Linux基礎（day55）
13.4 mysql用戶管理
mysql用戶管理目錄概要
- grant all on . to 'user1' identified by 'passwd';
- grant SELECT,UPDATE,INSERT on db1.* to 'user2'@'192.168.133.1' identified by 'passwd';
- grant all on db1.* to 'user3'@'%' identified by 'passwd';
- show grants;
- show grants for user2@192.168.133.1;
mysql用戶管理
- 場景，爲了安全，新建的站點，建立新的用戶，或者給予使用已有帳戶，給予權限
- grant all on . to 'user1' identified by 'passwd';
- grant 表示 受權
- all 表示全部權限，查看，建立，刪除等等
- on . to 'user1' identified by 'passwd';
- 如果登陸到mysql中後，輸錯了字符，並按了回車鍵，直接輸入分號 ; 就會推出， 回到mysql的命令行
- 退出mysql除了使用 quit 命令，還可使用 exit 命令，還能夠ctrl+d快捷鍵退出
- 登陸到mysql
[root@hf-01 ~]# mysql -uroot -p'hanfeng' Warning: Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 1 Server version: 5.6.35 MySQL Community Server (GPL) Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql>
- 建立普通用戶user1，命令
- 命令grant all on . to 'user1'@'127.0.0.1' identified by '123456a';——>在輸入命令的時候，千萬要注意符號，一旦漏失了符號 ' '，那麼後面就沒法登陸到user1的mysql
- 'user1'@'127.0.0.1' 指定用戶@指定來源IP （指定用戶能夠寫 % 就是通配，表示全部的IP）若是指定了來源IP，那麼只能經過來源IP登陸
- 符號*.* 表示全部庫，全部表
- 第一個 * 表示庫名，能夠寫成mysql.* 那就表示對mysql全部的表
- identified by 'passwd' 指定user1的mysql密碼
- grant語句，是不會記錄到命令歷史中的由於不安全
mysql> grant all on *.* to 'user1'@'127.0.0.1' identified by '123456a'; Query OK, 0 rows affected (0.02 sec) mysql>
- 退出數據庫，並嘗試user1是否能夠登陸
[root@hf-01 ~]# mysql -uuser1 -p'123456a' Warning: Using a password on the command line interface can be insecure. ERROR 1045 (28000): Access denied for user 'user1'@'localhost' (using password: YES) [root@hf-01 ~]#
- 會看到登陸失敗，由於它默認的是sock，須要指定 -h 指定IP，會看到成功登陸到user1的數據庫
[root@hf-01 ~]# mysql -uuser1 -p123456a -h127.0.0.1 Warning: Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 13 Server version: 5.6.35 MySQL Community Server (GPL) Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> quit Bye
- 受權localhost，受權本地，用sock去鏈接
- 從新登陸root，並輸入localhost，建立成功後，並退出
- grant all on . to 'user1'@'localhost' identified by '123456a';
[root@hf-01 ~]# mysql -uroot -p'hanfeng' Warning: Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 14 Server version: 5.6.35 MySQL Community Server (GPL) Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> grant all on *.* to 'user1'@'localhost' identified by '123456a'; Query OK, 0 rows affected (0.00 sec) mysql> quit Bye [root@hf-01 ~]#
- 這時不加-h 也能夠登陸到user1了，由於如今受權就是針對localhost，localhost就是針對的sock
[root@hf-01 ~]# mysql -uuser1 -p123456a Warning: Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 15 Server version: 5.6.35 MySQL Community Server (GPL) Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> exit Bye
- 退出數據庫除了用 quit 命令，還能夠用 exit 命令，還能夠ctrl+d快捷鍵退出
針對具體的權限去受權
- grant SELECT,UPDATE,INSERT on db1.* to 'user2'@'192.168.133.1' identified by 'passwd';
- 針對SELECT,UPDATE,INSERT，針對 db1這個庫全部的表給用戶user2來源IP，並設定密碼
- grant all on db1.* to 'user3'@'%' identified by 'passwd';
- 針對全部的IP去受權
- show grants; 查看全部的受權
- 在登陸到某一用戶下，show grants;會查看到當前用戶的權限的
- 登陸user1用戶的mysql，去查看受權
