MySQL用戶管理，經常使用SQL語句，MySQL數據庫備份與恢復
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MySQL用戶管理，經常使用SQL語句，MySQL數據庫備份與恢復
擴展 SQL語句教程 http://www.runoob.com/sql/sql-tutorial.html 什麼是事務？事務的特性有哪些？ http://blog.csdn.net/yenange/article/details/7556094 根據binlog恢復指定時間段的數據 http://www.centoscn.com/mysql/2015/0204/4630.html mysql字符集調整 http://xjsunjie.blog.51cto.com/999372/1355013mysql
使用xtrabackup備份innodb引擎的數據庫 innobackupex 備份 Xtrabackup 增量備份 http://zhangguangzhi.top/2017/08/23/innobackex%E5%B7%A5%E5%85%B7%E5%A4%87%E4%BB%BDmysql%E6%95%B0%E6%8D%AE/#%E4%B8%89%E3%80%81%E5%BC%80%E5%A7%8B%E6%81%A2%E5%A4%8Dmysql 相關視頻linux
連接：http://pan.baidu.com/s/1miFpS9M 密碼：86dxsql
1、MySQL用戶管理
1.建立一個普通用戶並受權
首先啓動mysql，而後進入數據庫
[root@xavi ~]# /etc/init.d/mysqld start Starting MySQL... SUCCESS! [root@xavi ~]# mysql -uroot -pxavilinux 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>
all表示全部的權限（如讀、寫、查詢、刪除等操做）；建立user用戶並授予其全部權限*.（第一個表示全部數據庫，第二個*表示全部表） 這裏的user1特指localhost上的user1，用戶和主機的IP之間有一個@符號 identified by ：設定密碼，用單引號括起來。centos
mysql> grant all on *.* to 'user1'@'127.0.0.1' identified by '123456'; Query OK, 0 rows affected (0.00 sec)
另外，命令中主機IP能夠用%替代，表示全部主機
mysql> grant all on *.* to 'user2'@'%' identified by '123456a'; Query OK, 0 rows affected (0.00 sec)
1.1 退出，驗證user1是否能夠直接登入，由於默認是socket的登入模式，沒法登入
mysql> quit Bye [root@xavi ~]# mysql -uuser1 -p123456 Warning: Using a password on the command line interface can be insecure. ERROR 1045 (28000): Access denied for user 'user1'@'localhost' (using password: YES)
1.2 加上主機ip： mysql -uuser1 -p123456 -h127.0.0.1
[root@xavi ~]# mysql -uuser1 -p123456 -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 3 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>
不加-h的方法把127.0.0.1換成localhost（針對的就是socket，localhost就是虛擬機IP地址192.168.72.130），mysql輸入出錯時，輸入；後接着輸quit退出
mysql> grant all on *.* to 'user1'@'localhost' identified by '123456'; Query OK, 0 rows affected (0.00 sec) mysql> quit Bye [root@xavi ~]# mysql -uuser1 -p123456 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 5 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>
查看用戶受權
mysql> show grants //查看當前用戶受權
-> ;
+-----------------------------------------------------------------------------------------------------------------------+
| Grants for user1@localhost |
+-----------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'user1'@'localhost' IDENTIFIED BY PASSWORD '*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9' |
+-----------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
查看指定用戶受權：show grants for user1@'127.0.0.1';
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 '*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9' | +-----------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)
受權部分權限(如讀、寫、查詢、插入等)
這一部分開始操做是一隻報錯app
mysql> grant all on db2.* to 'user2'@'192.168.188.129' identified by '111222'; ERROR 1044 (42000): Access denied for user 'user1'@'localhost' to database 'db2' mysql> grant all on db1.* to 'user3'@'%' identified by 'passwd'; ERROR 1044 (42000): Access denied for user 'user1'@'localhost' to database 'db1' mysql> grant all on db1.* to 'user3'@'%' identified by 'passwd'; ERROR 1044 (42000): Access denied for user 'user1'@'localhost' to database 'db1' mysql> revoke all on *.* from user1@localhost; ERROR 1045 (28000): Access denied for user 'user1'@'localhost' (using password: YES) mysql> revoke all on *.* from 'user1'@'localhost' identified by '123456'; 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 ''123456'' at line 1 mysql> revoke all on *.* from 'user1'@'localhost' identified by '123456'; 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 ''123456'' at line 1 mysql> show grants for user1@'127.0.0.1';
錯誤的緣由是本身一直是在user1的數據庫可裏操做，以前的步驟中進入了「mysql -uuser1 -p123456」這就是陷阱了
正確操做方法是，進入mysql的root用戶下操做
mysql> quit Bye [root@xavi ~]# mysql -uroot -pxavilinux 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 2 Server version: 5.6.35 MySQL Community Server (GPL)
受權部分權限(如讀、寫、查詢、插入等)
