MySQL utf8mb4字符集：支持emoji表情符号_MySQL

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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

[plain]

# 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

[plain]

[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

[plain]

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)

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