ÃֽŠ°Ô½Ã±Û(DB)
2017.03.13 / 14:53

MySQL character set È®ÀÎ ¹× º¯°æ

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¾ðÁ¦³ª Çѱ۠±úÁü ¹®Á¦·Î ÀÎÇѠij¸¯ÅÍ ¼Â È®ÀΠ¹× º¯°æ ÀÛ¾÷ÀÌ ¸¹´Ù.

ÀÏ´Ü DB¿¡ ÀúÀåµÈ ÇѱÛÀ̠Ŭ¶óÀ̾ðÆ®¿¡¼­ ¾È º¸À̴ °æ¿ì´Â Å¬¶óÀ̾ðÆ®ÀÇ ÀÎÄÚµù °ªÀ» º¯°æÇؼ­ Á¶Ä¡¸¦ ÇÒ ¼ö ÀÖ´Ù.

±×·¯³ª ÀúÀå ´ç½ÃÀÇ ÀÎÄÚµù °ªÀÌ ¼­·Î ´Ù¸¥ ÇѱÛÀÌ µé¾î°¡ ÀÖÀ» °æ¿ì´Â ¾î¶² ÇѱÛÀº Á¤»óÀûÀ¸·Î º¸ÀÌÁö¸¸¾î¶² ÇѱÛÀº ±úÁ®¼­ º¸À̴ °æ¿ì°¡ ¹ß»ýÇÏ°Ô µÈ´Ù.

MySQLÀº ±âº»À¸·Î ¼­¹ö Ä³¸¯ÅÍ ¼ÂÀÌ latin1À¸·Î ¼³Á¤ µÇ¾î À־ DB »ý¼º ½Ã Ä³¸¯ÅÍ ¼Â °ªÀ» ÁöÁ¤ÇØÁÖÁö ¾ÊÀ¸¸é latin1À¸·Î »ý¼ºÀÌ µÈ´Ù.

 

Character set ?

»ç¿ëÇÏ´Â ¾ð¾î¸¦ Ç¥ÇöÇϱâ À§ÇÑ ¹®ÀÚµéÀÇ ÁýÇÕÀ» ÀǹÌÇѱÛÀ» Ç¥ÇöÇϱâ À§ÇÏ¿© »ç¿ëÇϴ ij¸¯ÅÍ ¼Â¿¡´Â ¿©·¯°¡Áö°¡ Á¸Àç ÇÑ´Ù.

Encoding ?

Character SetÀ» ÄÄÇ»ÅÍ°¡ ÀÌÇØÇÒ ¼ö ÀÖ´Â ¹ÙÀÌÆ®¿Í ¸ÅÇÎÇØ ÁÖ´Â °Í.

 

0. »ç¿ëÇÒ ¼ö Àִ ij¸¯ÅÍ ¼Â Á¾·ù È®ÀÎ

 

mysql> show character set ;