mysql> grant SELECT,UPDATE,INSERT on db1.* to 'user2'@'192.168.133.1' identified by 'passwd'; Query OK, 0 rows affected (0.00 sec)
給不一樣IP作同一個用戶的受權，同一密碼
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> GRANT USAGE ON *.* TO 'user2'@'192.168.133.2' IDENTIFIED BY PASSWORD '*59C70DA2F3E3A5BDF46B68F5C8B8F25762BCCEF0'; Query OK, 0 rows affected (0.00 sec) mysql> GRANT SELECT, INSERT, UPDATE ON `db1`.* TO 'user2'@'192.168.133.2'; Query OK, 0 rows affected (0.00 sec)
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)
2、經常使用SQL語句
2.1 查詢語句的兩種形式
select count(*) from mysql.user; //查詢mysql庫中user表的行數
mysql> select count(*) from mysql.user; +----------+ | count(*) | +----------+ | 10 | +----------+ 1 row in set (0.00 sec)
select * from mysql.db\G;//查詢mysql庫中db表的全部內容
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
2.2 select語句在數據庫和表中對應的引擎不同，其計算統計時間也不一樣，不建議多使用
例如mysql下的user的表，用的是MYISAM引擎，會自動統計行數，運行效率快
mysql> use mysql;
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> show create table user\G;
*************************** 1. row ***************************
Table: user
Create Table: CREATE TABLE `user` (
`Host` char(60) COLLATE utf8_bin NOT NULL DEFAULT '',
`User` char(16) COLLATE utf8_bin NOT NULL DEFAULT '',
`Password` char(41) CHARACTER SET latin1 COLLATE latin1_bin NOT NULL DEFAULT '',
`Select_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Insert_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Update_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
`Delete_priv` enum('N','Y') CHARACTER SET utf8 NOT NULL DEFAULT 'N',
.
.
.
PRIMARY KEY (`Host`,`User`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='Users and global privileges'
1 row in set (0.01 sec)
對於db1下的t1表，其引擎是InnoDB，每次select時纔開始統計行，運行效率低。（示例中的表格並未有數據，不能做爲參考）
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> show create table t1; +-------+---------------------------------------------------------------------------------------------------------------------+ | Table | Create Table | +-------+---------------------------------------------------------------------------------------------------------------------+ | t1 | CREATE TABLE `t1` ( `id` int(4) DEFAULT NULL, `name` char(40) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8 | +-------+---------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)
2.3 查詢單個字段或者多個字段
mysql> select db from mysql.db; +---------+ | db | +---------+ | test | | test\_% | | db1 | | db1 | +---------+ 4 rows in set (0.01 sec) mysql> select db,user from mysql.db; +---------+-------+ | db | user | +---------+-------+ | test | | | test\_% | | | db1 | user2 | | db1 | user2 | +---------+-------+ 4 rows in set (0.00 sec)
2.4 使用萬能匹配符%，和like進行模糊匹配查詢
mysql> select * from mysql.db where host like '192.168.%';
mysql> 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
2.5 MySQL中插入行
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> select * from db1.t1; Empty set (0.01 sec) mysql> insert into db1.t1 values (1, 'abc'); Query OK, 1 row affected (0.02 sec) mysql> select * from db1.t1; +------+------+ | id | name | +------+------+ | 1 | abc | +------+------+ 1 row in set (0.00 sec)
2.6 更改表的某一行
mysql> update db1.t1 set name='aaa' where id=1; Query OK, 1 row affected (0.01 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> select * from db1.t1; +------+------+ | id | name | +------+------+ | 1 | aaa | +------+------+ 1 row in set (0.00 sec)
2.7 清空某個表的數據，不刪除表只清空表的數據
mysql> truncate table db1.t1; Query OK, 0 rows affected (0.04 sec) mysql> select * from db1.t1; Empty set (0.00 sec)
2.8 刪除表drop
mysql> drop table db1.t1; Query OK, 0 rows affected (0.03 sec) mysql> select * from db1.t1; ERROR 1146 (42S02): Table 'db1.t1' doesn't exist
2.9 刪除數據庫
mysql> drop database db1; Query OK, 0 rows affected (0.00 sec) mysql> select * from db1; ERROR 1046 (3D000): No database selected
3、MySQL數據庫備份恢復
備份和恢復MySQL數據庫是很是重要的，要牢固掌握less
3.1 用mysqldump命令備份，重定向到一個文本文檔中.
mysql> quit Bye [root@xavi ~]# mysqldump -uroot -pxavilinux mysql > /tmp/mysqlbak.sql; Warning: Using a password on the command line interface can be insecure.