[root@hf-01 ~]# mysql -uuser1 -p123456a Warning: Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 16 Server version: 5.6.35 MySQL Community Server (GPL) Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> show grants; +-----------------------------------------------------------------------------------------------------------------------+ | Grants for user1@localhost | +-----------------------------------------------------------------------------------------------------------------------+ | GRANT ALL PRIVILEGES ON *.* TO 'user1'@'localhost' IDENTIFIED BY PASSWORD '*B012E8731FF1DF44F3D8B26837708985278C3CED' | +-----------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec) mysql>
- show grants for user1@127.0.0.1; 指定用戶去查看受權
- 登陸root用戶的mysql，而後查看user1用戶的mysql的受權
[root@hf-01 ~]# mysql -uroot -p'hanfeng' Warning: Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 17 Server version: 5.6.35 MySQL Community Server (GPL) Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql> show grants for user1@'127.0.0.1'; +-----------------------------------------------------------------------------------------------------------------------+ | Grants for user1@127.0.0.1 | +-----------------------------------------------------------------------------------------------------------------------+ | GRANT ALL PRIVILEGES ON *.* TO 'user1'@'127.0.0.1' IDENTIFIED BY PASSWORD '*B012E8731FF1DF44F3D8B26837708985278C3CED' | +-----------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec) mysql>
show grants;需求
- show grants；看的是root
- 建立一個用戶user2，並作一個受權
- grant SELECT,UPDATE,INSERT on db1.* to 'user2'@'192.168.133.1' identified by 'passwd';
mysql> grant SELECT,UPDATE,INSERT on db1.* to 'user2'@'192.168.133.1' identified by 'passwd'; Query OK, 0 rows affected (0.01 sec) mysql>
- 查看user2的受權
- show grants for user2@'192.168.133.1';
mysql> show grants for user2@'192.168.133.1'; +------------------------------------------------------------------------------------------------------------------+ | Grants for user2@192.168.133.1 | +------------------------------------------------------------------------------------------------------------------+ | GRANT USAGE ON *.* TO 'user2'@'192.168.133.1' IDENTIFIED BY PASSWORD '*59C70DA2F3E3A5BDF46B68F5C8B8F25762BCCEF0' | | GRANT SELECT, INSERT, UPDATE ON `db1`.* TO 'user2'@'192.168.133.1' | +------------------------------------------------------------------------------------------------------------------+ 2 rows in set (0.00 sec) mysql>
- 有一種狀況會用到它，好比說，給192.168.133.1作了受權了，但發現一個IP不夠，還有一個192.168.133.2，也就是說user2用戶不只須要在192.168.133.1上登陸，還須要在192.168.133.2上登陸，這時候就須要把受權的命令所有在執行一遍
- 這時候就能夠直接把GRANT USAGE ON . TO 'user2'@'192.168.133.1' IDENTIFIED BY PASSWORD '*59C70DA2F3E3A5BDF46B68F5C8B8F25762BCCEF0' 複製一遍，將其中192.168.133.1改成192.168.133.2 並在語句結尾加上分號 ;
mysql> GRANT USAGE ON *.* TO 'user2'@'192.168.133.2' IDENTIFIED BY PASSWOORD '*59C70DA2F3E3A5BDF46B68F5C8B8F25762BCCEF0'; Query OK, 0 rows affected (0.00 sec) mysql>
- 而後再將第二行復制GRANT SELECT, INSERT, UPDATE ON
db1.* TO 'user2'@'192.168.133.1' 把IP改成192.168.133.2，並加上分號 ;
mysql> GRANT SELECT, INSERT, UPDATE ON `db1`.* TO 'user2'@'192.168.133.2'; Query OK, 0 rows affected (0.01 sec) mysql>
- 這時候在來查看show grants查看192.168.133.2
