Apple WebObjects 5 Uživatelský manuál stáhnout pdf (Strana 56)

56 How Direct to Web Works

 Apple Computer, Inc. January 2002

CHAPTER 5

Direct to Web Applications

Direct to Web template displaying a list page for Movie objects can determine that

it needs to display the title, release date, category, and other attributes for each

movie on the page (Figure 5-11).

Figure 5-11 Determining attributes from the entity

Direct to Web applications can be configured using a Java applet called the Direct

to Web Assistant. The configuration information is stored as a database of rules.

Rules say something like “if the task page is a list page and the entity is the Movie

entity, do not display the banner.” Each rule has a priority and rules with higher

priority override rules with lower priority. Direct to Web defines a set of default

rules that define the basic application behavior. You can define higher priority rules

Product objects

Server

partNum W4378

color Red

size XL

retail 48.99

Product attributes

Name External type

partNum VARCHAR2

color VARCHAR2

size VARCHAR2

retail NUMBER

Product entity

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Apple WebObjects 5 Uživatelský manuál Strana 56