操作MySQL數(shù)據(jù)庫的高級方法

下文主要給大家?guī)聿僮?a title="MySQL" target="_blank" href="http://www.kemok4.com/mysql/">MySQL數(shù)據(jù)庫的高級方法，希望這些內(nèi)容能夠帶給大家實際用處，這也是我編輯操作MySQL數(shù)據(jù)庫的高級方法這篇文章的主要目的。好了，廢話不多說，大家直接看下文吧。

1.數(shù)據(jù)備份與還原

（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(shù)據(jù)庫的表和記錄，不能恢復數(shù)據(jù)庫本身

    mysql:方法一
              mysql -u username -p password [dbname] < filename.sql

mysql：方法二，source命令
在MySQL命令提示符下：創(chuàng)建數(shù)據(jù)庫 進入數(shù)據(jù)庫 source xxx.sql 文件 將備份的sql文件在當前位置執(zhí)行
source filename.sql   //路徑

2.user表

3.創(chuàng)建普通用戶

（1）使用GRANT語句創(chuàng)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;  #由于直接對user表執(zhí)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(shù)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(shù)count。
（3）MAX_UPDATES_PER_HOUR count：設置每小時最多可執(zhí)行多少次更新
（4）MAX_CONNECTIONS_PER_HOUR count：設置每小時最大連接數(shù)量
（5）MAX_USER_CONNECTIONS：設置每個用戶最多可以同時建立連接數(shù)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' ]....

對于以上關于操作MySQL數(shù)據(jù)庫的高級方法，大家是不是覺得非常有幫助。如果需要了解更多內(nèi)容，請繼續(xù)關注我們的行業(yè)資訊，相信你會喜歡上這些內(nèi)容的。