how to classify the uploaded document's and how o store the document name whether hashed or plain...

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hi!! i need to add feature of uploading documents in my website but the problem is.
how should i classify or separate those documents... ie.whether they are horror book,comedy book etc....

i have created separate tables for these doc's so, as soon as those doc's are classified their data would be stored into d/b......

and also,how should i store the name of doc's in d/b ie. should i hash them or keep the name in plain text... which one would be more efficient which would help in searching the doc.if hashing then how should i implement it....

can someone please guide me with the above issues... i have never done these thing's before..

Thank's in advance... :)

Posted 8-Apr-12 9:06am

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-04-08T15:43:00

The genres and book features are not mutually exclusive. So, make some attributes in the form of a bitset. Something like that:

C#

 enum BookFeatureClassifiers {
    Horror = 1 << 1,  // 1
    Fantasy = 1 << 2, // 2
    Sex = 1 << 3,     // 4
    History = 1 << 4, // 8
    //...
}

Use bitwise OR operation to add an element (in the form of one of the enumeration members) to a set. (You did not indicate your language, so it could be 'And' or '|'). To check up if a bit is set, use bitwise AND operation and compare the result with 0 (which means that the bit is clear, set otherwise).

To store it in a database, cast the enumeration value to an integer numeric value of sufficient size.

—SA