物件导向式资料库管理.ppt

Chapter 10Object-Oriented Database Management 物件導向式資料庫管理 Fundamentals of Database Management Systems by Mark L. Gillenson, Ph.D. University of Memphis Presentation by: Amita Goyal Chin, Ph.D. Virginia Commonwealth University John Wiley Sons, Inc. Chapter Objectives List several limitations in the relational database model. 列出關連式資料庫的幾項限制 Describe the object-oriented database concept. 描述物件導向式資料庫的概念 Model data using such complex relationships as generalization and aggregation, and such concepts as inheritance and polymorphism. 使用複雜的方式如一般化、聚合化、繼承、變形來模擬資料 Chapter Objectives Describe the benefits of encapsulation. 描述封裝的好處 Describe the value of developing abstract data types. 描述發展抽象資料型態的價值 Explain what an object/relational database is. 說明何是物件關連式資料庫 Hnedak Bobo Group A leading architecture and design firm headquartered in Memphis, TN. 總部在曼菲斯的建築設計公司 Uses a relational database application called the Contact Management and Lead Tracking System to keep track of its customers, potential customers, and potential projects or “leads.” 使用關連式資料庫工具管理客戶和「線索」 Hnedak Bobo Group cont’d The system is stored as an MS Access relational database running on a Compaq server. The system was implemented in 1999. It employs canned, menu-based queries written in Visual Basic. The main database tables are a Contact table with 5,500 records and an Events table that tracks every meeting, telephone call, etc. with each contact. 主要的表格是聯絡人表格（其中有5,500筆資料）以及事件表格（追蹤紀錄和聯絡人的所有會議、電話通話等資料） Historically Speaking For much of IS history the emphasis was on the programs, with the data structures and ultimately the data stored in them being a secondary consideration. The IS environment is changing from this program-centric mentality into a more data-centric one. 以程式為中心變成以資料為中心 Object Orientation 物件導向 An alternative approach to information systems and IS development. 另一種選擇 Began during the 1980s. More data-centric. 更是以資料為中心 What’s Missing in the Relational Database Concept? 關連式資料庫缺什麼 Many people would