How does ABAP webdynpro architecture works......

Hi experts,
I am new to Abap webdynpro and i have a task to finish.
Basically i gone through many documents on WDA, but was able to understand very little.
I have following questions --
1. When u create component, what is the use of component controller?
2.. What exactly context and context node difference? Do we need to create an attribute(input box, button etc), under one context?
3. How can i read the date entered by user? where to read? If i want to read a particular iinput box data and save it to database table, how and where it has to be done?
4. How can i read the table data, complete table of UI?
5. What is an interface controller/component?
I still have lot of doubts about understanding MVC architecture, but I am so so sorry as I have little scope OO abap, so fining difficult to understand.
Kindly if someone explain me I would be greatfully thankfull to you.
Thanks in advance,
Niraja.

Hi Niraja,
I am replying to your questions 1 by 1.
+When u create component, what is the use of component controller?
+
Ans A component controller contains the context,attributes, methods etc for a component. No component can exist without this.Even a view has its own controller having same contents.
All the tabs which you see after clicking on COMPONENT CONTROLLER constitute the controller.
What exactly context and context node difference? Do we need to create an attribute(input box, button etc), under one context?
Ans: Context itself is a context node, but the only difference is that its the root and has unchangeable properties.It has a fixed cardinality of 1..1 where as a node can have different properties.
All nodes and attributes for different UIs are created in the context only.
How can i read the date entered by user? where to read? If i want to read a particular iinput box data and save it to database table, how and where it has to be done?
Ans: Data can be read in form of nodes and attributes. Every UI element for example an Input field will be bound to a attribute.
You can read these values by code ( use CODE WIZARD).
You can code in any methods given under method tabs.
You can create your own methods like event handlers for buttons and different events. You can write all your queries in these methods
+How can i read the table data, complete table of UI?
+
Ans: If u mean by reading the whole node data, I would suggest you to use code wizard and understand the code.
5. What is an interface controller/component?
Ans: If you want to share your component and make it available for use in other components you define your make your methods and context visible in this controller .
Please see the link below for whole Web Dynpro ABAP help.
[WD ABAP|http://help.sap.com/saphelp_nw04s/helpdata/en/43/1f6442a3d9e72ce10000000a1550b0/frameset.htm]
I would suggest you to understand things and try them and then come with doubts.
Regards,
Sumit Oberoi

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