| From: | M(dot)Feldtmann(at)t-online(dot)de (Marten Feldtmann) |
|---|---|
| To: | Jeff Eckermann <jeckermann(at)verio(dot)net> |
| Cc: | "'Tom Lane'" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "'pgsql-general(at)postgresql(dot)org'" <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Index on substring? |
| Date: | 2000-10-24 19:12:01 |
| Message-ID: | 39F5DF01.AF14943@toppoint.de |
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| Lists: | pgsql-general |
Jeff Eckermann schrieb:
>
> Tom,
> Thanks very much for your full and clear answer.
> It's hard to imagine a general use for this facility, anyway.
> For me this is a one-off exercise, albeit a big one.
> Regards
>
There're commercial OO persistance frameworks out there, which create
there own OID's (actually they consists out of three numbers) all these
numbers are converted to base 36 and concatenated to a string with size
15.
One part of this string is a class number of the instance you
have just loaded. Therefore if you look for instances of a
special class you may query a substring of this OID ....
Just as an practical usage ....
Marten
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