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he misconception that there s no such thing as the relational model is, unfortunately, quite widespread (indeed, the term relational model often appears in the literature with the indefinite article a instead of the definite article the). What follows is an attempt to debunk this myth. I wrote it originally as a response to something I read in a book titled rather curiously, I thought Joe Celko s Data and Databases: Concepts in Practice (Morgan Kaufmann, 1999), by Joe Celko. 18 of that book is called Different Relational Models, and the first sentence of that chapter reads as follows: There is no such thing as the relational model for databases anymore [sic] than there is just one geometry. Now, Celko does have a point here, in a way. Here s an extract from a recent book of my own (The Database Relational Model: A Retrospective Review and Analysis, Addison-Wesley, 2001): What then exactly is the relational model If you ve been following the discussions [in previous chapters] carefully, you ll have noticed that Codd s own definitions evolved somewhat [over the years] ... One consequence of this fact is that critics have been able to accuse Codd in particular, and relational advocates in general, of moving the goalposts far too much. For example, Mike Stonebraker has written that one can think of four different versions of [the relational model]: Version 1: Defined by the 1970 CACM paper Version 2: Defined by the 1981 Turing Award paper Version 3: Defined by Codd s 12 rules and scoring system Version 4: Defined by Codd s book

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Let me interrupt myself briefly to explain the references here. First of all, of course, E. F. Codd is the first and onlie begetter of the original model, and all four references are to writings by him. The 1970 CACM paper is A Relational Model of Data for Large Shared Data Banks, CACM 13, No. 6 (June 1970). The 1981 Turing Award paper is Relational Database: A Practical Foundation for Productivity, CACM 25, No. 2 (February 1982). The 12 rules and the accompanying scoring

To test your own understanding, run the test code from the samples to see how the code works. The Tip last line of code that calls the defined method illustrates that the proxy method is called before the original method.

system are described in Codd s Computerworld articles Is Your DBMS Really Relational and Does Your DBMS Run By The Rules (October 14th and October 21st, 1985) Finally, Codd s book is The Relational Model For Database Management Version 2 (Addison-Wesley, 1990) Now back to the quote from my book: Perhaps because we re a trifle sensitive to such criticisms, Hugh Darwen and I have tried to provide [in our book Databases, Types, and the Relational Model: The Third Manifesto, 3rd edition, Addison-Wesley, 2006] our own careful statement of what we believe the relational model is (or ought to be!) Indeed, we d like [that] Manifesto to be seen in part as a definitive statement in this regard.

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I refer you to [that book] itself for the details; here just let me say that we see our contribution in this area as primarily one of dotting a few i s and crossing a few t s that Codd himself left undotted or uncrossed in his own original work We most certainly do not want to be thought of as departing in any major respect from Codd s original vision; indeed, the whole of the Manifesto is very much in the spirit of Codd s ideas and continues along the path that he originally laid down To say it again, therefore, Celko does have a point, and a sensible discussion of how and, more importantly, why the relational model has evolved over the years could be a useful contribution His 18 offers no such discussion, however.

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When implementing the Proxy pattern for a method, keep the following points in mind: The Proxy pattern for a method is applied when you want to filter, preprocess, and postprocess parameters before (if) they are passed to the method. The implementation of the proxy method is responsible for calling the original method. The Proxy pattern for a method is best implemented by embedding functions within functions. The advantage of using an embedded approach is that the function can be referenced by other object instances without corrupting the method implementation. The Proxy pattern for a method can be embedded multiple times.