MySQL数据库的自动备份与数据库被破坏后的恢复（3）

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the buffer.

mysql> show databases;　 ← 查看当前存在的数据库 
+-------------+ 
| Database | 
+-------------+ 
| mysql | 
| test　 | 
+------------+ 
2 rows in set (0.00 sec)

mysql> use test　 ← 连接到test数据库 
Reading table information for completion of table and column names 
You can turn off this feature to get a quicker startup with -A

Database changed 
mysql> show tables;　 ← 查看test数据库中存在的表 
+-------------------+ 
| Tables_in_test | 
+-------------------+ 
| test 　| 
+-------------------+ 
1 row in set (0.00 sec)

mysql> select * from test;　 ← 查看数据库中的内容 
+------+--------------------+ 
| num | name　 | 
+------+--------------------+ 
| 1 | Hello,CentOS| 
+------+--------------------+ 
1 row in set (0.01 sec)

mysql> exit　 ← 退出MySQL服务器 
Bye

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the buffer.

mysql> use test　 ← 连接到test数据库 
Reading table information for completion of table and column names 
You can turn off this feature to get a quicker startup with -A

Database changed 
mysql> update test set name=‘Shit,Windows‘;　 ← 然后将test中表的值重新定义为“Shit,Windows”（原来为“Hello,CentOS”） 
Query OK, 1 row affected (0.07 sec) 
Rows matched: 1 Changed: 1 Warnings: 0

mysql> select * from test;　 ← 确认test中的表被定义的值 
+------+--------------------+ 
| num | name 　| 
+------+-------------------+ 
| 1 | Shit,Windows |　 ← 确认已经将原test数据库表中的值修改为新的值“Shit,Windows” 
+------+-------------------+ 
1 row in set (0.00 sec)

mysql> exit　 ← 退出MySQL服务器 
Bye

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the buffer.

mysql> use test　 ← 连接到test数据库 
Reading table information for completion of table and column names 
You can turn off this feature to get a quicker startup with -A

Database changed 
mysql> select * from test;　 ← 查看数据库中的内容 
+------+----------------+ 
| num | name　 | 
+------+----------------+ 
| 1| Hello,CentOS　|　← 确认数据表中的内容与被修改前定义的“Hello,CentOS”一样！ 
+------+----------------+ 
1 row in set (0.01 sec)

mysql> exit　 ← 退出MySQL服务器 
Bye

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the buffer.

mysql> use test　 ← 连接到test数据库 
Reading table information for completion of table and column names 
You can turn off this feature to get a quicker startup with -A

Database changed 
mysql> drop table test;　 ← 删除test数据库中的表 
Query OK, 0 rows affected (0.01 sec)

mysql> drop database test;　 ← 删除测试用数据库test 
Query OK, 0 rows affected (0.00 sec)

mysql> show databases;　 ← 查看当前存在的数据库 
+-------------+ 
| Database | 
+-------------+ 
| mysql |　 ← 确认测试用数据库test不存在、已被删除 
+-------------+ 
1 row in set (0.00 sec)

mysql> exit　 ← 退出MySQL服务器 
Bye