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MySQL Character Encoding Test

2012-02-22 @ Databases, MySQL

Wichtig ist: Wie kamen die Daten in die DB. Wenn mit Latin, kamen die ANSI Chars rein und die UTF8 Kommands werden doppelt Encoded. Dadurch entstehen die A1/4 Zeichen. Wenn die Daten aber mit LATIN1 aus dem Table geholt werden encoded die LOCALES des Systems die Chars:

Mit UTF8 (wie man glauben möchte der richtige)

mysql --default-character-set=UTF8 -e "select id, query from data where query like '%nchen%' limit 1; "
+----+----------------------------------------------------------+
| id | query                                                    |
+----+----------------------------------------------------------+
|  7 | 81539 München, Deutschland                              |
+----+----------------------------------------------------------+

Mit Latin1

mysql --default-character-set=LATIN1 -e "select id, query from data where query like '%nchen%' limit 1; "
+----+-------------------------------------------------------+
| id | query                                                 |
+----+-------------------------------------------------------+
|  7 | 81539 München, Deutschland                            |
+----+-------------------------------------------------------+

Charset Configs

Latin1

[client]
default-character-set = latin1
[mysqld]
default-character-set = latin1
character-set-server = latin1
collation-server = latin1_general_ci
init_connect = 'SET collation_connection = latin1_general_ci'
init_connect = 'SET NAMES latin1'
[mysqldump]
default-character-set = latin1
[mysqlimport]
default-character-set = latin1
[mysql]
default-character-set = latin1

UTF8

[client]
default-character-set = utf8
[mysqld]
default-character-set = utf8
character-set-server = utf8
collation-server = utf8_general_ci
init_connect = 'SET collation_connection = utf8_general_ci'
init_connect = 'SET NAMES utf8'
[mysqldump]
default-character-set = utf8
[mysqlimport]
default-character-set = utf8
[mysql]
default-character-set = utf8

Richtig Dumpen

mysqldump --default-character-set="UTF8" db > db_utf8.sql
mysql --default-character-set="UTF8" db < db_utf8.sql

http://www.gerd-riesselmann.de/softwareentwicklung/php-und-utf-8-eine-anleitung-teil-1-mysql

http://dev.mysql.com/doc/refman/5.1/de/charset-connection.html