Linux下MySQL_5.5的修改字符集编码为UTF8

内容简介：Linux下MySQL_5.5的修改字符集编码为UTF8

背景

mysql安装后, 插入的数据位乱码, 经检查为默认字符集是 latin1 , 而程序使用 UTF-8 .

检查字符集

1.使用ssh终端连接mysql

mysql -h 127.0.0.1 -u root -p

2.查看字符集

show variables like 'character%';

显示如下

+--------------------------+----------------------------+
| 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 | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+

character_set_database和character_set_server的默认字符集还是latin1.

解决方案

修改 mysql 的 my.cnf 文件中的字符集键值, my.cnf 一般位于 /etc 目录下, 没找到的话可以使用 find / -name my.cnf 查找.

1.在[client]字段里加入default-character-set=utf8

[client]
port = 3306
socket = /var/lib/mysql/mysql.sock
default-character-set=utf8

2.在[mysqld]字段里加入character-set-server=utf8

[mysqld]
port = 3306
socket = /var/lib/mysql/mysql.sock
character-set-server=utf8

3.在[mysql]字段里加入default-character-set=utf8

[mysql]
no-auto-rehash
default-character-set=utf8

修改完成后，service mysql restart重启mysql服务就生效.

注意: [mysqld]字段与[mysql]字段是有区别的.

4.再次查看字符集

show variables like 'character%';

如下所示:

+--------------------------+----------------------------+
| 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/ |
+--------------------------+----------------------------+

5.如果上面的都修改了还乱码,那剩下问题就一定在connection连接层上.

SET NAMES 'utf8';

该语句相当于

SET character_set_client = utf8;
SET character_set_results = utf8;
SET character_set_connection = utf8;

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