+----------+---------------------------------+---------------------+--------+

| Charset  | Description                     | Default collation   | Maxlen |

+----------+---------------------------------+---------------------+--------+

| big5     | Big5 Traditional Chinese        | big5_chinese_ci     |      2 |

| dec8     | DEC West European               | dec8_swedish_ci     |      1 |

| cp850    | DOS West European               | cp850_general_ci    |      1 |

| hp8      | HP West European                | hp8_english_ci      |      1 |

| koi8r    | KOI8-R Relcom Russian           | koi8r_general_ci    |      1 |

latin1   | cp1252 West European            | latin1_swedish_ci   |      1 |

| latin2   | ISO 8859-2 Central European     | latin2_general_ci   |      1 |

| swe7     | 7bit Swedish                    | swe7_swedish_ci     |      1 |

| ascii    | US ASCII                        | ascii_general_ci    |      1 |

| ujis     | EUC-JP Japanese                 | ujis_japanese_ci    |      3 |

| sjis     | Shift-JIS Japanese              | sjis_japanese_ci    |      2 |

| hebrew   | ISO 8859-8 Hebrew               | hebrew_general_ci   |      1 |

| tis620   | TIS620 Thai                     | tis620_thai_ci      |      1 |

euckr    | EUC-KR Korean                   | euckr_korean_ci     |      2 |

| koi8u    | KOI8-U Ukrainian                | koi8u_general_ci    |      1 |

| gb2312   | GB2312 Simplified Chinese       | gb2312_chinese_ci   |      2 |

| greek    | ISO 8859-7 Greek                | greek_general_ci    |      1 |

| cp1250   | Windows Central European        | cp1250_general_ci   |      1 |

| gbk      | GBK Simplified Chinese          | gbk_chinese_ci      |      2 |

| latin5   | ISO 8859-9 Turkish              | latin5_turkish_ci   |      1 |

| armscii8 | ARMSCII-8 Armenian              | armscii8_general_ci |      1 |

utf8     | UTF-8 Unicode                   | utf8_general_ci     |      3 |

| ucs2     | UCS-2 Unicode                   | ucs2_general_ci     |      2 |

| cp866    | DOS Russian                     | cp866_general_ci    |      1 |

| keybcs2  | DOS Kamenicky Czech-Slovak      | keybcs2_general_ci  |      1 |

| macce    | Mac Central European            | macce_general_ci    |      1 |

| macroman | Mac West European               | macroman_general_ci |      1 |

| cp852    | DOS Central European            | cp852_general_ci    |      1 |

| latin7   | ISO 8859-13 Baltic              | latin7_general_ci   |      1 |

| utf8mb4  | UTF-8 Unicode                   | utf8mb4_general_ci  |      4 |

| cp1251   | Windows Cyrillic                | cp1251_general_ci   |      1 |

| utf16    | UTF-16 Unicode                  | utf16_general_ci    |      4 |

| utf16le  | UTF-16LE Unicode                | utf16le_general_ci  |      4 |

| cp1256   | Windows Arabic                  | cp1256_general_ci   |      1 |

| cp1257   | Windows Baltic                  | cp1257_general_ci   |      1 |

| utf32    | UTF-32 Unicode                  | utf32_general_ci    |      4 |

| binary   | Binary pseudo charset           | binary              |      1 |

| geostd8  | GEOSTD8 Georgian                | geostd8_general_ci  |      1 |

| cp932    | SJIS for Windows Japanese       | cp932_japanese_ci   |      2 |

| eucjpms  | UJIS for Windows Japanese       | eucjpms_japanese_ci |      3 |

| gb18030  | China National Standard GB18030 | gb18030_chinese_ci  |      4 |

+----------+---------------------------------+---------------------+--------+

 

mysql> show character set where description like '%Korean%' ;

+---------+---------------+-------------------+--------+

| Charset | Description   | Default collation | Maxlen |

+---------+---------------+-------------------+--------+

| euckr   | EUC-KR Korean | euckr_korean_ci   |      2 |

+---------+---------------+-------------------+--------+

 

 

À§¿¡¼­ º¸¸é Maxlen Ä®·³ÀÌ º¸À̴µ¥ ¿µ¾î ÀÌ¿ÜÀÇ ¾ð¾î¸¦ ÀúÀåÇϱâ À§Çؼ­´Â 2 ÀÌ»óÀÇ °ªÀ» °¡Áø ¾ð¾î ¼ÂÀ» °¡Á®¾ß¸¸ ÇѱÛÀÌ DB¿¡ ÀúÀåÀÌ µÈ´Ù.

euckrÀº ÇѱÛÀ» 2¹ÙÀÌÆ®·Î ÀúÀåÇÏ°í, utf8Àº ÇѱÛÀ» 3¹ÙÀÌÆ®·Î ÀúÀåÇÑ´Ù. (°ø¹éÀ̳ª ¿µ¹®Àº 1¹ÙÀÌÆ®·Î Ã³¸®)

±×·¡¼­ euckrÀº Á¦ÇÑ µÈ Çѱ۸¸ Ç¥ÇöÀÌ °¡´ÉÇÏÁö¸¸Çѱ۠1±ÛÀÚ´ç 2¹ÙÀÌÆ®¸¦ »ç¿ëÇϹǷÎÁ¦ÇѵȠÇѱ۸¸ »ç¿ëÇϴ ȯ°æ¿¡¼­´Â euckrÀ» ¼³Á¤ Çϴ °ÍÀÌ À¯¸®

