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Declarative programming vs imperative programming

  • November 17, 2008 at 3:33 am

    #71679

    Hi All,

    I read the above topics on wikipedia. It is very interesting...But i got struck in some places...yes..i want to match the concepts with sql side...but i can't.. Can any body give example (sql code) for the above two progrramming techniques ?

    Declarative programming:

    *expresses the logic of a computation without describing its control flow.

    Imperative programming:

    *expresses the logic of a computation with describing its control flow.

    karthik

  • November 18, 2008 at 12:50 pm

    #900144

    Any inputs ?

    karthik

  • November 18, 2008 at 5:02 pm

    #900222

    Hi Karthik,

    I am far from being an expert in programming language theory but here's my two bob's worth.

    SQL uses Imperative programming. You tell the DB engine what you want done and how to do it:

    SELECT, UPDATE, EXEC, CASE, function call, etc.

    Other languages like Java provide a mechanism for Declarative programming. In Java it's Annotations.

    In a piece of code you can expose its internals so that some other piece of code somewhere else can delve into it's internals and use it's internal state to make decisions. It's a metadata thing. Maybe useful in building tools?

    See http://www.onjava.com/pub/a/onjava/2004/04/21/declarative.html and good luck with understanding the point of it.

    Peter Lavelle

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