mysqldump with utf8 can not export the right emojis string

问题:

mysql 5.5.29, utf8mb4 charset, there is a table user containing a field nickname with value hex F09F988EF09F988E that is emojis ??.

Now open mysql console, and execute:

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set names utf8mb4;
select nickname, hex(nickname) from user;

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nickname | hex(nickname)
?? | F09F988EF09F988E

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and then execute mysqldump --default-character-set=utf8 -utest -ptest test_dev user > user.sql

check the user.sql and find the nickname display ?? which hex string is 3f

so, how can mysqldump with utf8 export the right emojis string?

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btw, the database charset envionments configured as follow: show variables like 'character_set_%': 'character_set_client', 'utf8mb4' 'character_set_connection', 'utf8mb4' 'character_set_database', 'utf8mb4' 'character_set_filesystem', 'binary' 'character_set_results', 'utf8mb4' 'character_set_server', 'utf8mb4' 'character_set_system', 'utf8' 'character_sets_dir', '/data/mysql/share/charsets/'

回答1:

Thanks Danack!
Thru specifying utf8mb4 charset and upgrading mysqldump version to 5.5.3+, mysqldump & mysql work well for 4 bytes emojis.

[tomcat@localhost ~]$ mysqldump --default-character-set=utf8mb4 -utest -ptest test_dev user > user.sql

If it shows an error like:

mysqldump: Character set 'utf8mb4' is not a compiled character set and is not specified in the '/usr/share/mysql/charsets/Index.xml' file

check your mysqldump version (mysqldump --version)

[tomcat@localhost ~]$ mysqldump --version mysqldump  Ver 10.11 Distrib 5.0.95, for redhat-linux-gnu (x86_64)

It works after upgrading mysqldump to 5.5.33.

[tomcat@localhost ~]$ mysqldump --version mysqldump  Ver 10.13 Distrib 5.5.33, for Linux (x86_64)

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