PPT Slide

ADTs (Black Box)

• To define and use a "black box ADT", a user will
  • Implement its internal structure and functions in an external programming language (e.g., C/C++, Java)
  • Use the DDL to register the type with the DBMS
    • Size of an instance of the type
    • Input (constructor) and output functions
    • Other functions and operators, including signatures and linkable implementations
    • Costs and other properties for query optimizer
  • Use the new type like a built-in data type
    • Now available for defining columns of tables
    • Functions and operators become available in queries

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