Acquaintance Mysql
Cognitive
数据库:DB
所有的数据存放的仓库
每一个文件夹也是数据库
数据库管理员:DBA
管理数据库软件
数据库服务器:一台跑着一个数据库管理软件的机器
表:文件，一张存储了数据的表
数据/记录：表中的信息，一行就是一条记录Learn Mysql
Database management software classified --DBMS
Relational database table structure needs to have
a non-relational database is a key-value store, the table structure is not
关系型数据库:如sqllite，db2，oracle，access，sql server，MySQL，注意：sql语句通用
非关系型数据库:mongodb，redis，memcacheEnvironment Variables
python —>python.exe
Python.exe file can be found in any directory
Enter the command to start the python interpreter python in any position
- mysqld install install mysql service mysql service was registered with the operating system
- net start mysql start mysql service
- net stop mysql service mysql stop
-sudo mysql.server stop stop the MySQL service
-sudo mysql.server restart to restart the MySQL service
-sudo mysql.server status to view the status of MySQL services
Start the client connects to the server end
mysql -uroot -p123 -h192.168.14.12 telnet < '- h'>
mysql> select user (); view the current logged-on user
mysql> set password = password ( '123'); set a password for the current user
Creating a user other
create user 'guest'@'192.168.14.%' identified by '123';
To a user authorization
. Grant permission type on ftp * to 'guest'@'192.168.14.%';
grant all
grant select on day37.* to 'guest'@'192.168.14.%';
grant select,inster
#进入mysql客户端
$mysql
mysql> select user(); #查看当前用户
mysql> exit # 也可以用\q quit退出
# 默认用户登陆之后并没有实际操作的权限
# 需要使用管理员root用户登陆
$ mysql -uroot -p # mysql5.6默认是没有密码的
#遇到password直接按回车键
mysql> set password = password('root'); # 给当前数据库设置密码
# 创建账号
mysql> create user 'eva'@'192.168.10.%' IDENTIFIED BY '123';# 指示网段
mysql> create user 'eva'@'192.168.10.5' # 指示某机器可以连接
mysql> create user 'eva'@'%' #指示所有机器都可以连接
mysql> show grants for 'eva'@'192.168.10.5';查看某个用户的权限
# 给账号授权
mysql> grant all on *.* to 'eva'@'%';
mysql> flush privileges; # 刷新使授权立即生效
# 创建账号并授权
mysql> grant all on *.* to 'eva'@'%' identified by '123'
# 用户相关操作
# 查看当前用户是谁? select user();
# 给当前用户设置密码 set password = password('123');
# 创建用户 create user '用户名'@'主机的ip/主机域名' identified by '密码'
# 授权 grant select on 数据库名.* to '用户名'@'主机的ip/主机域名' identified by '密码'
# 授权并创建用户 grant select on 数据库名.* to '用户名'@'主机的ip/主机域名'
Database operations
- View all databases show databases;
- Create a database create database database name;
- Switch to the name of this library use the database
- How many tables show tables next to see this library;
Operating Table
- View all the tables show tables at the library;
- Create a table
create table table name (field data type (length), Field Name Data Type (length), ..);
create table Student (name char (12 is), Age int);
- Delete a table drop table table name;
- View table structure desc table name // describe table name
Operating data
Insert data
insert into table values (data line), (line data) (data line);
insert into table (field, ...) values (row of data, ...);
delete data
delete from table where conditions;
change the data
update table set field = value, the value of field 2 = 2 WHERE condition;
Query data
select fields (*) from table name;
Operating databases, tables, content summary
1. 操作文件夹（库）
增：create database db1 charset utf8;
查：show databases;
改：alter database db1 charset latin1;
删除: drop database db1;
2. 操作文件（表）
先切换到文件夹下：use db1
增：create table t1(id int,name char);
查：show tables;
改：alter table t1 modify name char(3);
alter table t1 change name name1 char(2);
删：drop table t1;
3. 操作文件中的内容（记录）
增：insert into t1 values(1,'egon1'),(2,'egon2'),(3,'egon3');
查：select * from t1;
改：update t1 set name='sb' where id=2;
删：delete from t1 where id=1;
清空表：
delete from t1; #如果有自增id，新增的数据，仍然是以删除前的最后一样作为起始。
truncate table t1;数据量大，删除速度比上一条快，且直接从零开始，Additional ip
# ip和域名
# 搜索的机器
# 10.125.23.1 sogou.search01.org
# 10.125.23.2 sogou.search02.org
# 10.125.23.3 sogou.search03.org
# 10.125.23.4 sogou.search04.org
# 浏览器
# 10.135.24.7
# 10.135.24.8
# 10.135.24.9
# 10.135.24.10
#
# www.baidu.com 136.17.2.2