一、初始化mariaDB服务程序：

yum install mariadb mariadb-server           //安装mariaDB
systemctl start mariadb                      //启动mariadb
systemctl enable mariadb                     //添加到开机启动项中

初始化数据库服务程序：

[root@mysql-server ~]# mysql_secure_installation
NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDBSERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!
In order to log into MariaDB to secure it, we'll need the current
password for the root user.  If you've just installed MariaDB, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.Enter current password for root (enter for none):          当前数据库密码为空，直接回车
OK, successfully used password, moving on...Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisation.Set root password? [Y/n] y                  设置root用户的数据库密码
New password:
Re-enter new password:
Password updated successfully!
Reloading privilege tables..... Success!
By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.Remove anonymous users? [Y/n] y            删除匿名账号... Success!Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.Disallow root login remotely? [Y/n] y         禁止root用户从远程登陆... Success!By default, MariaDB comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.Remove test database and access to it? [Y/n] y      删除test库，并取消对其的访问权限- Dropping test database...... Success!- Removing privileges on test database...... Success!Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.Reload privilege tables now? [Y/n] y           刷新授权表，让初始化后的设定立即生效... Success!Cleaning up...All done!  If you've completed all of the above steps, your MariaDB
installation should now be secure.Thanks for using MariaDB!

设置防火墙对数据库服务的允许策略：

[root@mysql-server ~]# firewall-cmd --permanent --add-service=mysql
success
[root@mysql-server ~]# firewall-cmd --reload
success

使用root用户登陆到数据库中：

[root@mysql-server ~]# mysql -u root -p
Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 15
Server version: 5.5.52-MariaDB MariaDB Server
Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]>
MariaDB [(none)]> set password = password('123456');                 //修改当前用户的数据库密码

二、管理数据库与表单数据：

1、创建一个新的数据库用户：:CREATE USER 用户名@主机名 IDENTIFIED BY ‘密码’;

MariaDB [(none)]> create user cw@localhost IDENTIFIED BY '123456';
MariaDB [mysql]> show databases;                               //查看数据库
MariaDB [(none)]> use mysql;              //进入到mysql数据库MariaDB [mysql]> select host,user,password from user where user='cw';     //查看新创建的用户名、主机、姓名与密码信息

2、修改新建用户权限：（默认权限只能访问）

数据库GRANT命令的授权操作常用方案：

举例：

MariaDB [(none)]> GRANT SELECT,UPDATE,DELETE,INSERT on mysql.user to cw@localhost;//给予cw用户对mysql数据库的user表单查询、更新、删除、插入权限；MariaDB [(none)]> show grants for cw@localhost;
//查看cw用户当前的授权MariaDB [(none)]> revoke SELECT,UPDATE,DELETE,INSERT on mysql.user from cw@localhost;//移除cw用户对musql数据库的user表单查询、更新、删除、插入权限

3、创建数据库与表单
常用的数据库表单管理命令：

MariaDB [mysql]> create database linuxprobe;
MariaDB [mysql]> use linuxprobe;
MariaDB [linuxprobe]> create table mybook(name char(15),price int,pages int);
MariaDB [linuxprobe]> describe mybook;          //查看mybook表头信息
+-------+----------+------+-----+---------+-------+
| Field | Type     | Null | Key | Default | Extra |
+-------+----------+------+-----+---------+-------+
| name  | char(15) | YES  |     | NULL    |       |
| price | int(11)  | YES  |     | NULL    |       |
| pages | int(11)  | YES  |     | NULL    |       |
+-------+----------+------+-----+---------+-------+
3 rows in set (0.00 sec)

4、管理表单数据：
向表单中插入新的书籍数据：

MariaDB [linuxprobe]> INSERT INTO mybook(name,price,pages) VALUES('linuxprobe','60',518);MariaDB [linuxprobe]> select * from mybook;               //查看表中数据
+------------+-------+-------+
| name       | price | pages |
+------------+-------+-------+
| linuxprobe |    60 |   518 |
+------------+-------+-------+
1 row in set (0.01 sec)MariaDB [linuxprobe]> update mybook set price=55;           //将价格修改为55元；MariaDB [linuxprobe]> delete from mybook;                  //删除书籍表单中的内容；

5、where命令用于数据库匹配查询：

MariaDB [linuxprobe]> select * from mybook;
+-------------+-------+-------+
| name        | price | pages |
+-------------+-------+-------+
| linuxprobe1 |    55 |   518 |
| linuxprobe2 |    60 |   518 |
| linuxprobe3 |    70 |   518 |
| linuxprobe4 |    75 |   518 |
| linuxprobe5 |    80 |   518 |
+-------------+-------+-------+
5 rows in set (0.00 sec)

查看价格大于75的书籍：

MariaDB [linuxprobe]> select * from mybook where price>75;

搜索价格不等于80的书籍：

MariaDB [linuxprobe]> select * from mybook where price<>80;MariaDB [linuxprobe]> select * from mybook where price!=80;

6、数据库备份与恢复：
mysqldump命令用于备份数据库数量，格式为“mysqldump [参数] [数据库名称]”。

将书籍数据库文件导出到家目录：

[root@mysql-server ~]# mysqldump -uroot -p123456 linuxprobe > /root/linuxprobeDB_bak.sql

删除书籍数据库：

MariaDB [(none)]> drop database linuxprobe;

创建一个空的数据库：

MariaDB [(none)]> create database linuxprobe_bak;

导入刚刚备份的数据库至linuxprobe_bak库中：

[root@mysql-server ~]# mysql -uroot -p123456 linuxprobe_bak < /root/linuxprobeDB_bak.sql

参考链接：

MariaDB数据库服务：https://mp.weixin.qq.com/s/nyovCY3uhW_SRp2nR9X92Q

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MariaDB数据库服务常见操作

二、管理数据库与表单数据：

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