字符集utf8mb4html
utf8mb4兼容utf8,且比utf8能表示更多的字符。
看unicode編碼區
從1 ~ 126就屬於傳統utf8區,固然utf8mb4也兼容這個區,126行如下就是utf8mb4擴充區,何時你須要存儲那些字符,你才用utf8mb4,不然只是浪費空間。mysql
官方地址:http://dev.mysql.com/doc/refman/5.5/en/charset-unicode-utf8mb4.htmlsql
MySQL 要存儲emoji表情,所以發現咱們經常使用的utf8 字符集根本沒法存儲表情。數據庫
首先將咱們數據庫默認字符集由utf8 更改成utf8mb4,對應的表默認字符集也更改成utf8mb4 已經存儲表情的字段默認字符集也作了相應的調整。bash
SQL 語句測試
# 修改數據庫: ALTER DATABASE database_name CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci; # 修改表: ALTER TABLE table_name CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci; # 修改表字段: ALTER TABLE table_name MODIFY COLUMN column_name VARCHAR(191) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
修改MySQL配置文件編碼
新增以下參數:.net
[client] default-character-set = utf8mb4 [mysql] default-character-set = utf8mb4 [mysqld] character-set-client-handshake = FALSE character-set-server = utf8mb4 collation-server = utf8mb4_unicode_ci init_connect='SET NAMES utf8mb4'//數據庫配置寫的話,這個配置能夠省略
檢查環境變量 和測試 SQL 以下:3d
mysql> 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 | utf8 | | collation_connection | utf8mb4_general_ci | | collation_database | utf8mb4_unicode_ci | | collation_server | utf8mb4_general_ci | +--------------------------+--------------------+ 10 rows in set (0.00 sec)
MySQL版本必須爲5.5.3以上版本,不然不支持字符集utf8mb4code
測試,以下修改亦可
修改數據庫配置
// 數據庫編碼默認採用utf8 'charset' => 'utf8mb4',