【Mysql】character-set-server参数

对于数据库级的字符集，若是没有办法重建数据库，能够在my.cnf文件中使用character-set-server = utf8(要重启数据库服务)，对于以前已经存在数据库，此参数不产生影响。若是以前的数据库A是latin1，在A中建立的表默认仍是latin1，除非指定DEFAULT CHARSET！然而对于新建的数据库，则继承 my.cnf文件中使用character-set-server = utf8！ [root@rac3 ~]# more /etc/my.cnf [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql old_passwords=1 character-set-server = utf8 关闭数据库服务，并从新启动！ [root@rac3 ~]# mysqladmin shutdown [root@rac3 ~]# mysqld_safe & [1] 15102 [root@rac3 ~]# Starting mysqld daemon with databases from /var/lib/mysql [root@rac3 ~]# mysql Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1 Server version: 5.0.45 Source distribution Type 'help;' or '\h' for help. Type '\c' to clear the buffer. mysql> show variables like '%server%'; +----------------------+-----------------+ | Variable_name | Value | +----------------------+-----------------+ | character_set_server | utf8 | | collation_server | utf8_general_ci | | server_id | 0 | +----------------------+-----------------+ 3 rows in set (0.00 sec) --从新创建数据库，查看其默认字符集：为utf8 mysql> create database yql; Query OK, 1 row affected (0.00 sec) mysql> use yql; Database changed 新建表的默认字符集和数据库的默认字符集一致！ mysql> create table t(id int); Query OK, 0 rows affected (0.00 sec) mysql> show create table t; +-------+-------------------------------------------------------------------------------------+ | Table | Create Table | +-------+-------------------------------------------------------------------------------------+ | t | CREATE TABLE `t` ( `id` int(11) default NULL ) ENGINE=MyISAM DEFAULT CHARSET=utf8 | +-------+-------------------------------------------------------------------------------------+ 1 row in set (0.00 sec) mysql> show create database yql \G; *************************** 1. row *************************** Database: yql Create Database: CREATE DATABASE `yql` /*!40100 DEFAULT CHARACTER SET utf8 */ 1 row in set (0.00 sec) ERROR: No query specified