目录
安装mysqlyum包
[root@YL ~]# wget http://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
--2022-07-25 14:37:26-- http://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm
Resolving dev.mysql.com (dev.mysql.com)... 23.10.6.175, 2600:140a:1000:28d::2e31, 2600:140a:1000:287::2e31
Connecting to dev.mysql.com (dev.mysql.com)|23.10.6.175|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm [following]
[root@YL ~]# rpm -Uvh mysql57-community-release-el7-11.noarch.rpm
warning: mysql57-community-release-el7-11.noarch.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Verifying... ################################# [100%]
Preparing... ################################# [100%]
Updating / installing...
1:mysql57-community-release-el7-11 ################################# [100%]
禁用mysql
[root@YL ~]# yum module disable mysql
MySQL Connectors Community 25 kB/s | 49 kB 00:01
MySQL Tools Community 342 kB/s | 651 kB 00:01
MySQL 5.7 Community Server 644 kB/s | 2.6 MB 00:04
Dependencies resolved.
Nothing to do.
Complete!
安装mysql需要的服务端客户端命令和工具
[root@YL ~]# yum -y install mysql-community-server mysql-community-client mysql-community-common mysql-community-devel --nogpgcheck
Last metadata expiration check: 0:00:28 ago on Mon 25 Jul 2022 03:00:03 PM CST.
Dependencies resolved.
===========================================================================
Package Arch Version Repository Size
===========================================================================
Installing:
mysql-community-client x86_64 5.7.38-1.el7 mysql57-community 28 M
mysql-community-common x86_64 5.7.38-1.el7 mysql57-community 311 k
mysql-community-devel x86_64 5.7.38-1.el7 mysql57-community 4.2 M
mysql-community-server x86_64 5.7.38-1.el7 mysql57-community 178 M
...........
perl-macros-4:5.26.3-416.el8.x86_64
perl-parent-1:0.237-1.el8.noarch
perl-podlators-4.11-1.el8.noarch
perl-threads-1:2.21-2.el8.x86_64
perl-threads-shared-1.58-2.el8.x86_64
设置mysql的开机自启
[root@YL ~]# systemctl enable --now mysqld
[root@YL ~]# systemctl status mysqld
● mysqld.service - MySQL Server
Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor>
Active: active (running) since Mon 2022-07-25 15:03:53 CST; 6s ago
Docs: man:mysqld(8)
http://dev.mysql.com/doc/refman/en/using-systemd.html
Process: 4325 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run>
Process: 4276 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, sta>
Main PID: 4328 (mysqld)
Tasks: 27 (limit: 4743)
Memory: 247.1M
CGroup: /system.slice/mysqld.service
└─4328 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/>
此时的3306端口已经开启了
[root@YL ~]# ss -antl
State Recv-Q Send-Q Local Address:Port Peer Address:Port Process
LISTEN 0 128 0.0.0.0:22 0.0.0.0:*
LISTEN 0 128 [::]:22 [::]:*
LISTEN 0 80 *:3306 *:*
在日志文件中找出临时密码,修改mysql登陆密码
[root@YL ~]# grep "password" /var/log/mysqld.log
2022-07-25T07:03:51.180440Z 1 [Note] A temporary password is generated for root@localhost: ?Rp,5kU6du;p
使用获取到的临时密码登录mysql
[root@YL ~]# mysql -uroot -p？Rp,5kU6du;p
修改mysql登录密码
mysql> set global validate_password_policy=0;
Query OK, 0 rows affected (0.01 sec)
mysql> set global validate_password_length=1;
Query OK, 0 rows affected (0.00 sec)
mysql> alter user 'root'@'localhost' identified by 'liuyang123!';
Query OK, 0 rows affected (0.00 sec)
mysql> quit
Bye
为了防止mysql自动更新为8.0版本，直接删除前面安装的yum源
[root@YL ~]# rpm -e mysql57-community-release
查看mysql的当前版本
[root@YL ~]# mysql -V
mysql Ver 14.14 Distrib 5.7.38, for Linux (x86_64) using EditLine wrapper
登录mysql数据库
[root@YL ~]# mysql -uroot -pliuyang123!
mysql: [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: 5.7.38 MySQL Community Server (GPL)
Copyright (c) 2000, 2022, Oracle and/or its affiliates.
