Creating Transient EO attribute and Mapping it to VO

Question

Hi all,
Pls suggest me the best approach/solutions.
Its to add a transient attribute to EO and update it by mapping it to a VO(using expert query) attribute.
Regards,
Santhosh.

Answer 1

Here is what I would do.
1. Create either a new, extended EO or modify the existing EO using the jDeveloper EO wizard and create the new, transient attributes through that wizard. This will automatically create EO setter and getter methods for the transient attributes. Since they are already in the EO they can use the other EO set and get methods to create the transient data. Since the new attribute is transient, the set method for it is probably not as important since transient attributes do not support DML as they are not attached to table attributes.
2. Next create a new, extended VO or modify the existing VO using the jDeveloper VO wizard adding the extended EO if one was created. At the SQL pane add the EO transient attributes to the select statement which will automatically create EO - VO mapping entries for the new fields. Be aware, jDeveloper will NOT create these properly. The VO xml will have to be edited because it will not correctly identify the EO entries in the VO xml. Shut down jDeveloper and open the VO xml using an editor. Locate your added attributes and, using an properly associated VO/EO attribute as a template, modify your VO xml so that the attributes properly match to the EO.
3. If you are using extended objects you will have to create a substitution for both the extended EO and the extended VO. At deployment you must deploy the new, extended objects and the substitution in order for everything to work properly.