修改編碼爲utf8mb4 以支持emoji表情

環境：

項目db的全部字符集都已經初始化爲utf-8，如 status命令顯示以下：

Server characterset: utf8
Db characterset: utf8
Client characterset: utf8
Conn. characterset: utf8

 

1、修改對應項目數據庫級別字符集：

mysql> show create database yyf;
+----------+--------------------------------------------------------------+
| Database | Create Database |
+----------+--------------------------------------------------------------+
| yyf | CREATE DATABASE `yyf` /*!40100 DEFAULT CHARACTER SET utf8 */ |
+----------+--------------------------------------------------------------+
1 row in set (0.00 sec)

mysql> alter database yyf CHARACTER SET utf8mb4;
Query OK, 1 row affected (0.00 sec)

mysql> show create database yyf;
+----------+-----------------------------------------------------------------+
| Database | Create Database |
+----------+-----------------------------------------------------------------+
| yyf | CREATE DATABASE `yyf` /*!40100 DEFAULT CHARACTER SET utf8mb4 */ |
+----------+-----------------------------------------------------------------+
1 row in set (0.00 sec)

 

2、修改表級別的字符集：

 alter table t1 CHARSET=utf8mb4;

 

3、修改客戶端鏈接數據庫的配置：

 return [
'class' => 'yii\db\Connection',
'driverName' => 'mysql',
'dsn' => 'mysql:host=xxxx;port=3306;dbname=yyf;',
'username' => 'xxxx',
'password' => 'xxxx',
###'charset' => 'utf8',

'charset' => 'utf8mb4', ];