ENCAPSULATION

• DATABASE: OBJECT = OPERATIONS + DATA - HOWEVER:
  
  
  • DATA STRUCTURE CAN BE PART OF THE INTERFACE: I.E. IT IS VISIBLE TO APPLICATIONS
    
    
    • VISIBILITY OF ATTRIBUTES NECESSARY FOR QUERIES: PREDICATES ON ATTRIBUTES
    • ALTERNATIVELY SIMPLE ATTRIBUTE ACCESS METHODS COULD BE PROVIDED
    
    
  
  

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Ugo O. Gagliardi
GSD-6306 Spring 2003-2004