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1.1 MySQL-yum方式安装
阅读量:703 次
发布时间:2019-03-17

本文共 4251 字,大约阅读时间需要 14 分钟。

环境

我使用的运行环境是Windows10搭配VMware Pro16.0和CentOS 8.3系统。

简述

MySQL是全球最流行的关系型数据库管理系统(RDBMS),广泛应用于数据存储和管理领域。

安装

安装步骤

通过以下命令安装MySQL

[root@localhost ~]# yum install mysql[root@localhost ~]# yum install mysql-server

查看版本

确认MySQL安装版本

[root@localhost ~]# rpm -qi mysql-server_name        : mysql-server_version     : 8.0.21_release     : 1.module_el8.2.0+493+63b41e36_architecture: x86_64_install Date: Thu 11 Mar 2021 11:54:32 AM CST_group       : Unspecified

初次登录

打开MySQL命令提示符

[root@localhost ~]# mysqlWelcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 10Server version: 8.0.21 Source distribution

关闭MySQL

退出MySQL命令提示符

mysql> exitBye

服务管理

启动和配置MySQL服务

[root@localhost ~]# systemctl enable mysqldCreated symlink /etc/systemd/system/multi-user.target.wants/mysqld.service → /usr/lib/systemd/system/mysqld.service.

配置文件

查看和编辑MySQL配置文件

[root@localhost ~]# vim /etc/my.cnf

命令参考

以下是一些常用MySQL命令的操作说明

说明 命令
数据库操作 ——————
创建数据库 CREATE DATABASE database_name;
删除数据库 DROP DATABASE database_name;
查看数据库 SHOW DATABASES;
使用数据库 USE database_name;
查看表结构 SHOW TABLE STATUS FROM database_name;
表操作 ——————
创建表 CREATE TABLE table_name (column_name column_type);
删除表 DROP TABLE table_name;
查看表架构 DESCRIBE table_name;
查看表索引 SHOW INDEX FROM table_name;
列操作 ——————
添加列 ALTER TABLE table_name ADD column_name column_type;
删除列 ALTER TABLE table_name DROP column_name;
行操作 ——————
插入新行 INSERT INTO table_name (field1, field2, ... fieldN) VALUES (value1, value2, ... valueN);
删除行 DELETE FROM table_name WHERE [condition];
更新行 UPDATE table_name SET field1=new-value1, field2=new-value2 ... WHERE [condition];

示例操作

以下操作示例帮助你快速熟悉MySQL命令

查看所有数据库

mysql> SHOW DATABASES;+--------------------+| Database           |+--------------------+| information_schema || mysql              || performance_schema || sys                |+--------------------+4 rows in set (0.01 sec)

创建新数据库

创建名为centos的数据库

mysql> CREATE DATABASE centos;Query OK, 1 row affected (0.00 sec)mysql> SHOW DATABASES;+--------------------+| Database           |+--------------------+| centos             || information_schema || mysql              || performance_schema || sys                |+--------------------+5 rows in set (0.00 sec)

删除数据库

删除centos数据库

mysql> DROP DATABASE centos;Query OK, 0 rows affected (0.00 sec)mysql> SHOW DATABASES;+--------------------+| Database           |+--------------------+| information_schema || mysql              || performance_schema || sys                |+--------------------+4 rows in set (0.00 sec)

创建新表

创建名为potluck的表

mysql> CREATE TABLE potluck (id INT NOT NULL PRIMARY KEY AUTO_INCREMENT, name VARCHAR(20), telephone VARCHAR(11), address VARCHAR(50), confirmed CHAR(1),signup_date DATE) ENGINE=InnoDB DEFAULT CHARSET=utf8;Query OK, 0 rows affected (0.01 sec)mysql> SHOW tables;+----------------+| Tables_in_centos |+----------------+| potluck          |+----------------+1 row in set (0.00 sec)

插入数据

将数据插入到potluck表中

mysql> INSERT INTO `potluck` (`id`,`name`,`telephone`,`address`,`confirmed`,`signup_date`) VALUES (NULL, "Zhangsan", "12345678901", "School", "Y", '1020-01-01');Query OK, 1 row affected (0.01 sec) mysql> INSERT INTO potluck (id,name,telephone,address,confirmed,signup_date)VALUES (NULL, "Lingqu", "12345678902", "School", "N", '1020-01-02');Query OK, 1 row affected (0.01 sec)

更新数据

更新Saodiseng的记录

mysql> UPDATE `potluck` SET `confirmed` = 'Y' WHERE `potluck`.`name` = 'Saodiseng';Query OK, 1 row affected (0.00 sec)mysql> SELECT * FROM potluck;+----+--------+---------+-------------+-----------+-------------+| id | name    | telephone | address      | confirmed | signup_date |+----+--------+---------+-------------+-----------+-------------+| 1  | Zhangsan | 12345678901 | School      | Y         | 1020-01-01 |+----+--------+---------+-------------+-----------+-------------+

删除数据

删除特定记录

mysql> DELETE from potluck WHERE name = 'Lingqu';Query OK, 1 row affected (0.00 sec)mysql> SELECT * FROM potluck;+----+--------+---------+-------------+-----------+-------------+| id | name    | telephone | address      | confirmed | signup_date |+----+--------+---------+-------------+-----------+-------------+| 1  | Zhangsan | 12345678901 | School      | Y         | 1020-01-01 |+----+--------+---------+-------------+-----------+-------------+

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