OBJECT ORIENTED DATA MODEL

• OBJECT ORIENTED DATA MODEL(S) TO-DATE ARE CHARACTERIZED BY:
  
  
  • NO COMMON REFERENCE MODEL
  • NO FORMAL FOUNDATION FOR THEM
  • NO STANDARD FOR OO MODELS
  
  
• DATABASE SYSTEMS REQUIRE A PROPER DATA MODEL - RELY ON CERTAIN GENERALLY ACCEPTED NOTIONS TO FORMULATE A CORE MODEL
• THE CORE MODEL DOES NOT INCLUDE MANY IMPORTANT DATABASE NOTIONS SUCH AS:
  
  
  • INTEGRITY CONSTRAINTS
  • SEMANTIC CONSTRAINTS (RELATIONSHIPS BETWEEN ENTITIES)
  
  

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Ugo O. Gagliardi
GSD-6306 Spring 2003-2004