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Sunday, February 05, 2012

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Menu       Home What is NDO? - Executive Overview - NDO for Developers How NDO Works - Persistent Classes - Mapping - Queries - Reverse Engineering - Inheritance, Polymorphism - Distributed Applications Licensing Support - Support Forum - FAQ - Solutions - Downloads - E-Mail Support - Tutorial Videos Online Shop Contact	Welcome!     Welcome to the NDO support forum!  Please register/login at the site if you want to post a thread. We sometimes copy support mails of common interest to the forum. They appear with anonymous sender.  Please post your messages in English language if possible. You can do your posts also in German, we will translate your post and our answer so that all users of the forum can read your posts.  The forum software requires that javascript is enabled.  Please do not insert licence information or licence keys in forum posts.  If you know a good answer to a post of another user, feel free to reply!  The forum is monitored. We reserve the right to remove posts we consider not to be useful for other forum users.  NDO Support Forum     Search Forum Home   NDO-Forum postings in english please, if possible.  Developing with NDO  Object cloning...  Object cloning    7/23/2006 4:19:10 PM Gerhard 12 posts Object cloning Hi Mirko, I would like to copy an existing database object (the copy is created by deep cloning), modify some properties and save (insert) the modified object to the database. If I make the new object persistent, I get the error that the object is already persistent. Is there any possibility to modify the copied object, that it is no longer recognized as persistent. I tried already to set the key as invalid (MyDbObject.NDOObjectId.Id.Invalidate()), but this doesn't solve the problem. The ID is automatically generated by server. Regards, Gerhard  7/24/2006 11:08:51 AM Mirko 109 posts Re: Object cloning   Hi Gerhard, how did you implement the deep cloning? If you can modify the cloning code, use the default object constructor and just spare out the NDO fields while copying the fields. All ndo field names start with _ndo. If you use the serialize/deserialize approach to clone the objects, you have to set the NDOObjectId = null and the NDOObjectState to NDOObjectState.Transient: PersistenceManager pm = new PersistenceManager(); // Creating the object Employee emp = new Employee(); emp.FirstName = "Mirko"; emp.LastName = "Matytschak"; pm.MakePersistent(emp); pm.Save(); pm.UnloadCache(); // Cloning it BinaryFormatter bf = new BinaryFormatter(); MemoryStream ms = new MemoryStream(); bf.Serialize(ms, emp); ms.Seek(0, SeekOrigin.Begin); Employee emp2 = (Employee)bf.Deserialize(ms); // Setting the NDOObjectState and NDOObjectId emp2.NDOObjectState = NDOObjectState.Transient; emp2.NDOObjectId = null; // Changing the data a little bit emp2.FirstName = emp2.FirstName + "2"; pm.MakePersistent(emp2); pm.Save(); Best Regards, Mirko  7/24/2006 3:29:10 PM Gerhard 12 posts Re: Object cloning Hi Mirko, I'm using serialize/deserialize for deep cloning. Setting NDOObjectId = null and the NDOObjectState to NDOObjectState.Transient works. Many thanks. Regards, Gerhard  Page 1 of 1   NDO-Forum postings in english please, if possible.  Developing with NDO  Object cloning... Flat View Tree View Oldest To Newest Newest To Oldest   Search  Forum Home