9
Internal Persistent LOBs

Use Case Model

In this chapter we describe how to work with Internal Persistent LOBs in terms of use cases. We discuss each operation on a LOB (such as "Write Data to a LOB") in terms of a use case by that name. Table 9-1, "Use Case Model: Internal Persistent LOBs Basic Operations", lists all use cases.

Graphic Summary of Use Case Model

A summary figure, Figure 9-1, "Use Case Model Diagram: Internal Persistent LOBs (part 1 of 2)" , locates all use cases in a single drawing. In the HTML version of this document, use this figure to navigate to the use case by clicking on the use case title.

Individual Use Cases

Each detailed internal persistent LOB use case operation description is laid out as follows:

• Use case figure. A figure that depicts the use case (see the "How to Interpret the Use Case Diagrams" in the Preface, for a description of how to interpret these diagrams).

• Purpose. The purpose of this use case with regards to LOBs.

• Usage Notes. Guidelines to assist your implementation of the LOB operation.

• Syntax. The main syntax used to perform the LOBs related activity.

• Scenario. Portrays one implementation of the use case in terms of the hypothetical multimedia application. See Chapter 8, "Sample Application".

• Examples. Examples in each programmatic environment which illustrate the use case.These are based on the multimedia application and table Multimedia_tab described in Chapter 8, "Sample Application".