MySQL download and installation environment settings

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Preface

MySQL Is a relational database management system , Relational databases keep data in different tables , Instead of putting all the data in one big warehouse , This increases speed and flexibility .
MySQL What is used SQL Language is the most commonly used standardized language for accessing database .MySQL The software adopts a dual licensing policy , It is divided into community version and commercial version , Because of its small size 、 Fast 、 Low total cost of ownership , Especially open source , Generally, the development of small and medium-sized websites and large-scale websites all choose MySQL As website database .

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One 、MySql Download the profile

MySql 5.7.37 Official download address
Optional 32 Bit or 64 Bit two

Decompress and copy to the system disk after downloading （C disc ）

Environment settings

take MySql Of bin Copy the path to the system environment variable

install MySql

Run as administrator cmd Enter this path
Installation command

mysqld -install

Unload command

mysqld --remove mysql

Then set the startup MySql The configuration file is shown in the figure below

Create a new text document and copy the following code into the text document

[mysqld]
basedir=C:\mysql-5.7.38-winx64\mysql-5.7.38-winx64   // You need to change it to your own MySql The path address of 
datadir=C:\mysql-5.7.38-winx64\mysql-5.7.38-winx64\data  // You need to change it to your own MySql The path address of 
port=3306

After the change 、 You need to delete the comments in the text document （ Chinese and double slash ）

Then the suffix and name of the text document are changed to my.ini After completion, proceed to the following steps

In the original cmd Window input command mysqld -initialize

mysqld --initialize

Enter and wait a little while after executing the order , Generate a data Folder , As shown in the figure below

data There is a suffix named .err Final document , This file contains the first use MySql A temporary random password generated by is shown in the following figure

start-up MySql

start-up MySql The order of

net start mysql

close MySql The order of

net stop mysql

Get into MySql The order of

mysql -u root -p

Pictured
Will be in data Middle suffix is .err Random password copy in the end file , Input cmd Into MySql Here's the picture

Enter the command to change the password in MySql As shown in the figure below Change the password to 123456

set password for [email protected]host=password('123456'); 

Show all database commands ：show databases;
Select the database command use mydata; //mydata Represents the database name
Display table commands ：show tables;
Direct query statement display table data command ：select * from student; //student Indicates the name of the table
MySql Create database command ：create database mydata;

As shown in the figure

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Qt Source code

qt Connect mysql Source code link