檢查命令：
mysql> show variables like '%char%';
期望結果：
使用mysql命令設置：
如果仍有編碼不是utf8的，請檢查配置文件，也可使用mysql命令設置：
set character_set_client = utf8;
set character_set_server = utf8;
set character_set_connection = utf8;
set character_set_database = utf8;
set character_set_results = utf8;
set collation_connection = utf8_general_ci;
set collation_database = utf8_general_ci;
set collation_server = utf8_general_ci;