Need more information about EO, VO and AM *.java files
HelloFriends and experts, I need your help in learning OAF.
I'm new to OAF and want to know more information about the following java classes.
When I created a simple search with EO, VO and AM page, the following java classes are created.
I want to know
What is it?
What to do with it?
where do use us it?
The sample scripts if possible?
EOImpl.java
Please correct me if I am wrong, I know that we use it to manipulate data for a particular line, such as getattribut, setattribute, delete, update, insert operations. There are different methods are been created when you create the OS if you select options in the method "generate" during step 4 on Assistant EO.
EOCollImpl.java
???
VOImpl.java
???
ViewRowImpl
???
AMImpl.java
????
Thank you
Sri.
Hi Sri,
EO:
Entity objects are essentially based on a single table that encapsulate business rules. These objects are used by the OAF page to perform update/insert/delete operations.
Inside of the EOImpl.java you will find setter() and the get accessor () Java methods that we call like accessor and mutator, each OT attribute is mapped to the column in the database table.
You can also generate a create method Validate () method.
For example: to get the value of the sequence in the OPS, you can use method Create().
VO:
VOImpl (VO): He just consist of an sql database query, you have probably noticed during execution of a query for example: VO.executeQuery ();
to run any validation it provides iteration and access to the rows in its result set.
VoRowImpl: Represents an individual line in a view object.
You will understand when you write code using objects /voRowimpl voimpl
AmImpl:
It basically performs the business logic, we will define our methods to implement the business logic.
For example: you can call a controller method and set the Amimpl.java method, you can use the initialization of the request or
you make the DML operation, etc...
Summary : the main reason why we have java file divide between EO, VO, AM is because OFA is designed with MVC design model.
in other words, isolate the responsibility of the code in each layer (model, view, controller). His bad habit of writing
all of the code in a single class file.
For example: controller class should accept the per-user setting and move these parameters files BC4J (AMImpl.java) and his work as the AMImpl.java
to execute the business logic and return the result back to the controller.
To apply the standard of coding MVC, model design, we have these java files EO, VO, AM, CO. with more practice, you will understand the different
methods defined in each of these java files.
Had
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