muzirigel 2019-06-28
utf-8编码可能2个字节、3个字节、4个字节的字符,但是MySQL的utf8编码只支持3字节的数据,而移动端的表情数据是4个字节的字符。如果直接往采用utf-8编码的数据库中插入表情数据,Java程序中将报SQL异常:
java.sql.SQLException: Incorrect string value: ‘\xF0\x9F\x92\x94’ for column ‘name’ at row 1
针对该问题处理最简单的方式是更改数据库的编码为utf8mb4,直接将问题扼杀在摇篮中。
[client] default-character-set = utf8mb4 [mysql] default-character-set = utf8mb4 [mysqld] character-set-client-handshake = FALSE character-set-server = utf8mb4 collation-server = utf8mb4_general_ci init_connect='SET NAMES utf8mb4'
重启数据库。
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 | utf8mb4 |
collation_connection | utf8mb4_general_ci |
collation_database | utf8mb4_general_ci |
collation_server | utf8mb4_general_ci |
ALTER DATABASE `ticketdb` CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci; ALTER TABLE `ticket_description` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci; ALTER TABLE `ticket_description` MODIFY COLUMN `description` text CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL COMMENT '工单描述' AFTER `id`;
如此一来,emoji表情应该不是问题了。