| 摘要 |
A virtual databank object generated from one or more databanks, whereas said virtual databank object itself can be queried like any other databank, said method comprising: a member definition module for defining a virtual databank object as a combination of one or more member databanks forming the constituents of said virtual databank, whereas said virtual databank object itself in its behaviour resembles a member databank and can be queried by a user query like one of the member databanks forming its constituents, whereas when said virtual databank object being queried by a user query its member databanks receive said user query and return a first result set, said virtual databank object further comprising; a definition module for defining a query to be applied to said one or more member databanks which form the constituents of said virtual databank, said query when being executed returning a second result set formed by a subset of the entries of said one or more member databanks, said definition module module further comprising a query link operator defining a boolean operation by which said first result set resulting from said user query to said virtual databank object and said second result set resulting from the query defined in said definition module are to be connected to thereby form a final result set, said final result set effectively being the results set resulting from a user query being directed to said virtual databank object to query said virtual databank object as if it were itself a databank like one of its member databanks. |
