Windows10 installs both MySQL 5 and MySQL 8

Windows10 At the same time to install MySQL5.7 and MySQL8 edition

One 、 Download two versions of MySQL

Go to the official website to download ：https://www.mysql.com/
Click on Downloads

Slide down to find MySQL Community Server

Direct entry yes MySQL8 edition , Then download the compressed version
Click on the previous version in the upper right corner , download MySQL5 edition

Also download the compressed version

Two 、 Put the downloaded compressed package in the appropriate location and decompress it

Be careful ： Here, unzip a MySQL5 edition , Install later MySQL8 Decompress when 8.0 edition （ Otherwise, it's easy to go wrong ）

3、 ... and 、 Configure environment variables

1. Right click on my computer -> attribute -> Advanced system setup -> environment variable


2. New variable
The variable value is the corresponding mysql Installation path of version


3. find Path Variable , At the end of the variable , Add two versions of bin

add to
%MYSQL5_HOME%\bin
%MYSQL8_HOME%\bin

Four 、 mount this database

4.1 install MySQL5 database
4.1.1 establish my.ini The configuration file

my.ini The contents of the document （ Directory segmentation uses double slashes ）

[mysql]
#  Set up mysql Client default character set 
default-character-set=utf8
port = 3305
[mysqld]
#  Set up 3305 port 
port = 3305
#  Set up mysql Installation directory 
basedir=D:\\MYSQL\\MYSQL5\\mysql-5.7.37-winx64
#  Set up mysql Database data storage directory （ Automatic generation , Otherwise, it may be wrong ）
datadir=D:\\MYSQL\\MYSQL5\\mysql-5.7.37-winx64\\data
#  Maximum connections allowed 
max_connections=10000
#  The maximum number of connections allowed 
max_user_connections=1000
#  The character set used by the server defaults to 8 Bit coded latin1 Character set 
character-set-server=utf8
#  The default storage engine that will be used when creating a new table 
default-storage-engine=INNODB

#  Connection time 
wait_timeout=31536000
interactive_timeout=31536000

4.1.2 Generate Data Folder
Open as administrator cmd Command prompt , Switch to MySQL5 Of bin Under the path .
Enter the command ：mysqld --initialize
Wait a while , It will regenerate a Data Folder

Find the suffix .err The file of , Open find password password, There is usually a password .

@localhost The following is the randomly generated password

4.1.3 install MySQL5 service

Enter at the command line ( The name is MYSQL5, also Specify that the default configuration file is the one just created my.ini file )
mysqld --install MYSQL5 --defaults-file=D:\MYSQL\MYSQL5\mysql-5.7.37-winx64\my.ini

4.1.4 Turn on MySQL5 service

Enter at the command line
net start MYSQL5

4.1.5 Sign in MYSQL5, And change the password

（1） Login input ：mysql -u root -P 3305 -h localhost -p
Password input .err The random password generated in the file
（2） Modify password input ：( Here the password is changed to 123456)

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';

（3） Refresh the permissions ：flush privileges;

4.2 install MySQL8( And installation MySQL5 Empathy )
4.2.1 establish my.ini file

[mysql]
#  Set up mysql Client default character set 
default-character-set=utf8
port = 3308
[mysqld]
#  Set up 3308 port 
port = 3308
#  Set up mysql Installation directory 
basedir=D:\\MYSQL\\MYSQL8\\mysql-8.0.28-winx64
#  Set up mysql Database data storage directory （ Automatic generation , Otherwise, it may be wrong ）
datadir=D:\\MYSQL\\MYSQL8\\mysql-8.0.28-winx64\\data
#  Maximum connections allowed 
max_connections=10000
#  The maximum number of connections allowed 
max_user_connections=1000
#  The character set used by the server defaults to 8 Bit coded latin1 Character set 
character-set-server=utf8
#  The default storage engine that will be used when creating a new table 
default-storage-engine=INNODB

#  Connection time 
wait_timeout=31536000
interactive_timeout=31536000

4.2.2 Generate data Folder
Open as administrator cmd Command prompt , Switch to MySQL8 Of bin Under the path .
Enter the command ：mysqld --initialize
Wait a while , It will regenerate a Data Folder
Find the same .err file , Find the corresponding generated random password

4.2.3 install MySQL8 service
Enter at the command line ( The name is MYSQL8, also Specify that the default configuration file is the one just created my.ini file )
mysqld --install MYSQL8 --defaults-file=D:\MYSQL\MYSQL8\mysql-8.0.28-winx64\my.ini

4.2.4 Turn on MySQL8 service

Enter at the command line
net start MYSQL8

4.1.5 Sign in MYSQL8, And change the password

（1） Login input ：mysql -u root -P 3308 -h localhost -p
Password input .err The random password generated in the file
（2） Modify password input :

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'lyl188338';

（3） Refresh the permissions ：flush privileges;

5、 ... and . View service

Then open the graphical interface. Both databases can be connected