文件名称:
Type.Inheritance.and.Relational.Theory
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文件大小: 10mb
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上传时间: 2016-10-18
详细说明： Type inheritance is that phenomenon according to which we can say, for example, that every square is also a rectangle, and so properties that apply to rectangles in general apply to squares in particular. In other words, squares are a subtype of rectangles, and rectangles are a supertype of squares. Recognizing and acting upon such subtype / supertype relationships provides numerous benefits: Certainly it can help in data modeling, and it can also provide for code reuse in applications. For these reasons, many languages, including the standard database language SQL, have long supported such relationships. However, there doesn’t seem to be any consensus in the community at large on a formal, rigorous, and abstract model of inheritance. This book proposes such a model, one that enjoys several advantages over other approaches, not the least of which it is that it’s fully compatible with the well known relational model of data. Topics the model covers include: Both single and multiple inheritance Scalar, tuple, and relation inheritance Type lattices and union and intersection types Polymorphism and substitutability Compile time and run time binding All of these topics are described in detail in the book, with numerous illustrative examples, exercises, and answers. The book also discusses several alternative approaches. In particular, it includes a detailed discussion and analysis of inheritance as supported in the SQL standard. Table of Contents PART I PRELIMINARIES Chapter 1 Background Chapter 2 Types without Inheritance Chapter 3 Types with Inheritance Chapter 4 The Inheritance Model PART II SCALAR TYPES, SINGLE INHERITANCE Chapter 5 Basic Definitions Chapter 6 Scalar Values with Inheritance Chapter 7 Scalar Variables with Inheritance Chapter 8 Specialization by Constraint etc. Chapter 9 Equality Comparisons etc. Chapter 10 Treating and Type Testing Chapter 11 Substitutability Chapter 12 Union and Dummy Types Chapter 13 Interlude: The S by C Controversy PART III SCALAR TYPES, MULTIPLE INHERITANCE Chapter 14 An Overview of Multiple Inheritance Chapter 15 IM Prescriptions 8 - 9 Revisited Chapter 16 IM Prescriptions 10 - 20 Revisited PART IV TUPLE AND RELATION INHERITANCE Chapter 17 Tuple / Relation Values with Inheritance Chapter 18 Tuple / Relation Values with Inheritance (cont.) Chapter 19 Tuple / Relation Maximal and Minimal Types etc. Chapter 20 Tuple / Relation Variables with Inheritance PART V OTHER APPROACHES Chapter 21 Structural Inheritance Chapter 22 Inheritance in SQL Appendix A Encapsulation Is a Red Herring Appendix B Persistence Not Orthogonal to Type Appendix C Glossary of Terms ...展开收缩
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