mysql> show grants for user2@'192.168.133.2'; +------------------------------------------------------------------------------------------------------------------+ | Grants for user2@192.168.133.2 | +------------------------------------------------------------------------------------------------------------------+ | GRANT USAGE ON *.* TO 'user2'@'192.168.133.2' IDENTIFIED BY PASSWORD '*59C70DA2F3E3A5BDF46B68F5C8B8F25762BCCEF0' | | GRANT SELECT, INSERT, UPDATE ON `db1`.* TO 'user2'@'192.168.133.2' | +------------------------------------------------------------------------------------------------------------------+ 2 rows in set (0.00 sec) mysql>
- show grants;會看到一樣的密碼，一樣的用戶，惟一改變的就是IP
- 在知道mysql的用戶名，但不知道密碼，也能夠這樣去受權
13.5 經常使用sql語句
經常使用sql語句目錄概要
- select count(*) from mysql.user;
- select * from mysql.db;
- select db from mysql.db;
- select db,user from mysql.db;
- select * from mysql.db where host like '192.168.%';
- insert into db1.t1 values (1, 'abc');
- update db1.t1 set name='aaa' where id=1;
- truncate table db1.t1;
- drop table db1.t1;
- drop database db1;
經常使用sql語句
- 增刪改查，就是mysql和其餘關係型數據庫經常使用的select語句操做命令
查詢語句
- 首先登陸root下的mysql
[root@hf-01 ~]# mysql -uroot -p'hanfeng' Warning: Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 18 Server version: 5.6.35 MySQL Community Server (GPL) Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql>
- 使用db1庫
mysql> use db1; 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>
- 查看當前庫的全部表show tables;
mysql> show tables; +---------------+ | Tables_in_db1 | +---------------+ | t1 | +---------------+ 1 row in set (0.00 sec) mysql>
- 查看錶的行數 select count(*) from mysql.user;
- 庫和表中間有個分割符，就是用點 . 分割
mysql> select count(*) from mysql.user; +----------+ | count(*) | +----------+ | 12 | +----------+ 1 row in set (0.01 sec) mysql>
- 就是說user表有12行內容
- 查看全部的內容 select * from mysql.db;（這樣看起來會很亂） ——>能夠在後面加上\G，如select * from mysql.db\G;
- 這裏的 * 表示查看全部內容
mysql> select * from mysql.db/G;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '/G' at line 1
mysql> select * from mysql.db\G;
*************************** 1. row ***************************
Host: %
Db: test
User:
Select_priv: Y
Insert_priv: Y
Update_priv: Y
Delete_priv: Y
Create_priv: Y
Drop_priv: Y
Grant_priv: N
References_priv: Y
Index_priv: Y
Alter_priv: Y
Create_tmp_table_priv: Y
Lock_tables_priv: Y
Create_view_priv: Y
Show_view_priv: Y
Create_routine_priv: Y
Alter_routine_priv: N
Execute_priv: N
Event_priv: Y
Trigger_priv: Y
*************************** 2. row ***************************
等等等，只截取了一部分
- 查看db庫的全部內容 select db from mysql.db; 第一個db是字段
mysql> select db from mysql.db; +---------+ | db | +---------+ | test | | test\_% | | db1 | | db1 | +---------+ 4 rows in set (0.01 sec) mysql>
- 查db字段和user字段 select db,user from mysql.db;
mysql> select db,user from mysql.db; +---------+-------+ | db | user | +---------+-------+ | test | | | test\_% | | | db1 | user2 | | db1 | user2 | +---------+-------+ 4 rows in set (0.00 sec) mysql>
- 模糊查詢 select * from mysql.db where host like '192.168.%';
- like 就是模糊匹配
mysql> select * from mysql.db where host like '192.168.%'\G;
*************************** 1. row ***************************
Host: 192.168.133.1
Db: db1
User: user2
Select_priv: Y
Insert_priv: Y
Update_priv: Y
Delete_priv: N
Create_priv: N
Drop_priv: N
Grant_priv: N
References_priv: N
Index_priv: N
Alter_priv: N
Create_tmp_table_priv: N
Lock_tables_priv: N
Create_view_priv: N
Show_view_priv: N
Create_routine_priv: N
Alter_routine_priv: N
Execute_priv: N
Event_priv: N
Trigger_priv: N