 

1. °£´ÜÇϰԠij¸¯ÅÍ ¼ÂÀ» È®ÀΠÇϴ ¹æ¹ý

 

mysql> status

--------------

mysql  Ver 14.14 Distrib 5.7.14, for linux-glibc2.5 (x86_64) using  EditLine wrapper

 

Connection id:                3836

Current database:

Current user:                root@localhost

SSL:                        Not in use

Current pager:                stdout

Using outfile:                ''

Using delimiter:        ;

Server version:                5.7.14-enterprise-commercial-advanced MySQL Enterprise Server - Advanced Edition (Commercial)

Protocol version:        10

Connection:                Localhost via UNIX socket

Server characterset:        latin1

Db     characterset:        latin1

Client characterset:        utf8

Conn.  characterset:        utf8

UNIX socket:                /tmp/mysql.sock

Uptime:                        1 hour 11 min 12 sec

 

Threads: 3  Questions: 33930  Slow queries: 0  Opens: 120  Flush tables: 1  Open tables: 113  Queries per second avg: 7.942

 

 

Servere characterset : µ¥ÀÌÅͺ£À̽º »ý¼º ½Ã ±âº» °ªÀ» ÁöÁ¤ÇØ ÁÖÁö ¾ÊÀ» °æ¿ìÀÌ °ªÀ¸·Î µ¥ÀÌÅÍ º£À̽º Ä³¸¯ÅÍ ¼ÂÀÌ ¼³Á¤ µÊ.

DB      characterset : Å×ÀÌºí »ý¼º ½Ã ±âº» °ªÀ» ÁöÁ¤ÇØ ÁÖÁö ¾ÊÀ» °æ¿ìÀÌ °ªÀ¸·Î Å×À̺íÀǠij¸¯ÅÍ ¼ÂÀÌ ¼³Á¤ µÊ.

Client  characterset : Å¬¶óÀ̾ðÆ® ÀÎÄÚµù ¼³Á¤ °ª.

 

 

2. µ¥ÀÌÅÍ º£À̽ºÀÇ µðÆúÆ® Ä³¸¯ÅÍ ¼Â ¼³Á¤

 

»ý¼º ½Ã ¼³Á¤ÇØ Áִ ¹æ¹ý

CREATE DATABASE `utf8dbDEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci ;

CREATE DATABASE `euekrdbDEFAULT CHARACTER SET euckr COLLATE euckr_korean_ci ;

 

Alter ¸í·ÉÀ¸·Î º¯°æ Çϴ ¹æ¹ý

ALTER  DATABASE  db¸í DEFAULT CHARACTER SET utf8 ;

 

µ¥ÀÌÅͺ£À̽º Ä³¸¯ÅÍ ¼Â È®ÀÎ

SELECT schema_name , default_character_set_name

FROM information_schema.schemata ;

 

schema_name        |default_character_set_name |

-------------------|---------------------------|

information_schema |utf8                       |

euekrdb            |euckr                      |

mysql              |latin1                     |

performance_schema |utf8                       |

sys                |utf8                       |

test               |latin1                     |

utf8db             |utf8                       |

 

Å×À̺íÀǠij¸¯ÅÍ ¼Â ¼³Á¤ ¹× È®ÀÎ

CREATE TABLE Å×À̺í¸í (id int , name varchar(10)) DEFAULT CHARSET=utf8 ;

 

SELECT table_schema , table_name , table_collation

FROM information_schema.tables

WHERE table_schema = 'information_schema' AND table_name = 'PROCESSLIST'

 

table_schema       |table_name  |table_collation |

-------------------|------------|----------------|

information_schema |PROCESSLIST |utf8_general_ci | 

 

 

3. ¼¼¼Ç·¹º§¿¡¼­ ÀÎÄÚµù °ª º¯°æ

 

ÀÓ½ÃÀûÀΠº¯°æ

 

set names Äɸ¯Åͼ ;

