MySQL數據庫的高級操作
（1）備份
mysqldump:
mysqldump -u username -p password dbname [tbname1 [tbname2....] ]> filename.sql
mysqldump -u root -p mydb2 > C:\mysql\dump\mydb2_dump.sql（2）恢復：只能恢復數據庫的表和記錄，不能恢復數據庫本身
mysql:方法一
mysql -u username -p password [dbname] < filename.sqlmysql：方法二，source命令
source filename.sql //路徑
2.user表
3.創建普通用戶
（1）使用GRANT語句創建用戶
GRANT privileges ON dtabase.table
TO ‘username‘ @ ‘hostname‘ [IDENTIFIED BY [PASSWORD] ‘password‘] [,‘username‘ @ ‘hostname‘ [IDENTIFIED BY [PASSWORD] ‘password‘]]...............
grant select on mydb2.* to ‘haha‘ @‘localhost‘ identified by ‘123456‘;
//錯誤
（2）使用CREATE語句
CREATE USER ‘username‘@‘hostname‘ [IDENTIFIED BY [PASSWORD] ‘password‘] [,‘username‘ @ ‘hostname‘ [IDENTIFIED BY [PASSWORD] ‘password‘]]...............
create user ‘haha‘@‘localhost‘ identified by ‘123456‘;
(3) 使用INSERT語句
4.刪除普通用戶
~ROP USER ‘username‘@‘hostname‘ [,‘username‘@‘hostname‘];
drop user ‘ha‘@‘localhost‘;
~ELETE FROM mysql.user WHERE Host= ‘hostname‘ AND User = ‘username‘;
delete from mysql.user where host = ‘localhost‘ and user = ‘ha‘;
flush privileges; #由於直接對user表執行操作，要重新加載用戶權限
5.修改用戶密碼
（1）修改root用戶密碼
+++++++++++++++++++++++++++++++++++++++++++++++
UPDATE mysql.user set Password = PASSWORD(‘new_password‘) WHERE User=‘username‘ and Host=‘hostname‘;
FLUSH PRIVILEGES;
update mysql.user set password=PASSWORD(‘QWE123!@#‘) where user=‘root‘ and host=‘localhost‘;
flush privileges;
+++++++++++++++++++++++++++++++++++++++++++++
//不成功
（2）root用戶修改普通用戶密碼
SET PASSWORD FOR ‘username‘@‘hostname‘=PASSWORD(‘new_password‘);
set password for ‘haha‘@‘localhost‘=PASSWORD(‘123‘);
+++++++++++++++++++++++++++++++++++++++
//不成功
（3）普通用戶修改密碼
SET PASSWORD=PASSWORD(‘new_password‘);
6.授予權限：使不同用戶有不同權限
（1）GRANT privileges [ (columns) ] [,privileges[(columns)]] ON database.table TO ‘username‘@‘hostname‘ [IDENTIFIED BY [PASSWORD] ‘password‘ ] [ ‘username‘@‘hostname‘ [IDENTIFIED BY [PASSWORD] ‘password‘ ]]...........
[WITH with_option [with_option]...]
with_option參數如下：
（1）GRANT OPTION：將自己的權限授予其他用戶
（2）MAX_QUERIES_PER_HOUR count：設置每小時最大查詢次數count。
（3）MAX_UPDATES_PER_HOUR count：設置每小時最多可執行多少次更新
（4）MAX_CONNECTIONS_PER_HOUR count：設置每小時最大連接數量
（5）MAX_USER_CONNECTIONS：設置每個用戶最多可以同時建立連接數量
GRANT INSERT,SELECT ON mydb2.star TO ‘haha‘@‘localhost‘ IDENTIFIED BY ‘123456‘
WITH GRANT OPTION;
++++++++++++++++++++++++++++++++++++++++++++
//不成功
7.查看權限
(1) SHOW GRANTS FOR ‘username‘@‘hostname‘;
show grants for ‘haha‘@‘localhost‘;
8.收回權限
REVOKE privileges [ (columns) ] [,privileges[(columns)]] ON database.table FROM ‘username‘@‘hostname‘ [,‘username‘@‘hostname‘ ]....
MySQL數據庫的高級操作