1. Foundation of MySQL database (1- installation and basic operation)

1 MySQL Database and workbench Installation of

1.1 MySQL Basic installation methods

1、 Download and installation are divided into zip Version and installation package msi
2、 In this column, select zip install , Official website connection ：MySQL Community Downloads
3、 Installation tutorial reference connection ： Portal

1.2 MySQL The basic steps of installation

Step 1. Unzip it in the folder , New folder date and database

Step 2. Below the environment variable path add to bin Catalog

Step 3. New in folder ini The content of the document is ：

[mysqld]
#  Set up 3306 port 
port=3306
#  Set up mysql Installation directory 
basedir= The installation directory 
#  Set up mysql Database data storage directory 
datadir= The installation directory \Data
#  Maximum connections allowed 
max_connections=200
#  Number of connection failures allowed .
max_connect_errors=10
#  The character set used by the server defaults to utf8mb4
character-set-server=utf8mb4
#  The default storage engine that will be used when creating a new table 
default-storage-engine=INNODB
#  By default “mysql_native_password” Plug in authentication 
#mysql_native_password
default_authentication_plugin=mysql_native_password
[mysql]
#  Set up mysql Client default character set 
default-character-set=utf8mb4
[client]
#  Set up mysql The default port when the client connects to the server 
port=3306
default-character-set=utf8mb4

Step 4. Operation administrator cmd

Step 5. cmd Enter into MySQL Of bin Catalog

Step 6. mysqld --initialize --console, remember [email protected] The code behind

Step 7. mysqld --install

Step 8. net start mysql

Step 9. mysql -u root -p Then enter the password

Step 10. alter user 'root'@'localhost' identified by ' New password ';

Step 11. exit sign out

1.3 MySQL workbench install

1、 Open installation package .msi file , Double-click on the run , Specify the installation directory

2、 choice complete install , Ensure that no redundant content is configured in the future

3、 installation is complete

2 Using terminals and MySQL workbench Conduct MySQL Basic operation

2.1 Log in and create databases and data tables at the terminal

window window , Using shortcut keys win+r Input cmd Enter the terminal window , Enter the following command to operate mysql database .

 Log in to the database , Then enter the password ：mysql -u root -p

 Create database mysql_demo01：create database mysql_demo01;

 Display all databases ：show databases;

 Use a database , for example mysql_demo01：use mysql_demo01;

 Look at all the data sheets ：show tables;

 New database ：create table demo01 (name varchar(20),sex varchar(10));

 Look at the data table structure ：desc demo01;

 insert data ：insert into demo01 values (' Zhang San ', ' male ');

 Query table content ：select * from demo01;

 Modifying data ：update demo01 set sex = ' Woman ' where name = ' Zhang San ';

 Delete a data item ：delete from demo01 where name = ' Li Si ';

 Delete table ：demo01：drop table demo01;

 Exit database ：exit

2.2 Use workbench Create database and basic operations

1、 Access to database ： open workbench, choice MySQL connections, You can choose local instance MySQL Enter the password to enter

2、 Familiar with the layout , Create data ： stay navigator Under item column , choice schemas, Easy to view the database , Select the create database flag , Create database database_demo02; Then click... By default apply、apply、finish that will do .

3、 Create data table ： an database_demo02 database , stay tables Right click create table, Then name the data table demo01, At this point, it is best to expand the window , stay column name The requirements of the following input columns , For example, there are names here name And gender sex

4、 Add data , And implement sql sentence ： Expand databases and data tables , stay demo01 The list icon behind the database mouse movement opens , Jump to the view interface . To write sql The sentence changes Zhang San's gender , stay Query Options bar , choice execute current statement Execute the current sql sentence .