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jdavidb (1361)

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J. David Blackstone has a Bachelor of Science in Computer Science and Engineering and nine years of experience at a wireless telecommunications company, where he learned Perl and never looked back. J. David has an advantage in that he works really hard, he has a passion for writing good software, and he knows many of the world's best Perl programmers.

Journal of jdavidb (1361)

Thursday February 20, 2003
11:25 AM

Gem of the day

[ #10693 ]

Today's Oracle gem is the DBMS_UTILITY.GET_HASH_VALUE function. This function takes three parameters: a VARCHAR2 string, a minimum value, and the size of the range of values, and returns a hash value. Oracle 9i, release 2 supports associative arrays in the form of PL/SQL tables indexed by VARCHAR2's, but earlier versions support indexing only by BINARY_INTEGER. However, using DBMS_UTILITY.GET_HASH_VALUE, you could build your own hash table object if you were desperate. In emergencies, it is said a skilled Jedi Master could find or manufacture his own gems and other required materials and build a lightsaber in two days, such as during the Clone Wars.

There's other uses for this, too. And, if you want a more cryptographically useful hashing algorithm, try MD5 in PL/SQL (by means of Bill Pribyl's open source PL/SQL repository).

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