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Page xvii Incorporating the File Operations Subsystem into the Samsona Bank Teller System Example 388 Summary 392 Q&A 392 Workshop 393 Quiz 393 Exercises 393 Day 18 The Error-Processing and Exception-Handling Subsystem 395 An Overview of the Error-Processing and Exception-Handling Subsystem 396 The Purpose of This Subsystem 398 Raising Errors and Exceptions 401 The Error-Processing and Exception-Handling Subsystem Object Model 402 Modeling the Subsystem Class Hierarchy Model 402 Describing the Classes in the Subsystem 404 Describing the Methods 404 Practical Guidelines for Implementing the Error-Processing and Exception-Handling Subsystem 405 Incorporating the Subsystem into the Samsona Bank Teller System Example 405 Summary 408 Q&A 408 Workshop 409 Quiz 409 Exercises 409 Day 19 The Database Access Subsystem 411 An Overview of the Database Access Subsystem 412 Understanding the Purpose of This Subsystem 413 Implementing a Common Interface for Different Database Models 413 Keeping Data Controls in Their Proper Perspective 422 Modeling the Database Access Object Model 423 The Database Access Class Hierarchy Model 425
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