MySQL utf8mb4 字符集：支持 emoji 表情符号

㈠ 序言

为了应对无线互联网的机遇和挑战、避免 emoji 表情符号带来的问题、
涉及无线相关的 MySQL 数据库建议都提前采用 utf8mb4 字符集
这必须要作为移动互联网行业的一个技术选型的要点

㈡ 限制

需要 >= MySQL 5.5.3版本、从库也必须是5.5的了、低版本不支持这个字符集、复制报错

㈢ 简要步骤

以下是一个未升级到 5.5.3 的配置步骤：

① 备份数据库
② 升级 MySQL Server 到 v5.5.3+
③ 修改 database、table和column字符集

# For each database:ALTER DATABASE database_name CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;
# For each table:ALTER TABLE table_name CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
# For each column:ALTER TABLE table_name CHANGE column_name column_name VARCHAR(191) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
# (Don’t blindly copy-paste this! The exact statement depends on the column type, maximum length, and other properties. The above line is just an example for a `VARCHAR` column.)

④ 修改 my.cnf

[client]  
default-character-set = utf8mb4  

[mysql]  
default-character-set = utf8mb4  

[mysqld]  
character-set-client-handshake = FALSE  
character-set-server = utf8mb4  
collation-server = utf8mb4_unicode_ci  
init_connect='SET NAMES utf8mb4'

⑤ 重启 MySQL Server、检查字符集

mysql> SHOW VARIABLES WHERE Variable_name LIKE 'character\_set\_%' OR Variable_name LIKE 'collation%';  
+--------------------------+--------------------+  
| Variable_name            | Value              |  
+--------------------------+--------------------+  
| 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               |  
| collation_connection     | utf8mb4_unicode_ci |  
| collation_database       | utf8mb4_unicode_ci |  
| collation_server         | utf8mb4_unicode_ci |  
+--------------------------+--------------------+  
rows in set (0.00 sec)

最后编辑：2014-01-17

作者：admin

这个作者貌似有点懒，什么都没有留下。

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