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Java 'Unhash' as T-SQL?

Mike Arney wrote a nice little hashcode function in T-SQL.

Could someone convert this java unhash code into T-SQL to complete the set...?

public static String unhash(int target) {  StringBuilder unhashed = new StringBuilder();  if (target < 0) {  // String with hash of Integer.MIN_VALUE, 0x80000000  unhashed.append("\u0915\u0009\u001e\u000c\u0002");  if (target == Integer.MIN_VALUE)  return unhashed.toString();  // Find target without sign bit set  target = target & Integer.MIN_VALUE;  }  unhash0(unhashed, target);  return unhashed.toString(); }

private static void unhash0(StringBuilder partial, int target) { int div = target / 31; int rem = target % 31;

if (div &lt;= Character.MAX_VALUE) {
    if (div != 0)
        partial.append((char) div);
    partial.append((char) rem);
} else {
    unhash0(partial, div);
    partial.append((char) rem);
}
}
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asked Jun 11 '10 at 09:27 AM in Default

JavaMan gravatar image

JavaMan
1 1 1 1

To recreate a hash system like this, you'd be better off using CLR and calling that from TSQL, rather than trying to force this through TSQL.
Jun 11 '10 at 09:55 AM Grant Fritchey ♦♦
I'm with Grant. This could be done in SQL, but you are much better off writing something like this in C# and importing it as CLR.
Jun 11 '10 at 01:37 PM TimothyAWiseman
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2 answers: sort voted first

I expect so .

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answered Jun 11 '10 at 09:35 AM

Fatherjack gravatar image

Fatherjack ♦♦
41.1k 72 77 107

Excellent! One of the best answers I've seen in a while.
Jun 11 '10 at 09:55 AM Grant Fritchey ♦♦
Thanks Fatherjack, accurate but not very helpful!
Jun 11 '10 at 10:26 AM JavaMan
@JavaMan, sorry, couldn't resist! Its a hot, tired Friday afternoon here. I think Grant has answered the question for you though, its not something suited to TSQL, much better using CLR
Jun 11 '10 at 10:37 AM Fatherjack ♦♦
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I'm not a C programmer so I don't actually know what the original code does. If someone could come up with an explanation of what is being done by the code, I'll take a crack at it just because it might be fun.

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answered Jun 13 '10 at 07:38 PM

Jeff Moden gravatar image

Jeff Moden
1.7k 1 8

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asked: Jun 11 '10 at 09:27 AM

Seen: 1273 times

Last Updated: Jun 11 '10 at 09:27 AM