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linux修改/etc/my.cnf
win系统修改my.ini文件
注意: 5.1版本在mysqld下设置default-character-set=utf8, 5.5的设置变了, 我使用的环境是mysql 5.5
[client] default-character-set=utf8 [mysqld]character-set-server=utf8init_connect='SET NAMES utf8' [mysql]default-character-set=utf8 修改完成之后, 重启数据库, 可以查看
mysql> \s--------------mysql Ver 14.14 Distrib 5.5.27, for Win32 (x86) Connection id: 33Current database:Current user: root@localhostSSL: Not in useUsing delimiter: ;Server version: 5.5.27 MySQL Community Server (GPL)Protocol version: 10Connection: localhost via TCP/IPServer characterset: utf8Db characterset: utf8Client characterset: utf8Conn. characterset: utf8TCP port: 3306Uptime: 3 min 53 sec Threads: 1 Questions: 282 Slow queries: 0 Opens: 61 Flush tables: 1 Open tables: 54 Queries per second avg: 1.210-------------- 这样保证连接mysql之后, 默认都使用了UTF8编码
也可以查看全局变量
mysql> SHOW VARIABLES LIKE 'character_set_%';+--------------------------+---------------------------------------------+| 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 | XXX\mysql\share\charsets\ |+--------------------------+---------------------------------------------+8 rows in set (0.00 sec)mysql> SHOW VARIABLES LIKE 'collation_%';+----------------------+-----------------+| Variable_name | Value |+----------------------+-----------------+| collation_connection | utf8_general_ci || collation_database | utf8_general_ci || collation_server | utf8_general_ci |+----------------------+-----------------+3 rows in set (0.00 sec) 已经建立的数据库和表需要进行修改和更新, 分别对数据库和表进行, 数据量小可以考虑导出为sql语句后修改
修改数据库, 表和字段的sql语法参考如下
修改数据库, 以test数据库为例
mysql> alter database `test` character set utf8; 修改表为utf8, 以book表为例
mysql> alter table `book` character set utf8; 以book表的title字段为例
mysql> alter table `books_book` modify `title` varchar(100) character set utf8; 其中sql语句中的反引号[`]是用来转义的
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