MySql 修改字段的编码类型

utf8mb4 可以设置表情符号。

ALTER TABLE tb_case MODIFY COLUMN content VARCHAR(512) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE tb_case MODIFY COLUMN LAST_CHAT_CONTENT VARCHAR(512) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE tb_chat MODIFY COLUMN content VARCHAR(512) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
ALTER TABLE ofoffline MODIFY COLUMN stanza TEXT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;