Advances in database programing languages by Fançois Bancilhon; Peter Buneman (eds.)

February 23, 2017 | Sql | By admin | 0 Comments

By Fançois Bancilhon; Peter Buneman (eds.)

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Let's take a closer look at the common shapes in this template and how you can use them in your own diagrams. • COM Object - the COM Object shape is represented by a rectangle with the familiar lollipop shapes indicating the interfaces exposed by the object. Since, in the Windows COM world, every object has to implement the IUnknown interface, the shape defaults to one interface named IUnknown when you drag it onto a new diagram. We've already seen the COM Object shape in our earlier example; here is the default shape as seen immediately after it's dragged onto the Visio drawing page.

Notice how data flows from the shape representing the Customer into the Process Order step. Data flows from the Products and Customers data stores for looking up product and customer details. The primary flow of data out of Process Order is into the Orders data store - a new order is created. Each of the shapes used in a DFD is rather simple. Let's have a look at the four shapes. • Interface - in the example above, our customer was represented by an Interface shape. In a DFD, external references are called Interfaces.

Since the buttons at the bottom of the form are so important for controlling the behavior of the wizard, the Visio template comes with some extra functionality for controlling how the buttons are drawn. In the course of running the Wizard both the Back and Next buttons may or may not be enabled. For instance when a user is on the first step in the wizard, there's no point in enabling the Back button - there's nowhere to go. To disable the Back button, right click on it and select Disable Button.

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