PostgreSQL 7.0.1 multi-byte (MB) support README May 20 2000
Tatsuo Ishii
ishii@postgresql.org
http://www.sra.co.jp/people/t-ishii/PostgreSQL/
[] 1. P¥ۤF (Tatsuo Ishii) !
2. ҵL, ĶY~, p cch@cc.kmu.edu.tw
0. ²
MB 䴩OF PostgreSQL Bzh줸զr (multi-byte character),
Ҧp: EUC (Extended Unix Code), Unicode (Τ@X) M Mule internal code
(hyX). b MB 䴩U, AiHbWܦ (regexp), LIKE
L@Ǩ禡ϥΦh줸զr. w]sXtΥiMAw PostgreSQL
ɪ initdb(1) RO, i createdb(1) ROΫإ߸Ʈw SQL ROMw.
ҥHAiHhӤPsXtΪƮw.
MB 䴩]ѨMF@ 8 줸줸զr (]t ISO-8859-1) D,
(ڨèSҦDѨMF, ڥuOT{Fjkհ榨\,
Ӥ@Ǫkyrb MB ɤUiHϥ. pGAbϥ 8 줸rɵo{F
D, гq)
1. pϥ
sĶ PostgreSQL e, configure ɨϥ multibyte ﶵ
% ./configure --enable-multibyte[=encoding_system]
% ./configure --enable-multibyte[=sXt]
䤤sXtΥiHwU䤤@:
SQL_ASCII ASCII
EUC_JP Japanese EUC
EUC_CN Chinese EUC
EUC_KR Korean EUC
EUC_TW Taiwan EUC
UNICODE Unicode(UTF-8)
MULE_INTERNAL Mule internal
LATIN1 ISO 8859-1 English and some European languages
LATIN2 ISO 8859-2 English and some European languages
LATIN3 ISO 8859-3 English and some European languages
LATIN4 ISO 8859-4 English and some European languages
LATIN5 ISO 8859-5 English and some European languages
KOI8 KOI8-R
WIN Windows CP1251
ALT Windows CP866
Ҧp:
% ./configure --enable-multibyte=EUC_JP
pGٲwsXt, w]ȴNO SQL_ASCII.
2. p]wsX
initdb ROwq PostgresSQL w˫᪺w]sX, Ҧp:
% initdb -E EUC_JP
Nw]sX]w EUC_JP (Extended Unix Code for Japanese), pGAw
r, A]iH "--encoding" Ӥ "-E". pGSϥ -E
--encoding ﶵ, söɪ]w|w].
AiHإߨϥΤPsXƮw:
% createdb -E EUC_KR korean
oөRO|إߤ@ӥs "korean" Ʈw, Өĥ EUC_KR sX.
t~@Ӥk, Oϥ SQL RO, ]iHFP˪ت:
CREATE DATABASE korean WITH ENCODING = 'EUC_KR';
b pg_database tγW (system catalog) @ "encoding" ,
NOΨӬ@ӸƮwsX. AiH psql -l ζiJ psql \l
ROӬdݸƮwĥΦؽsX:
$ psql -l
List of databases
Database | Owner | Encoding
---------------+---------+---------------
euc_cn | t-ishii | EUC_CN
euc_jp | t-ishii | EUC_JP
euc_kr | t-ishii | EUC_KR
euc_tw | t-ishii | EUC_TW
mule_internal | t-ishii | MULE_INTERNAL
regression | t-ishii | SQL_ASCII
template1 | t-ishii | EUC_JP
test | t-ishii | EUC_JP
unicode | t-ishii | UNICODE
(9 rows)
3. eݻPݽsX۰ഫ
[: eݪxȤݪ{, iO psql ROĶ, αĥ libpq C
{, Perl {, Ϊ̬OzL ODBC ε{. ӫݴNO PostgreSQL
ƮwA{]
PostgreSQL 䴩YǽsXbeݻPݶ۰ഫ: [: o̩ҿת۰
ഫOAbeݤΫݩҫŧiĥΪsXP, un PostgreSQL 䴩o
ؽsXഫ, |Abseഫ]
encoding of backend available encoding of frontend
--------------------------------------------------------------------
EUC_JP EUC_JP, SJIS
EUC_TW EUC_TW, BIG5
LATIN2 LATIN2, WIN1250
LATIN5 LATIN5, WIN, ALT
MULE_INTERNAL EUC_JP, SJIS, EUC_KR, EUC_CN,
EUC_TW, BIG5, LATIN1 to LATIN5,
WIN, ALT, WIN1250
bҰʦ۰ʽsXഫe, AiD PostgreSQL AnbeݱĥΦؽsX.
