Re: Lower case

On Wed, 26 Jan 2005 12:01:49 +0000, Vladimir S. Petukhov
<vladimir@sycore.org> wrote:

I want to do case-insensitivity search, like this
... WHERE lower (column_name) LIKE lower (%value%);
This work fine for English..
But i need search for Russian words, lower() operator does not work with
Russian (non-English) chars, but ORDER works fine...
???????????????
What's wrong?

Welllllll... Have you made an initdb with apropriate locale setting?
Try:
pg_controldata /var/lib/postgresql/data
(or wherever your db is)
You should see lines like:
LC_COLLATE: C
LC_CTYPE: C

If you are using Unicode these should be ru_RU.UTF-8, if not then
ru_RU.KOI8-R or something. If you see 'C', or 'en_EN' or similar
then you won't have Russian lower/upper support (and ORDER BY
was just a "luck" :)).

What you can do:
pg_dump the database, initdb --locale=ru_RU; pg_restore the database.

Ohhh, and since you're at it, there is one thing which makes me
wonder and if you don't mind, please try it. :) This will require
plperlu language, so 'createlang plperlu' and that you use
unicode encoding in your database.

Try if this function:
CREATE OR REPLACE FUNCTION lc(text) RETURNS text AS $$
utf8::decode($_[0]);
return lc($_[0]);
$$ LANGUAGE plperlu STABLE;

Used as select lc(your_text_column) from your_table;
works for Russian alphabet. :) I'm just cuuurious! :)

Regards,
Dawid

Tino Wildenhain wrote:

Hi,

On Wed, 2005-01-26 at 12:01 +0000, Vladimir S. Petukhov wrote:

Hi!

Sorry for my English..

I want to do case-insensitivity search, like this
... WHERE lower (column_name) LIKE lower (%value%);
This work fine for English..
But i need search for Russian words, lower() operator does not work with
Russian (non-English) chars, but ORDER works fine...
???????????????
What's wrong?

what about ILIKE operator?

miso

pg_controldata /var/pgsql/data
...
LC_COLLATE: ru_RU
LC_CTYPE: ru_RU

bash-2.05b# psql -l
List of databases
Name | Owner | Encoding
-----------+----------+----------
testdb | postgres | UNICODE

And LIKE, ILIKE, ~ do not recognize upper/lower case..
SELECT ... ORDER BY do something like that (in English Alphabet):
a
AAAA
aaaaa
Tast12
tes
test
Test12
test12

?:(

On Wednesday 26 January 2005 10:15, Dawid Kuroczko wrote:

On Wed, 26 Jan 2005 12:01:49 +0000, Vladimir S. Petukhov

<vladimir@sycore.org> wrote:

I want to do case-insensitivity search, like this
... WHERE lower (column_name) LIKE lower (%value%);
This work fine for English..
But i need search for Russian words, lower() operator does not work with
Russian (non-English) chars, but ORDER works fine...
???????????????
What's wrong?

Welllllll... Have you made an initdb with apropriate locale setting?
Try:
pg_controldata /var/lib/postgresql/data
(or wherever your db is)
You should see lines like:
LC_COLLATE: C
LC_CTYPE: C

If you are using Unicode these should be ru_RU.UTF-8, if not then
ru_RU.KOI8-R or something. If you see 'C', or 'en_EN' or similar
then you won't have Russian lower/upper support (and ORDER BY
was just a "luck" :)).

What you can do:
pg_dump the database, initdb --locale=ru_RU; pg_restore the database.

Ohhh, and since you're at it, there is one thing which makes me
wonder and if you don't mind, please try it. :) This will require
plperlu language, so 'createlang plperlu' and that you use
unicode encoding in your database.

Try if this function:
CREATE OR REPLACE FUNCTION lc(text) RETURNS text AS $$
utf8::decode($_[0]);
return lc($_[0]);
$$ LANGUAGE plperlu STABLE;

Used as select lc(your_text_column) from your_table;
works for Russian alphabet. :) I'm just cuuurious! :)

Regards,
Dawid

--
Скунсу и не надо быть красивым. Его и так все уважают.

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