Multiple inheritance possible or not, if not how can we overcome that.

What is the utility of the RunOn property

Application objects such as reports, tables, and methods can run on the application object server (AOS) or the client. An object can also have the RunOn property value set to Called from. Objects set to Called from can run from either the client or server, depending on where the object is called from. This topic describes the Run On property, tiers that class objects can run on, and hints about using AOSRun Mode.

Default value of RunOn for Classes

Called from Menultems Client

What is difference between new & construct method

new(): used to create a memory to the object.

Construct(): You should create a static construct method for each class. The method should return an instance of the class.

What is the difference between form init() & DS init()

Form init(): init is activated immediately after new and creates the run-time image of the form.

DS init(): Creates a data source query based on the data source properties. The form data source init method creates the query to fetch data from the database and sets up links if the form is linked to another form.

When a form opens what are the sequential methods called.

Form init(), DataSource init(), Form run(), DataSource executeQuery(), canClose(), close().

Where is the best place to write code to perform filter in a form

FormDataSource - executeQuery() and call this method in the design field of the form.

What are the different types of menu items available, explain each of them

• Display - for Form
• Output - for Report
• Action - for classes

What are the most important methods on the Report?

• Init()
• run()
• fetch()
• send()
• print()

How can we sort the DS, what facility we can get in by placing fields in Ranges

this.query().datasource(1).addsortfield (fieldnum(tablename,fieldname),sorti ng:ascending);