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数据库配置修改：
[client]
default-character-set = utf8mb4
[mysql]
[mysqld]
character-set-client-handshake = FALSE
character-set-server = utf8mb4
collation-server = utf8mb4_unicode_ci
init_connect='SET NAMES utf8mb4'
修改已有表字符集：
alter table xxx convert to character set utf8mb4;