 

mysql> status

--------------

mysql  Ver 14.14 Distrib 5.7.14, for linux-glibc2.5 (x86_64) using  EditLine wrapper

 

Connection id:                3836

Current database:

Current user:                root@localhost

SSL:                        Not in use

Current pager:                stdout

Using outfile:                ''

Using delimiter:        ;

Server version:                5.7.14-enterprise-commercial-advanced MySQL Enterprise Server - Advanced Edition (Commercial)

Protocol version:        10

Connection:                Localhost via UNIX socket

Server characterset:        latin1

Db     characterset:        latin1

Client characterset:        utf8

Conn.  characterset:        utf8

UNIX socket:                /tmp/mysql.sock

Uptime:                        1 hour 11 min 12 sec

 

Threads: 3  Questions: 33930  Slow queries: 0  Opens: 120  Flush tables: 1  Open tables: 113  Queries per second avg: 7.942

--------------

 

mysql> set names latin1 ;

Query OK, 0 rows affected (0.00 sec)

 

mysql> status

--------------

mysql  Ver 14.14 Distrib 5.7.14, for linux-glibc2.5 (x86_64) using  EditLine wrapper

 

Connection id:                3836

Current database:

Current user:                root@localhost

SSL:                        Not in use

Current pager:                stdout

Using outfile:                ''

Using delimiter:        ;

Server version:                5.7.14-enterprise-commercial-advanced MySQL Enterprise Server - Advanced Edition (Commercial)

Protocol version:        10

Connection:                Localhost via UNIX socket

Server characterset:        latin1

Db     characterset:        latin1

Client characterset:        latin1

Conn.  characterset:        latin1

UNIX socket:                /tmp/mysql.sock

Uptime:                        1 hour 20 min 3 sec

 

Threads: 3  Questions: 38153  Slow queries: 0  Opens: 120  Flush tables: 1  Open tables: 113  Queries per second avg: 7.943

--------------

 

mysql> set names utf8 ;

Query OK, 0 rows affected (0.00 sec)

 

mysql> status

--------------

mysql  Ver 14.14 Distrib 5.7.14, for linux-glibc2.5 (x86_64) using  EditLine wrapper

 

Connection id:                3836

Current database:

Current user:                root@localhost

SSL:                        Not in use

Current pager:                stdout

Using outfile:                ''

Using delimiter:        ;

Server version:                5.7.14-enterprise-commercial-advanced MySQL Enterprise Server - Advanced Edition (Commercial)

Protocol version:        10

Connection:                Localhost via UNIX socket

Server characterset:        latin1

Db     characterset:        latin1

Client characterset:        utf8

Conn.  characterset:        utf8

UNIX socket:                /tmp/mysql.sock

Uptime:                        1 hour 25 min 38 sec

 

Threads: 3  Questions: 40805  Slow queries: 0  Opens: 120  Flush tables: 1  Open tables: 113  Queries per second avg: 7.941

--------------

 

 

¿µ±¸ÀûÀΠº¯°æ

 

/etc/my.cnf ÆÄÀÏ¿¡ Ä³¸¯ÅÍ ¼ÂÀ» ¸í½Ã ÈÄ MySQL À砱⵿.

 

¿¹) utf8·Î º¯°æ ½Ã

 

[client]

default-character-set = utf8

 

[mysqld]

skip-character-set-client-handshake

default-character-set = utf8

character-set-server = utf8

collation-server = utf8_general_ci

init-connect = SET NAMES utf8

 

[mysqldump]

default-character-set = utf8

 

[mysql]

default-character-set = utf8

 

 

4. Ä³¸¯ÅÍ ¼Â Å×½ºÆ®

 

Server   characterSet : latin1

Database characterset : euckr

Client   ÀÎÄÚµù °ªÀº º¯°æÇØ °¡¸é¼­ Å×½ºÆ®

 

# Client ÀÎÄÚµù°ªÀ» µ¥ÀÌÅͺ£À̽º Ä³¸¯ÅÍ ¼Â°ú µ¿ÀÏÇÑ °ªÀ¸·Î º¯°æ

mysql> set names euckr ;

mysql> status ;

