MySQL (1) Installation and Getting Started

System information: windows 10, mysql-8.0.19-winx64 is
released for communication and future review.

Ready to work

download

mysql-8.0.19-winx64 download link , zip file one-click download

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installation

unzip

Unzip the downloaded compressed file to the target directory (the final MySQL installation directory), for example

D:\software\MySQL\mysql-8.0.19-winx64

Configure environment variables

Control Panel>All Control Panel Items>System—Advanced System Settings—Environment Variables

Variable name: MYSQL_HOME

Variable value: D:\software\MySQL\mysql-8.0.19-winx64

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Generate data file

Run cmd as administrator

d:
cd D:\software\MySQL\mysql-8.0.19-winx64\bin
mysqld --initialize-insecure --user=mysql

Execute the above command to generate the data directory in the D:\software\MySQL\mysql-8.0.19-winx64 directory

Install and start MySQL

Excuting an order:

mysqld -install
net start MySQL

Pay attention to the order, otherwise an error will be reported: the service name is invalid.

Log in to MySQL

Connect to the local MySQL. There is no password for the first login. You don't need to enter a password, just press Enter.

mysql -u root -p

Possible problems

报错：Can’t connect to MySQL server on ‘localhost’ (10061)

Reason: MySQL service is not enabled on the computer

solve:

Windows+R invokes the running window, enters services.mscenter, and the service (local) interface pops up
Find the MySQL service in the service list on the right (if not, please execute mysqld -install)
Turn on the service

change Password

ALTER USER'root'@'localhost' IDENTIFIED WITH mysql_native_password BY'****', take changing the password as ysli123an example

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'ysli123';
flush privileges;

flush privilegesSave the modified content, remember to enter the password when you enter again after modification

drop out

quit

operating

Database operation

Sample database name: mysql_ysli

Create database

create database <database name>;

create database mysql_ysli;

Delete database

drop database <database name>;

drop database mysql_ysli;

Select database

use <database name>;

use mysql_ysli;

Data table operation

Sample data table name: ysli_table

Create data table

The following information is required to create a MySQL data table:

Table Name
Table field name
Define each table field

CREATE TABLE table_name (column_name column_type);

create table ysli_table(
ysli_id int not null auto_increment,
ysli_title varchar(100) not null,
ysli_body varchar(100) not null,
primary key (ysli_id)
)engine=InnoDB default charset=utf8;

The auto_increment definition column is an attribute of self-increment, which is generally used for the primary key, and the value is automatically increased by 1.
The primary key keyword is used to define the column as the primary key. You can use multiple columns to define the primary key, separated by commas.
engine sets the storage engine, charset sets the encoding.
If you don't want the field to be null, you can set the field's property to not null, and an error will be reported if the data entered in the field is null when operating the database.

Delete data table

drop database <data table name>;

drop table ysli_table;

Insert data

insert into <table_name> ( field1, field2,...fieldN )
                    	VALUES
                    	( value1, value2,...valueN );

Example (character data needs to use single or double quotes):

insert into ysli_table (ysli_title,ysli_body)
                    	values
                    	('example','123mysql内容');

Query data table

SELECT column_name,column_name
FROM table_name
[WHERE Clause]
[LIMIT N][ OFFSET M]

You can use one or more tables in the query statement, separate the tables with a comma (,), and use the WHERE statement to set the query conditions.
The SELECT command can read one or more records.
You can use an asterisk (*) to replace other fields, the SELECT statement will return all the field data of the table
You can use the WHERE statement to include any conditions.
You can use the LIMIT property to set the number of records returned.
You can use OFFSET to specify the data offset at which the SELECT statement starts to query. By default, the offset is 0.

select * from ysli_table;

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Main reference: rookie tutorial