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Advanced Enterprise
Object Modeling

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This chapter discusses advanced enterprise object modeling issues not covered in the chapter "Designing Enterprise Objects." It is organized into the following sections:

• "Modeling Complex Attributes" describes how to work with RTF text, image data, and your own custom data types.

• "Modeling Relationships" describes approaches for modeling optional to-one relationships, handling null-valued
  to-one relationships, and modeling many-to-many relationships.

• "Modeling Inheritance" describes the three ways to model inheritance and the advantages and disadvantages of each.

• "Designing Database-Savvy Enterprise Objects" describes how to implement an enterprise object class that knows how to fetch its instances.

Modeling Complex Attributes

RTF Text

Images

Custom Data Types

Modeling Relationships

Modeling Optional To-One Relationships

Modeling Many-To-Many Relationships

Modeling Inheritance

Types of Inheritance

Vertical Mapping

Horizontal Mapping

Single Table Mapping

Data Access Patterns for Inheritance

Fetching and Inheritance

Delegation Hooks for Optimizing Inheritance

Java Limitation With Ambiguous To-One Relationships

Designing Database-Savvy Enterprise Objects

First Section

Legacy Legacy Mac OS X Reference Library WebObjects 4.5 Developer Documentation