Series 1 --- mysql mysql server set up

The main objective of this experiment is to build mysql server

First, the preparatory work

1, to prepare a host of rhel7.2

2, download the rpm package: wget https://dev.mysql.com/downloads/mysql/mysql-5.7.17-1.el7.x86_64.rpm-bundle.tar

3, unloading system comes with a database of mariadb

  查找：rpm -qa | grep mariadb-server

  如果有的话就卸载：yum -y remove mariadb-server mariadb

  并删除清理/etc/my.cnf配置文件

Second, the installation

1, extract: tar -xf mysql-5.7.17-1.el7.x86_64.rpm-bundle.tar

2, delete the rpm package minimal installation:

rm -rf mysql-community-server-minimal-5.7.17-1.el7.x86_64.rpm

3, the installation dependencies:

 yum -y  install perl-Data-Dumper  perl-JSON  perl-Time-HiRes

4, install the database, -U is an upgrade installation

rpm -Uvh mysql-community-*.rpm

5, restart the service, the service boot from the start

systemctl restart mysqld; systemctl enable mysqld;

6, view and validate

Check whether to activate: ps -aux | grep 3306 netstat -ntulp | grep 3306

The data files: / var / lib / mysql

Wide configuration files path: /etc/my.cnf

Initial log Path: /var/log/mysqld.log

Third, the initial password change process

由于mysql5.7rpm安装过程中，会产生一个原始的密码，必须修改后才能使用

Here's the password so that the editing process:

1, modify the configuration file:

        validate_password_policy=0     //0是取消密码复杂度，默认为1

   validate_password_length=6   //最少密码长度为6

2, restart the database service: systemctl restart mysqld

3, see the original password:

   grep 'temporary password' /var/log/mysqld.log

  得到：root@localhost: l)VFhq1zSto>

4, with the original password: mysql -uroot -p'l) VFhq1zSto> '

 -u指定用户，-p指定密码

5, to modify the original code: set password = password ( "123456");

6, exit, and then use the new password to verify the change of landing.

Fourth, some of the basic operation of the database:

1, the library-related operations:

  select database();              //确认当前所在的库

 create database bbsdb;     //创建数据库

 use  mysql;                         //切换数据库

 drop database bbsdb;        //删除库

2, some of the basic operations related table:

create table stuinfo (name char (10), sex char (5), class char (8)); // Create a table

insert into stuinfo values ​​( "tom", "boy", "123"); // data inserted into the table

update stuinfo set name = "hehe" where sex = "reny"; // update the data table

desc stuinfo; // View table structure

delete from stuinfo; // delete all the contents of the table

drop table stuinfo; // Delete table

3, the operation of the modified table structure:

Adding fields: alter table table Field Name Type add constraints first after (field name);

Delete field: alter table table name drop field names;

Review Field Type: alter table modify table Field Name Type constraints;

Changes to field names: alter table change table name field name New Source Field Name Type constraints;

Modify table: alter table source table name rename the new table name;