 

Current database:        euekrdb

Current user:                root@localhost

Server characterset:        latin1

Db     characterset:        euckr

Client characterset:        euckr

Conn.  characterset:        euckr

 

#Å×½ºÆ® Å×ÀÌºí »ý¼º

mysql> create table et1  (id int , name varchar(10)) ;

mysql> create table eet1 (id int , name varchar(10)) DEFAULT CHARSET=euckr  ;

mysql> create table eut1 (id int , name varchar(10)) DEFAULT CHARSET=utf8 ;

mysql> commit ;

mysql> select table_name , table_collation from information_schema.tables where table_name like 'e%1' ;

+------------+-----------------+

| table_name | table_collation |

+------------+-----------------+

| eet1       | euckr_korean_ci |

et1        | euckr_korean_ci |

| eut1       | utf8_general_ci |

+------------+-----------------+

ij¸¯ÅÍ ¼ÂÀ» ¸í½ÃÀûÀ¸·Î ÁöÁ¤ÇØ ÁÖÁö ¾Ê¾Ò´ø et1 Å×À̺íÀº µ¥ÀÌÅͺ£À̽º ±âº» Ä³¸¯ÅÍ ¼ÂÀ¸·Î ¼³Á¤ µÊ.

 

#µ¥ÀÌÅÍ Insert

mysql> insert into et1 values (1 , '11È«11' ) ;

mysql> commit ;

mysql> insert into eet1 values (1 , '11È«11' ) ;

mysql> commit ;

mysql> insert into eut1 values (1 , '11È«11' ) ;

mysql> commit;

 

mysql> select * from et1 ;

+------+--------+

| id   | name   |

+------+--------+

|    1 | 11È«11 |

+------+--------+

 

mysql> select * from eet1 ;

+------+--------+

| id   | name   |

+------+--------+

|    1 | 11È«11 |

+------+--------+

 

 

mysql> select * from eut1 ;

+------+--------+

| id   | name   |

+------+--------+

|    1 | 11È«11 |

+------+--------+

 

# Å¬¶óÀ̾ðÆ® ÀÎÄÚµù º¯°æ

mysql> set names utf8 ;

mysql> status ;

 

Current database:        euekrdb

Server characterset:        latin1

Db     characterset:        euckr

Client characterset:        utf8

Conn.  characterset:        utf8

 

mysql> select * from et1 ;

+------+---------+

| id   | name    |

+------+---------+

|    1 | 11??11  |

+------+---------+

 

mysql> select * from eet1 ;

+------+---------+

| id   | name    |

+------+---------+

|    1 | 11??11  |

+------+---------+

 

mysql> select * from eut1 ;

+------+---------+

| id   | name    |

+------+---------+

|    1 | 11??11  |

+------+---------+

 

# »õ·Î¿î µ¥ÀÌÅÍ Insert

mysql> insert into et1 values (11 , '11È«11' ) ;

ERROR 1366 (HY000): Incorrect string value: '\xC8\xAB11' for column 'name' at row 1

 

mysql> insert into eet1 values (11 , '11È«11' ) ;

ERROR 1366 (HY000): Incorrect string value: '\xC8\xAB11' for column 'name' at row 1

 

mysql> insert into eut1 values (11 , '11È«11' ) ;

mysql> commit;

 

mysql> select * from eut1 ;

+------+---------+

| id   | name    |

+------+---------+

|    1 | 11??11  |

|   11 | 11È«11  |

+------+---------+

 

# ´Ù½Ã Ŭ¶óÀ̾ðÆ® ÀÎÄÚµù º¯°æ

mysql> set names euckr ;

mysql> status ;

 

Current database:        euekrdb

Server characterset:        latin1

Db     characterset:        euckr

Client characterset:        euckr

Conn.  characterset:        euckr

 

mysql> select * from eut1 ;

+------+--------+

| id   | name   |

+------+--------+

|    1 | 11È«11 |

|   11 | 11?11  |

+------+--------+

 

 

