objects

I have tried mightily, but am not getting behaviour I desire.
I would like to eventually move to using DTO's to move data in and out of my session tier, but for the short term, I am trying to get the 'quick and dirty' approach to work.
For instance,
I query say 40 objects. I store a list of them in session scope in the servlet container. The gui then will allow a user to make some changes to one of these objects, and then resubmit it to the session tier to be saved.
The problem seems to be I am not starting a unit of work before the changes start, and making the changes to clones. The servlet code does not know about toplink, it just reads a list of objects, picks an arbitrary one to edit, and then resubmits it.
I was using deepMergeClone on the object to be saved to allow toplink to get a list of differences, and this seemed to work for most scenarios, but not all. I have heard that the merge api is more for objects which have been disconnected from the session.
I have attached the methods i have written for load/save. Any feedback would be very much appreciated...espicially if it explains that this interm method will work, acknowledging I will implement a better facade pattern with DTO's in the future. (I really need demo quality soon)
Here is the load method:
public static Collection returnQueryResult(String queryBarId) {
          UnitOfWork uow= getSession().acquireUnitOfWork();
          Vector facilities= null;
          try {
               Vector results=
                    (Vector) getSession().readAllObjects(
                         QueryBarResult.class,
                         new ExpressionBuilder().get("id").equal(queryBarId));
               facilities= new Vector(results.size());
               Iterator iter= results.iterator();
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               while (iter.hasNext()) {
                    theFacility= ((QueryBarResult) iter.next()).getQueriedObject();
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               } catch (Throwable th) {
               th.printStackTrace();
          return facilities;
Here is the save:
     public static Object save(IdentifiableValue obj, String sessionName) {
          try {
               UnitOfWork uow= getSession(sessionName).acquireUnitOfWork();
               uow.registerObject(obj);
               uow.deepMergeClone(obj);
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          } catch (DatabaseException e) {
               e.printStackTrace();
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Craig,
Sorry to hear you are having such difficulty getting your demo going. Have you looked at the session-bean and jsp-Servlet demos that are shipped with TopLink. They may help you get something running quickly.
I would like to clarify some issues that you have raised.
1. The instances in the shared cache, those returned from a query against a client session, are in fact the original objects. You need to be careful not to modify these outside the context of a UnitOfWork/TX.
2. The use of the merge API is typically used when the objects are detached from the session through serialization. This means that you architecture has a serialized link between the web tier and the server tier. This is more often accomplished by wrapping your server logic with a session beans. You will also need to ensure that if the web tier and server/ejb tier are in the same JVM that the app server is not passing the object by reference instead of by value.
3. If the objects you are changing in the web-tier are not separated by a serialized link such as a session-bean then you must register the objects prior to making any changes to them.
The code you have shown seems to assume that the web application will be in the same JVM and not have a serialized link between it and the persistence layer. Then to ensure you have a copy of the object you use one UnitOfWork to copy the objects and another to persist the changes. If you were willing to have a slightly more stateful system you could just maintain the UnitOfWork and avoid having to register or merge on the save, just call UnitOfWork.commit().
To address your specific code without writing a complete novel I would suggest the following:
Here is the load method:
public static Collection returnQueryResult(String queryBarId) {
UnitOfWork uow= getSession().acquireUnitOfWork();
Vector facilities= null;
try {
// Note: reading through the UOW will register results
Vector facilities = (Vector) uow.readAllObjects(QueryBarResult.class, new ExpressionBuilder().get("id").equal(queryBarId));
uow.release(); // not going to need it any more
} catch (Throwable th) {
th.printStackTrace();
return facilities;
Here is the save:
public static Object save(IdentifiableValue obj, String sessionName) {
try {
UnitOfWork uow= getSession(sessionName).acquireUnitOfWork();
uow.readObject(obj); //ensure its cached and registered
uow.deepMergeClone(obj);
uow.commit();
} catch (DatabaseException e) {
e.printStackTrace();
return getSession(sessionName).readObject(obj);
Although this should work for all cases there will be issues if you attempt to instantiate any indirect relationships on the copies returned from the query method. These objects have been copied through a now inactive UOW. If you require lazy loading after the query I would recommend using a more stateful solution an maintaining the UOW.
I hope this helps you get your demo going quickly. Please let me know if you run into any further complications.
Doug

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Below is the save routine i use to persist my top-level objects to the database.
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Registered objects with Unit of work

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