nXӤkiHFoӥت:
o b psql ROĶϥ \encoding oөRO
\encoding oөROiHAWeݽsX, Ҧp, AnNeݽsX SJIS,
Х:
\encoding SJIS
o ϥ libpq [: PostgreSQL Ʈw C API {w] 禡
psql \encoding ROuOhIs PQsetClientEncoding() oӨ禡ӹFت.
int PQsetClientEncoding(PGconn *conn, const char *encoding)
W conn oӰѼƥN@ӹݪsu, encoding oӰѼƭnAQΪsX,
p\a]wFsX, K|Ǧ^ 0 , ѪܶǦ^ -1. ܩثesusXi
QΥHU禡d:
int PQclientEncoding(const PGconn *conn)
o̭n`NO: oӨ禡Ǧ^OsXN (encoding id, OӾƭ),
ӤOsXW٦r (p "EUC_JP"), pGAnѽsXNosXW,
Is:
char *pg_encoding_to_char(int encoding_id)
o ϥ PGCLIENTENCODING oܼ
pGeݩ]wF PGCLIENTENCODING o@ܼ, ݷ|sX۰ഫ.
[] PostgreSQL 7.0.0 ~ 7.0.3 bug -- {oܼ
o ϥ SET CLIENT_ENCODING TO o SQL RO
n]weݪsXiHΥHUo SQL RO:
SET CLIENT_ENCODING TO 'encoding';
A]iHϥ SQL92 yk "SET NAMES" FP˪ت:
SET NAMES 'encoding';
dߥثeeݽsXiHΥHUo SQL RO:
SHOW CLIENT_ENCODING;
ӹw]sX, ΥHUo SQL RO:
RESET CLIENT_ENCODING;
[] ϥ psql ROĶ, ijnγoӤk, Х \encoding
4. Unicode (Τ@X)
Τ@XMLsXഫinb 7.1 ~|{.
5. pGLkഫ|oͤ?
]AbݿܤF EUC_JP oӽsX, eݨϥ LATIN1, (YǤrLkഫ
LATIN1) boӪpU, YӦrYন LATIN1 r, N|QনHU:
(Qi)
6. ѦҸ
These are good sources to start learning various kind of encoding
systems.
ftp://ftp.ora.com/pub/examples/nutshell/ujip/doc/cjk.inf
Detailed explanations of EUC_JP, EUC_CN, EUC_KR, EUC_TW
appear in section 3.2.
Unicode: http://www.unicode.org/
The homepage of UNICODE.
RFC 3629
UTF-8 is defined here.
