刪除庫
mysql> drop database school;
查看數據庫
mysql> show databases;

+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
 

還原數據庫

mysql> source /opt/school.sql

mysql> show databases;   #查看數據庫確認
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| school             |
| sys                |
+--------------------+

方法二：此方法需要重新創建庫名
mysqldump -uroot -pabc123 school > /opt/school.sql  
mysql> create database school;
mysql> source /opt/school.sql;
mysql> show tables;
+------------------+
| Tables_in_school |
+------------------+
| info             |
+------------------+
1 row in set (0.00 sec)

mysql> select * from info;
+----+------+-------+
| id | name | score |
+----+------+-------+
|  1 | ll   |    88 |
|  2 | tl   |    68 |
|  3 | ww   |    44 |
|  4 | pw   |    55 |
+----+------+-------+
 

方法三：不進入mysql數據庫恢復數據
恢復數據
mysql -uroot -pabc123 < /opt/school.sql

數據表備份
[root@localhost ~]# mysqldump -uroot -pabc123 school info > /opt/info.sql

刪除表格（模擬數據表損壞）

mysql> drop table info;

還原備份數據表
mysql> source /opt/info.sql

查看表格

mysql> show tables;
+------------------+
| Tables_in_school |
+------------------+
| info             |
+------------------+
 

與數據庫一樣，也可以不登錄mysql恢復數據表
mysql -uroot -pabc123 school < /opt/info.sql

總結：無論是恢復數據庫還是恢復數據表，都應該先查看一下備份文件，看裏面有無自動創建數據庫或數據表的命令，再考慮是否在備份時創建數據庫和數據表！

查看備份文件
vim school.sql

mysql數據庫命令大全---完全備份和恢復