修改mysql默認字符編碼爲utf8

MySQL的默認編碼是Latin1，不支持中文，要支持中文須要把數據庫的默認編碼修改成gbk或者utf8。
一、修改數據庫字符編碼
mysql> alter database mydb character set utf8 ;
二、建立數據庫時，指定數據庫的字符編碼
mysql> create database mydb character set utf8 ;
三、查看mysql數據庫的字符編碼
mysql> show variables like 'character%'; //查詢當前mysql數據庫的全部屬性的字符編碼
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | latin1                     |
| character_set_connection | latin1                     |
| character_set_database   | utf8                       |
| character_set_filesystem | binary                     |
| character_set_results    | latin1                     |
| character_set_server     | utf8                       |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
四、修改mysql數據庫的字符編碼
修改字符編碼必需要修改mysql的配置文件my.cnf,而後重啓才能生效
一般須要修改my.cnf的以下幾個地方：
【client】下面，加上default-character-set=utf8，或者character_set_client=utf8
【mysqld】下面，加上character_set_server = utf8 ；
由於以上配置，mysql默認是latin1，若是僅僅是經過命令行客戶端，mysql重啓以後就不起做用了。
以下是客戶端命令行修改方式，不推薦使用
mysql> set character_set_client=utf8 ;
mysql> set character_set_connection=utf8 ;
mysql> set character_set_database=utf8 ;
mysql> set character_set_database=utf8 ;
mysql> set character_set_results=utf8 ;
mysql> set character_set_server=utf8 ;
mysql> set character_set_system=utf8 ;
mysql> show variables like 'character%';
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | utf8                       |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | utf8                       |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
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