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;
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或者是：

CREATE DATABASE IF NOT EXISTS my_db;
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创建utf8编码的数据库：

CREATE DATABASE IF NOT EXISTS my_db default character set utf8 COLLATE utf8_general_ci;
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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;
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使用数据库：

use my_db;
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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/ |
+--------------------------+-------------------------------------------------------+
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可以看到character_set_database是lantin1.

修改数据库编码：

alter database my_db character set latin1;
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删除数据库：

drop database my_db;
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或者是：

drop database IF EXISTS my_db;
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