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Defining identifiers
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Defining identifiers
An identifier is a class attribute, or a combination of class attributes, whose
values uniquely identify each occurrence of the class. An identifier is the
OOM equivalent of a CDM identifier or a primary key or an alternate key in
a PDM.
Each class must have at least one identifier. If a class has only one identifier,
than it is designated by default as the primary identifier for the class. A
primary identifier is the main identifier for a class.
You can attach attributes or business rules to an identifier.
Identifier properties
An identifier has the following properties:
Property
Description
Maximum
length
Name
Name of the identifier
254
Code
Reference name for the identifier
254
Comment
Descriptive comment for the identifier
—
Class
Name of the class to which the identifier belongs to
254
Primary
identifier
Indicates that the identifier is the primary identifier of
the class. There can only be one primary identifier for
a given class
—
An identifier definition also includes the following properties, which are
defined on associated property sheets:
Property
Description
Attribute
Defines the characteristics of an identifier
Business rules
A rule that your business follows. Business rules guide and
document the creation of a model
Содержание Powerdesigner 7.5
Страница 1: ...OBJECT ORIENTED MODEL User s Guide POWERDESIGNER 7 5...
Страница 8: ...viii...
Страница 22: ...Defining OOM properties 12...
Страница 97: ...Chapter 2 Building an Object Oriented Model 87 4 Modify the operation display preferences 5 Click OK...
Страница 144: ...Defining check parameters 134...
Страница 208: ...Generating for XML 198 6 Click OK An XML file is generated with the file extension xml...
Страница 210: ...Customizing scripts 200...
Страница 224: ...Generating a CDM from an OOM 214...
Страница 238: ...Generating a PDM from an OOM 228...
Страница 260: ...Object language editor categories 250...
Страница 268: ...Applying business rules to objects 258...
Страница 288: ...278...