Execution of entity validation multiple times (adf bc 10g)

Question

Implementing entity method validators sometimes causes the validation (e.g. validateEntity method) to execute multiple times. We have figured out that this case occurs when we call method setAttribute programmatically when we implement business rules on the entity level. For example in many cases that we want to enforce dml operation execution, we override the method prepareForDML so that the framework works as follows:
•     calls validateEntity, validates entity for the first time
•     calls prepareForDML –> setAttribute this method invalidates the entity row
•     calls validateEntity, validates entity for a second time
I can understand that sometimes multiple entity validation is necessary and important, there are cases though that this behaviour is not necessary and additionally it degrades performance especially when we utilize sql queries inside the validation (as it executes the queries multiple times).
Is there any workaround to avoid multiple execution of entity validation or enforce the validation to occur only once, for example after the prepareForDML method and not before?
Edited by: user647567 on 9 Σεπ 2010 6:58 πμ

Answer 1

Hi there:
I don't think JDeveloper provides a switch to bypass the Entity Validation. Too much meddling. MVC model has those layers and advocates reducing unnecessary dependencies between layers. Entities and Views are both in Model layer though. But you can build a view without an Entity and vise versa you can have an Entity that doesn't have default views. So my understanding is the Entity Validation is quite necessary.
Though from View layer, on a jspx page, you can use command buttons and set their "immediate" property to "true" to bypass form validation temporarily and postpone it to form submission time.
My understanding for Entity validator is they should be light weighted. You properly should avoid SQL queries directly in them. Instead you should use EntityImpl or ViewObjImpl/ViewRowImpl instead of SQL queries directly in validator.
If you feel my answer helpful to you, please mark it so.
Thanks,
Alex
Edited by: Alexbie on Sep 9, 2010 11:11 AM