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>
不进入数据库查看他的内容
[root@YL ~]# mysql -uroot -p -e 'show databases;'
Enter password:
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
mysql DDL的操作
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.00 sec)
创建一个名为liuyang的数据库
mysql> create database if not exists liuyang;
Query OK, 1 row affected (0.01 sec)
查看数据库
mysql> show databses;
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 'databses' at line 1
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| liuyang |
| mysql |
| performance_schema |
| sys |
+--------------------+
5 rows in set (0.00 sec)
删除liuyang这个数据库
mysql> drop database if exists liuyang;
Query OK, 0 rows affected (0.01 sec)
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.00 sec)
表操作
mysql> create table ly(id int not null,name varchar(20),age tinyint(2));
Query OK, 0 rows affected (0.01 sec)
查看表
mysql> show tables;
+-------------------+
| Tables_in_liuyang |
+-------------------+
| ly |
+-------------------+
1 row in set (0.00 sec)
mysql> drop table if exists ly;
Query OK, 0 rows affected> (0.00 sec)
mysql> show tables;
Empty set (0.00 sec)
创建用户
mysql> CREATE USER 'liuyang'@'127.0.0.1' IDENTIFIED BY 'liuyang123!';
Query OK, 0 rows affected (0.00 sec)
[root@YL ~]# mysql -uliuyang -pliuyang123! -h 127.0.0.1
mysql: [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 7
Server version: 5.7.38 MySQL Community Server (GPL)
Copyright (c) 2000, 2022, Oracle and/or its affiliates.
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>
mysql> drop user 'liuyang'@'127.0.0.1';
Query OK, 0 rows affected (0.00 sec)
查看支持的所有字符集
mysql> show character set;
+----------+---------------------------------+---------------------+--------+
| Charset | Description | Default collation | Maxlen |
+----------+---------------------------------+---------------------+--------+
| big5 | Big5 Traditional Chinese | big5_chinese_ci | 2 |
| dec8 | DEC West European | dec8_swedish_ci | 1 |
| cp850 | DOS West European | cp850_general_ci | 1 |
| hp8 | HP West European | hp8_english_ci | 1 |
...........
| gb18030 | China National Standard GB18030 | gb18030_chinese_ci | 4 |
+----------+---------------------------------+---------------------+--------+
41 rows in set (0.00 sec)
查看当前数据库支持的所有存储引擎
mysql> show engines;
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| Engine | Support | Comment | Transactions | XA | Savepoints |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| InnoDB | DEFAULT | Supports transactions, row-level locking, and foreign keys | YES | YES | YES |
| MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO |
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO |
| BLACKHOLE | YES | /dev/null storage engine (anything you write to it disappears) | NO | NO | NO |
| MyISAM | YES | MyISAM storage engine | NO | NO | NO |
| CSV | YES | CSV storage engine | NO | NO | NO |
| ARCHIVE | YES | Archive storage engine | NO | NO | NO |
| PERFORMANCE_SCHEMA | YES | Performance Schema | NO | NO | NO |
| FEDERATED | NO | Federated MySQL storage engine | NULL | NULL | NULL |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
9 rows in set (0.00 sec)
查看数据库信息
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.00 sec)
不进入某数据库而列出其包含的所有表
mysql> show tables from liu;
+---------------+
| Tables_in_liu |
+---------------+
| liuyang |
+---------------+
1 row in set (0.00 sec)
查看表结构
mysql> desc liu.liuyang;
+-------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+--------------+------+-----+---------+-------+
| id | int(11) | NO | | NULL | |
| name | varchar(100) | NO | | NULL | |
| age | tinyint(4) | YES | | NULL | |
+-------+--------------+------+-----+---------+-------+
3 rows in set (0.01 sec)
查看某表的创建命令
mysql> show create table liu.liuyang;
+---------+----------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+---------+----------------------------------------------------------------------------------------------------------------------------------------------------------+
| liuyang | CREATE TABLE `liuyang` (
`id` int(11) NOT NULL,
`name` varchar(100) NOT NULL,
`age` tinyint(4) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+---------+----------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
查看某表的状态
mysql> show table status like 'liuyang'/G
*************************** 1. row ***************************
Name: liuyang
Engine: InnoDB
Version: 10
Row_format: Dynamic
Rows: 0
Avg_row_length: 0
Data_length: 16384
Max_data_length: 0
Index_length: 0
Data_free: 0
Auto_increment: NULL
Create_time: 2022-07-25 21:28:00
Update_time: NULL
Check_time: NULL
Collation: latin1_swedish_ci
Checksum: NULL
Create_options:
Comment:
1 row in set (0.00 sec)
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