From: | Richard Huxton <dev(at)archonet(dot)com> |
---|---|
To: | Jeff Schnitzer <jeff(at)infohazard(dot)org> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Case insensitive primary keys |
Date: | 2001-03-13 08:15:45 |
Message-ID: | 3AADD732.FF59D59F@archonet.com |
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Thread: | |
Lists: | pgsql-general |
Jeff Schnitzer wrote:
>
> Hello! I've got a question:
>
> I'm trying to create a system with a string (varchar) primary key which
> is *not* case sensitive. Is there any way I can create a primary key
> column which automatically takes care of this?
you can try something like:
CREATE UNIQUE INDEX foo_idx ON tbl (lower(foo));
That will prevent entries duplicates that differ only in case.
> I'm coming at this problem from a java app server, so my hands are
> somewhat bound regarding the queries used to insert and search the
> table. There are solutions, but the ideal (for me) would be for the
> database to ignore the case of my key column. Is this possible?
If you can't change LIKE to ILIKE or foo='x' to lower(foo) = lower('x')
you'll have problems with comparisons.
The only other thing(s) I can suggest are:
1. add a rule/trigger to inserts/updates/selects to do the lower() stuff
for you.
2. you _could_ write your own type, but this is last resort really.
- Richard Huxton
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