MySQL修改默認編碼

首先進入MySQL查看當前默認編碼：

mysql> SHOW VARIABLES LIKE 'character%';
+--------------------------+-----------------------------------------------+
| Variable_name            | Value                                         |
+--------------------------+-----------------------------------------------+
| character_set_client     | latin1                                        |
| character_set_connection | latin1                                        |
| character_set_database   | latin1                                        |
| character_set_filesystem | binary                                        |
| character_set_results    | latin1                                        |
| character_set_server     | latin1                                        |
| character_set_system     | utf8                                          |
| character_sets_dir       | /rdsdbbin/oscar-5.6.10a.16.21/share/charsets/ |
+--------------------------+-----------------------------------------------+
8 rows in set (0.02 sec)

可以看到大部分都是latin1，如今想把默認編碼改爲uft8

能夠直接執行set命令：

SET character_set_client = utf8;
SET character_set_connection = utf8;
SET character_set_database = utf8;
SET character_set_results = utf8;
SET character_set_server = utf8;

而後 mysql> SHOW VARIABLES LIKE 'character%'; 能夠看到全變爲utf8
可是，這只是一種假象。此種方式只在當前狀態下有效，當重啓數據庫服務後失效。

因此想要不出現亂碼只有修改MySQL配置文件my.cnf(windows下my.ini)。
找到配置文件（Linux下通常是/etc/my.cnf）
打開文件，標籤下沒有的要添加，有的就修改：

[client]
default-character-set=utf8
[mysql]
default-character-set=utf8
[mysqld]
default-character-set=utf8

從新鏈接數據庫，再作查詢：

mysql> SHOW VARIABLES LIKE 'character%';
+--------------------------+-----------------------------------------------+
| Variable_name            | Value                                         |
+--------------------------+-----------------------------------------------+
| character_set_client     | utf8                                          |
| character_set_connection | utf8                                          |
| character_set_database   | latin1                                        |
| character_set_filesystem | binary                                        |
| character_set_results    | utf8                                          |
| character_set_server     | latin1                                        |
| character_set_system     | utf8                                          |
| character_sets_dir       | /rdsdbbin/oscar-5.6.10a.16.21/share/charsets/ |
+--------------------------+-----------------------------------------------+