Server   characterSet : latin1

Database characterset : utf8

Client  ÀÎÄÚµù °ªÀº º¯°æÇØ °¡¸é¼­ Å×½ºÆ®

 

# Client ÀÎÄÚµù°ªÀ» µ¥ÀÌÅͺ£À̽º Ä³¸¯ÅÍ ¼Â°ú µ¿ÀÏÇÑ °ªÀ¸·Î º¯°æ

mysql> set names utf8;

mysql> status

 

Current database:        utf8db

Server characterset:        latin1

Db     characterset:        utf8

Client characterset:        utf8

Conn.  characterset:        utf8

 

#Å×½ºÆ® Å×ÀÌºí »ý¼º

mysql> create table ut1  (id int , name varchar(10)) ;

mysql> create table uet1 (id int , name varchar(10)) DEFAULT CHARSET=euckr  ;

mysql> create table uut1 (id int , name varchar(10)) DEFAULT CHARSET=utf8 ;

mysql> commit ;

mysql> select table_name , table_collation from information_schema.tables where table_name like 'u%1' ;

+------------+-----------------+

| table_name | table_collation |

+------------+-----------------+

| uet1       | euckr_korean_ci |

ut1        | utf8_general_ci |

| uut1       | utf8_general_ci |

+------------+-----------------+

 

#µ¥ÀÌÅÍ Insert

mysql> insert into ut1 values (1 , '11È«11' ) ;

mysql> commit ;

mysql> insert into uet1 values (1 , '11È«11' ) ;

ERROR 1366 (HY000): Incorrect string value: '\xC8\xAB11' for column 'name' at row 1

mysql> insert into uut1 values (1 , '11È«11' ) ;

mysql> commit;

 

mysql> select * from ut1 ;

+------+--------+

| id   | name   |

+------+--------+

|    1 | 11È«11 |

+------+--------+

 

mysql> select * from uet1 ;

Empty set (0.00 sec)

 

mysql> select * from uut1 ;

+------+--------+

| id   | name   |

+------+--------+

|    1 | 11È«11 |

+------+--------+

 

# Å¬¶óÀ̾ðÆ® ÀÎÄÚµù º¯°æ

mysql> set names euckr ;

mysql> status

 

Current database:        utf8db

Server characterset:        latin1

Db     characterset:        utf8

Client characterset:        euckr

Conn.  characterset:        euckr

 

# »õ·Î¿î µ¥ÀÌÅÍ Insert

mysql> insert into ut1 values (11 , '11È«11' ) ;

mysql> commit ;

mysql> insert into uet1 values (11 , '11È«11' ) ;

mysql> commit ;

mysql> insert into uut1 values (11 , '11È«11' ) ;

mysql> commit ;

 

mysql> select * from ut1 ;

+------+--------+

| id   | name   |

+------+--------+

|    1 | 11?11  |

|   11 | 11È«11 |

+------+--------+

 

mysql> select * from uet1 ;

+------+--------+

| id   | name   |

+------+--------+

|   11 | 11È«11 |

+------+--------+

 

mysql> select * from uut1 ;

+------+--------+

| id   | name   |

+------+--------+

|    1 | 11?11  |

|   11 | 11È«11 |

+------+--------+

 

# ´Ù½Ã Ŭ¶óÀ̾ðÆ® ÀÎÄÚµù º¯°æ

mysql> set names utf8 ;

mysql> status

 

Current database:        utf8db

Server characterset:        latin1

Db     characterset:        utf8

Client characterset:        utf8

Conn.  characterset:        utf8

 

mysql> select * from ut1 ;

+------+---------+

| id   | name    |

+------+---------+

|    1 | 11È«11  |

|   11 | 11??11  |

+------+---------+

 

mysql> select * from uet1 ;

+------+---------+

| id   | name    |

+------+---------+

|   11 | 11??11  |

+------+---------+

 

mysql> select * from uet1 ;

+------+---------+

| id   | name    |

+------+---------+

|   11 | 11??11  |

+------+---------+

 

mysql> select * from uut1 ;

+------+---------+

| id   | name    |

+------+---------+

|    1 | 11È«11  |

|   11 | 11??11  |

+------+---------+

 

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