存储emoji表情，修改字符集为utf8mb4

SHOW VARIABLES WHERE Variable_name LIKE 'character_set_%' OR Variable_name LIKE 'collation%';

SET character_set_client = utf8mb4;
SET character_set_connection = utf8mb4;
SET character_set_database = utf8mb4;
SET character_set_results = utf8mb4;
SET character_set_server = utf8mb4;

ALTER DATABASE 数据库名 CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;

ALTER TABLE tableName CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;

ALTER TABLE tableName  CHANGE `content` `content` LONGTEXT CHARACTER SET utf8mb4

另外my.ini（此文件在tomcat安装目录和bin在同级）文件要修改这几处：

[client]

default-character-set = utf8mb4

port=3306

[mysql]

default-character-set = utf8mb4

 

[mysqld]

 

 

character-set-server = utf8mb4

 

 

# The default storage engine that will be used when create new tables when

default-storage-engine=INNODB

# Set the SQL mode to strict

sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"