3.2 mysql數據恢復，反向重定向
[root@xavi ~]# mysql -uroot -pxavilinux -e "create database mysql2" Warning: Using a password on the command line interface can be insecure. [root@xavi ~]# mysql -uroot -pxavilinux mysql2 < /tmp/mysqlbak.sql Warning: Using a password on the command line interface can be insecure.
3.3 進入該數據庫，檢查
[root@xavi ~]# mysql -uroot -pxavilinux mysql2 Warning: Using a password on the command line interface can be insecure. Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A 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) mysql> select database(); +------------+ | database() | +------------+ | mysql2 | +------------+ 1 row in set (0.00 sec)
備份數據庫下的表
mysql> quit Bye [root@xavi ~]# mysqldump -uroot -pxavilinux mysql user > /tmp/user.sql Warning: Using a password on the command line interface can be insecure. [root@xavi ~]# less /tmp/user.sql
- less查看
[root@xavi ~]# less /tmp/user.sql
mysql Ver 14.14 Distrib 5.6.35, for linux-glibc2.5 (x86_64) using EditLine wrapper
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.
Usage: mysql [OPTIONS] [database]
-?, --help Display this help and exit.
-I, --help Synonym for -?
--auto-rehash Enable automatic rehashing. One doesn't need to use
'rehash' to get table and field completion, but startup
and reconnecting may take a longer time. Disable with
--disable-auto-rehash.
(Defaults to on; use --skip-auto-rehash to disable.)
-A, --no-auto-rehash
No automatic rehashing. One has to use 'rehash' to get
table and field completion. This gives a quicker start of
mysql and disables rehashing on reconnect.
3.4 恢復某個數據表
[root@xavi ~]# mysql -uroot -pxavilinux mysql2 < /tmp/user.sql Warning: Using a password on the command line interface can be insecure.
3.5 備份全部的庫
[root@xavi ~]# mysqldump -uroot -pxavilinux mysql2 >/tmp/user.sql Warning: Using a password on the command line interface can be insecure. [root@xavi ~]# less /tmp/mysql_all.sql
3.6 只備份表結構
[root@xavi ~]# mysqldump -uroot -pxavilinux -d mysql2 > /tmp/mysql2.sql
Warning: Using a password on the command line interface can be insecure.
[root@xavi ~]# less /tmp/mysql2.sql
[root@xavi ~]# less /tmp/mysql2.sql
-- MySQL dump 10.13 Distrib 5.6.35, for linux-glibc2.5 (x86_64)
--
-- Host: localhost Database: mysql2
-- ------------------------------------------------------
-- Server version 5.6.35
/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;
/*!40103 SET TIME_ZONE='+00:00' */;
/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;
/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;
/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;
/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;
--
-- Table structure for table `columns_priv`
--
DROP TABLE IF EXISTS `columns_priv`;
/*!40101 SET @saved_cs_client = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `columns_priv` (
`Host` char(60) COLLATE utf8_bin NOT NULL DEFAULT '',
`Db` char(64) COLLATE utf8_bin NOT NULL DEFAULT '',
`User` char(16) COLLATE utf8_bin NOT NULL DEFAULT '',
`Table_name` char(64) COLLATE utf8_bin NOT NULL DEFAULT '',
`Column_name` char(64) COLLATE utf8_bin NOT NULL DEFAULT '',
`Timestamp` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`Column_priv` set('Select','Insert','Update','References') CHARACTER SET utf8 NOT NULL DEFAULT '',
PRIMARY KEY (`Host`,`Db`,`User`,`Table_name`,`Column_name`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='Column privileges';
/*!40101 SET character_set_client = @saved_cs_client */;
--
-- Table structure for table `db`
--
DROP TABLE IF EXISTS `db`;
/*!40101 SET @saved_cs_client = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `db` (
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