1、 Initial mysql, MySQL installation, environment configuration, initialization

Database details （MySQL）

One 、 initial MySQL

1、JavaEE： Enterprise class Java Development web

front end （ page ： Exhibition , data ！）

backstage （ Connection point ： Connect to database JDBC, Connect front end （ control , Control view jump , And passing data to the front end ））

database （ Save the data ,Txt,Excel,word）

1.1、 Why study databases ？

1、 Position requirements

2、 Big data era

3、 Forced to demand ： Need a tool to store data

4、 Database is the core of all software systems

1.2、 What is a database

1、 database ,（DB,DataBase）. Software , Installed on top of the operating system ！SQL sentence , It can store a lot of data ,500 ten thousand ！

2、 effect ： Store the data , Management data

1.3、 Database classification

1、 Relational database ： That's ok 、 Column （SQL）

• MySQL,Oracle,SqlServer,DB2,SQLlite
• Between tables , The relationship between rows and columns is used to store data , Student information sheet , Attendance Sheet

2、 Non relational database ： （NoSQL）NOT ONLY SQL

• Redis,MongDB
• Non relational database , Object storage , It is determined by the properties of the object itself

3、DBMS( Database management system ) ： Manage and manipulate data

• Database management software , Scientific and effective management of our data . Maintain and access data ;
• MySQL, Database management system

1.4、MySQL brief introduction

MySQL Is a relational database management system , The Swedish MySQL AB Companies to develop , Now belongs to Oracle Its products .MySQL Is one of the most popular relational database management systems . Relational databases keep data in different tables ,MySQL What is used is SQL Language . Applicable to large, medium and small websites

Official website ：https://www.mysql.com/

1.5、 install MySQL

1. zip Download address ：

https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.19-winx64.zip

2. decompression
3. Put this package in your environment directory
4. Add environment variables

• stay path Add bin The file path of the directory D:\JavaEnvironment\mysql-5.7.19\bin
• Add success

5. newly build mysql The configuration file

• my.ini

【mysqld】
# The catalogue must be changed to its own 
basedir=D:\JavaEnvironment\mysql-5.7.19\
datadir=D:\JavaEnvironment\mysql-5.7.19\data\
port=3306
skip-grant-tables

6. install mysql service ： Start... In administrator mode CMD, And switch the path to mysql Under the bin Catalog , Then input mysqld-install（ install mysql）

C:\Windows\system32>cd /d D:\JavaEnvironment\mysql-5.7.19\bin

D:\JavaEnvironment\mysql-5.7.19\bin>mysqld -install

Service successfully installed.

7. Initialization data , Input mysqld --initialize-insecure --user=mysql

• There is an error ：mysqld: [ERROR] Found option without preceding group in config file
• solve ： hold .ini Save file as Anis Format , The default is utf-8, Cause error . Successfully initialized and added after modification data file

8. start-up mysql, Change Password （ From the command line ）

• open mysql：net start mysql
• Get into mysql Management interface ：mysql -u root -p
• change root password ：

update mysql.user set authentication_string=password('123456') where user='root' and Host='localhost';

• Finally, refresh the permissions ：flush privileges;

9. modify .ini file , Delete the last sentence skip…
10. restart mysql It can be used normally net start mysql net stop mysql