MySQL数据库操作常用命令小结

创建数据库

最简单的方式：

create database  my_db;

或者是：

create database if not exists my_db;

创建utf8编码的数据库：

create database if not exists my_db default character set utf8 collate utf8_general_ci;

那么在这个数据库下创建的所有数据表的默认字符集都会是utf8了，注意后面这句话 "collate utf8_general_ci",大致意思是在排序时根据utf8变码格式来排序。

查看数据库列表：

show databases;

使用数据库：

use my_db;

查看数据库默认编码：

show variables like 'character_set_%'

+--------------------------+-------------------------------------------------------+
| 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/local/mysql-5.5.28-linux2.6-i686/share/charsets/ |
+--------------------------+-------------------------------------------------------+

可以看到character_set_database是lantin1.

修改数据库编码：

alter database my_db character set latin1;

删除数据库：

drop database my_db;

或者是：

drop database if exists my_db;