*************************** 2. row ***************************
Host: 192.168.133.2
Db: db1
User: user2
Select_priv: Y
Insert_priv: Y
Update_priv: Y
Delete_priv: N
Create_priv: N
Drop_priv: N
Grant_priv: N
References_priv: N
Index_priv: N
Alter_priv: N
Create_tmp_table_priv: N
Lock_tables_priv: N
Create_view_priv: N
Show_view_priv: N
Create_routine_priv: N
Alter_routine_priv: N
Execute_priv: N
Event_priv: N
Trigger_priv: N
2 rows in set (0.00 sec)
ERROR:
No query specified
mysql>
插入語句
- 查看建立的表
mysql> desc db1.t1; +-------+----------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+----------+------+-----+---------+-------+ | id | int(4) | YES | | NULL | | | name | char(40) | YES | | NULL | | +-------+----------+------+-----+---------+-------+ 2 rows in set (0.01 sec) mysql>
- 查看db1.t1表的內容，會發現爲空
mysql> select * from db1.t1; Empty set (0.00 sec) mysql>
- 插入數據到 insert into db1.t1 values (1, 'abc');
- 插入1, 'abc'到db1.t1表
mysql> insert into db1.t1 values (1, 'abc'); Query OK, 1 row affected (0.02 sec) mysql>
- 再來查詢db1.t1
mysql> select * from db1.t1; +------+------+ | id | name | +------+------+ | 1 | abc | +------+------+ 1 row in set (0.00 sec) mysql>
- 這樣就成功了插入了一條數據，在插入的時候 name 這個字段應該是是一個字符串，字符串須要加上一個單引號 ' ' ，數字能夠不加單引號
mysql> insert into db1.t1 values (1, 234); Query OK, 1 row affected (0.01 sec) mysql> select * from db1.t1; +------+------+ | id | name | +------+------+ | 1 | abc | | 1 | 234 | +------+------+ 2 rows in set (0.00 sec) mysql>
5.這裏沒有作限制，這裏id和name均可以是相同的，同一個字段裏有相同的數字，相同的值 6. 也能夠作一些限制，在插入相同的id的時候，就會衝突html
update操做
- 更改db1.t1表 的字符串爲name 的數據 和 字符串爲id 的數據
- update db1.t1 set name='aaa' where id=1;
mysql> update db1.t1 set name='aaa' where id=1; Query OK, 2 rows affected (0.01 sec) Rows matched: 2 Changed: 2 Warnings: 0 mysql> select * from db1.t1; +------+------+ | id | name | +------+------+ | 1 | aaa | | 1 | aaa | +------+------+ 2 rows in set (0.00 sec) mysql>
delete操做
- 刪除db1.t1表 的數據 和 字符串爲id 的數據
- delete from db1.t1 where id=1;
mysql> delete from db1.t1 where id=1; Query OK, 2 rows affected (0.01 sec) mysql> select * from db1.t1; Empty set (0.00 sec) mysql>
truncate清空一個表
- 清空表數據 truncate table db1.t1;
- 即便表的數據清空了，但表的字段依舊存在的
mysql> insert into db1.t1 values (1, 234); Query OK, 1 row affected (0.00 sec) mysql> select * from db1.t1; +------+------+ | id | name | +------+------+ | 1 | 234 | +------+------+ 1 row in set (0.00 sec) mysql> truncate table db1.t1; Query OK, 0 rows affected (0.02 sec) mysql> select * from db1.t1; Empty set (0.00 sec) mysql> desc db1.t1; +-------+----------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+----------+------+-----+---------+-------+ | id | int(4) | YES | | NULL | | | name | char(40) | YES | | NULL | | +-------+----------+------+-----+---------+-------+ 2 rows in set (0.00 sec) mysql>
- truncate 只是清空的內容，而drop 會清空表的數據並清除表的框架
- drop 會把表的框架也丟掉 drop table db1.t1;
mysql> drop table db1.t1; Query OK, 0 rows affected (0.01 sec) mysql> select * from db1.t1; //由於表的架構已經不存在了 ERROR 1146 (42S02): Table 'db1.t1' doesn't exist mysql>
- 丟掉表 drop database db1;
總結
- 在使用mysql的時候，少用 * 這樣的操做，由於如果一個表裏面的內容不少，select count(*)這樣操做就會很耗時，浪費資源
- 數據庫中經常使用引擎是myisam和innodb，默認mysql庫裏面都是使用的myisam引擎
- 特色：myisam引擎，能自動去統計有多少行
- 在select count(*)查看錶的時候會很快
