scholarly journals Categorical database generalization

2003 ◽  
Vol 6 (4) ◽  
pp. 1-9 ◽  
Author(s):  
Liu Yaolin ◽  
Martin Molenaar ◽  
Al Tinghua ◽  
Liu Yanfang
Keyword(s):  
Categorical Database ◽  
Database Generalization

Lenses, fibrations and universal translations

2011 ◽  
Vol 22 (1) ◽  
pp. 25-42 ◽  
Author(s):  
MICHAEL JOHNSON ◽  
ROBERT ROSEBRUGH ◽  
R. J. WOOD
Keyword(s):  
Computer Science ◽  
Ordered Sets ◽  
Database Model ◽  
View Update ◽  
Universal Solution ◽  
Categorical Database

This paper extends the ‘lens’ concept for view updating in Computer Science beyond the categories of sets and ordered sets. It is first shown that a constant complement view updating strategy also corresponds to a lens for a categorical database model. A variation on the lens concept called a c-lens is introduced, and shown to correspond to the categorical notion of Grothendieck opfibration. This variant guarantees a universal solution to the view update problem for functorial update processes.

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