二、MySQL数据库操作

1、MySQL数据库

　　查看已经存在的数据库　

1 mysql> show databases;
2 +--------------------+
3 | Database           |
4 +--------------------+
5 | information_schema |
6 | mysql              |
7 | performance_schema |
8 +--------------------+
9 3 rows in set (0.00 sec)

　　创建数据库，再查看数据库

 1 mysql> create database mysqltest;
 2 mysql> show databases;
 3 +--------------------+
 4 | Database           |
 5 +--------------------+
 6 | information_schema |
 7 | mysql              |
 8 | mysqltest          |
 9 | performance_schema |
10 +--------------------+
11 4 rows in set (0.00 sec)
12 
13 mysql> 

　　切换到当前我们刚才所创建的数据库　

mysql> use mysqltest;
Database changed

　　修改数据库

　　修改刚才创建的数据库的默认字符集和校对规则

　　

mysql> alter database mysqltest 
            default character set gb2312     
            default collate gb2312_chinese_ci; 
            Query OK, 1 row affected (0.00 sec)
mysql>                     

　　删除数据库

　　

mysql> drop database if exists mysqltest;
Query OK, 0 rows affected (0.00 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
+--------------------+
3 rows in set (0.01 sec)

mysql>