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2. µ¼³ö£ºmysqldump -u root -p dbname > file.sql
3. µ¼È룺mysql -u root -p dbname < backup-file.sql
4. ÊÚȨ£ºgrant all on *.* to root@"%" identified by "ÃÜÂë";
5. ÊÕ»ØÈ¨ÏÞ£ºrevoke all privileges on *.* from root@"%";
6. µÇ¼£ºmysql -u root -p
7. ²é¿´Êý¾Ý¿â£ºshow databases;
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9. ²é¿´±í£ºshow tables;


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$sql="select a.id,a.title,b.n from video_info a,(".$sql.")b where a.id=b.video_id order by n desc limit 20";
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