- use mysql;
- show create table user\G;
- 特色：innodb引擎，不會自動統計行數，每次去查詢，每次去統計行數，就會很耗時
- use db1
- show create table t1;
- 因此select count(*)這種操做盡可能減小，會耗費太多資源
- 特色：myisam引擎，能自動去統計有多少行
13.6 mysql數據庫備份恢復
mysql數據庫備份恢復目錄概要
- 備份庫 mysqldump -uroot -p123456 mysql > /tmp/mysql.sql
- 恢復庫 mysql -uroot -p123456 mysql < /tmp/mysql.sql
- 恢復是，必須保證目錄一致
- 備份表 mysqldump -uroot -p123456 mysql user > /tmp/user.sql
- 恢復表 mysql -uroot -p123456 mysql < /tmp/user.sql
- 備份全部庫 mysqldump -uroot -p -A >/tmp/123.sql
- 只備份表結構 mysqldump -uroot -p123456 -d mysql > /tmp/mysql.sql
mysql數據庫備份恢復
備份庫
- 在執行mysqldump -uroot -p123456 mysql的時候會看到不少信息，屏幕上顯示的這些就是備份的數據
- 備份mysql庫文件
- mysqlbak.sql文件就是mysql的備份庫文件
[root@hf-01 ~]# mysqldump -uroot -p'hanfeng' mysql > /tmp/mysqlbak.sql Warning: Using a password on the command line interface can be insecure. [root@hf-01 ~]#
- 咱們能夠經過mysqlbak.sql來恢復數據庫，還能夠恢復到另一個數據庫裏面去
- 建立一個新的庫mysql2
[root@hf-01 ~]# mysql -uroot -p'hanfeng' -e "create database mysql2" Warning: Using a password on the command line interface can be insecure. [root@hf-01 ~]#
- 恢復庫
- mysql -uroot -phanfeng mysql < /tmp/mysql.sql
[root@hf-01 ~]# mysql -uroot -p'hanfeng' mysql < /tmp/mysqlbak.sql Warning: Using a password on the command line interface can be insecure. [root@hf-01 ~]#
- 進入到數據庫裏面，在後面加一個mysql2 就會進入到mysql2數據庫裏面
- mysql -uroot -p'hanfeng' mysql2
[root@hf-01 ~]# mysql -uroot -p'hanfeng' mysql2 Warning: Using a password on the command line interface can be insecure. Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 6 Server version: 5.6.35 MySQL Community Server (GPL) Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql>
- 查看數據庫
mysql> select database(); +------------+ | database() | +------------+ | mysql2 | +------------+ 1 row in set (0.00 sec) mysql>
備份表
- 針對庫裏面的某一個表去作備份，只須要在 庫後面 加上 表名字 便可備份
- 先庫 在表，中間是空格
- 備份表 mysqldump -uroot -p123456 mysql user > /tmp/user.sql
- 能看到備份的時候，庫存在的話，先把庫drop掉，而後建立庫，表存在的話，先把表drop掉，而後建立表，而後在一步一步的插入每一行數據
[root@hf-01 ~]# mysqldump -uroot -phanfeng mysql user > /tmp/user.sql Warning: Using a password on the command line interface can be insecure. [root@hf-01 ~]# less /tmp/user.sql 查看備份表
- 恢復表的時候，只須要寫庫的名字，不須要去寫表的名字
- 恢復表 mysql -uroot -p123456 mysql < /tmp/user.sql
- 恢復mysql2庫裏面的表
[root@hf-01 ~]# mysql -uroot -phanfeng mysql2 < /tmp/user.sql Warning: Using a password on the command line interface can be insecure. [root@hf-01 ~]#
備份全部的庫
- 備份全部庫 mysqldump -uroot -phanfeng -A >/tmp/123.sql
- -A 表示all全部的意思
[root@hf-01 ~]# mysqldump -uroot -phanfeng -A > /tmp/mysql_all.sql Warning: Using a password on the command line interface can be insecure. [root@hf-01 ~]# [root@hf-01 ~]# less /tmp/mysql_all.sql
- 只備份表結構 mysqldump -uroot -phanfeng -d mysql > /tmp/mysql.sql
- 不須要表的數據，只須要表的語句
- 備份mysql2的表結構
[root@hf-01 ~]# mysqldump -uroot -phanfeng -d mysql2 > /tmp/mysql.sql Warning: Using a password on the command line interface can be insecure. [root@hf-01 ~]# [root@hf-01 ~]# less /tmp/mysql.sql
示例
- 兩個機器的庫備份，一個庫備份到另外一臺機器上
- 解決：
- 首先兩臺機器可以通訊
- 而後mysqldump -h 遠程mysql-ip -uuser-ppassword dbname > /本地backup.sql
- 這樣既可備份
擴展
-
SQL語句教程mysql
-
mysql字符集調整centos
- 使用xtrabackup備份innodb引擎的數據庫 innobackupex 備份 Xtrabackup 增量備份
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