5. History
May 20, 2000
* SJIS UDC (NEC selection IBM kanji) support contributed
by Eiji Tokuya
* Changes above will appear in 7.0.1
Mar 22, 2000
* Add new libpq functions PQsetClientEncoding, PQclientEncoding
* ./configure --with-mb=EUC_JP
now deprecated. use
./configure --enable-multibyte=EUC_JP
instead
* Add SQL_ASCII regression test case
* Add SJIS User Defined Character (UDC) support
* All of above will appear in 7.0
July 11, 1999
* Add support for WIN1250 (Windows Czech) as a client encoding
(contributed by Pavel Behal)
* fix some compiler warnings (contributed by Tomoaki Nishiyama)
Mar 23, 1999
* Add support for KOI8(KOI8-R), WIN(CP1251), ALT(CP866)
(thanks Oleg Broytmann for testing)
* Fix problem with MB and locale
Jan 26, 1999
* Add support for Big5 for fronend encoding
(you need to create a database with EUC_TW to use Big5)
* Add regression test case for EUC_TW
(contributed by Jonah Kuo <jonahkuo@mail.ttn.com.tw>)
Dec 15, 1998
* Bugs related to SQL_ASCII support fixed
Nov 5, 1998
* 6.4 release. In this version, pg_database has "encoding"
column that represents the database encoding
Jul 22, 1998
* determine encoding at initdb/createdb rather than compile time
* support for PGCLIENTENCODING when issuing COPY command
* support for SQL92 syntax "SET NAMES"
* support for LATIN2-5
* add UNICODE regression test case
* new test suite for MB
* clean up source files
Jun 5, 1998
* add support for the encoding translation between the backend
and the frontend
* new command SET CLIENT_ENCODING etc. added
* add support for LATIN1 character set
* enhance 8 bit cleaness
April 21, 1998 some enhancements/fixes
* character_length(), position(), substring() are now aware of
multi-byte characters
* add octet_length()
* add --with-mb option to configure
* new regression tests for EUC_KR
(contributed by "Soonmyung. Hong" <hong@lunaris.hanmesoft.co.kr>)
* add some test cases to the EUC_JP regression test
* fix problem in regress/regress.sh in case of System V
* fix toupper(), tolower() to handle 8bit chars
Mar 25, 1998 MB PL2 is incorporated into PostgreSQL 6.3.1
Mar 10, 1998 PL2 released
* add regression test for EUC_JP, EUC_CN and MULE_INTERNAL
* add an English document (this file)
* fix problems concerning 8-bit single byte characters
Mar 1, 1998 PL1 released
Appendix:
[Here is a good documentation explaining how to use WIN1250 on
Windows/ODBC from Pavel Behal. Please note that Installation step 1)
is not necceary in 6.5.1 -- Tatsuo]
Version: 0.91 for PgSQL 6.5
Author: Pavel Behal
Revised by: Tatsuo Ishii
Email: behal@opf.slu.cz
Licence: The Same as PostgreSQL
Sorry for my Eglish and C code, I'm not native :-)
!!!!!!!!!!!!!!!!!!!!!!!!! NO WARRANTY !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Instalation:
------------
1) Change three affected files in source directories
(I don't have time to create proper patch diffs, I don't know how)
2) Compile with enabled locale and multibyte set to LATIN2
3) Setup properly your instalation, do not forget to create locale
variables in your profile (environment). Ex. (may not be exactly true):
LC_ALL=cs_CZ.ISO8859-2
LC_COLLATE=cs_CZ.ISO8859-2
LC_CTYPE=cs_CZ.ISO8859-2
LC_MONETARY=cs_CZ.ISO8859-2
LC_NUMERIC=cs_CZ.ISO8859-2
LC_TIME=cs_CZ.ISO8859-2
4) You have to start the postmaster with locales set!
5) Try it with Czech language, it have to sort
5) Install ODBC driver for PgSQL into your M$ Windows
6) Setup properly your data source. Include this line in your ODBC
configuration dialog in field "Connect Settings:" :
SET CLIENT_ENCODING = 'WIN1250';
7) Now try it again, but in Windows with ODBC.
Description:
------------
- Depends on proper system locales, tested with RH6.0 and Slackware 3.6,
with cs_CZ.iso8859-2 loacle
- Never try to set-up server multibyte database encoding to WIN1250,
always use LATIN2 instead. There is not WIN1250 locale in Unix
- WIN1250 encoding is useable only for M$W ODBC clients. The characters are
on thy fly re-coded, to be displayed and stored back properly
Important:
----------
- it reorders your sort order depending on your LC_... setting, so don't be
confused with regression tests, they don't use locale
- "ch" is corectly sorted only in some newer locales (Ex. RH6.0)
- you have to insert money as '162,50' (with comma in aphostrophes!)
- not tested properly
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