[redis] quick start

One 、 What is? NoSQL ？

• Introducing Redis Before , We need to be right first NoSQL There is a simple connection ,Redis It's also common NoSQL database .
• NoSQL： namely Not-Only SQL, Non relational database in general , As a supplement to relational databases .
• effect ： Dealing with data processing problems based on massive users and massive data .
• features ：
  • Expandable , Telescopic
  • High performance with large amount of data
  • Flexible data model
  • High availability
• common NoSQL database ：
  • Redis
  • MongoDB
  • HBase
  • …

Two 、 What is? Redis ？

• Redis： namely Remote Dictionary Server, Yes, it is C Language development of an open source high-performance key value pair （ key - value ） database .
• features ：
  • There is no necessary relationship between databases
  • Internal use single thread mechanism to work
  • High performance
  • Support multiple data types , Such as ：string String type ,list List the type ,hash Hash type ,set Collection types ,sorted_set Ordered set type .
  • Support persistence
• Application scenarios ：
  • Speed up the query of hot data , Such as ： Hot products 、 hot news 、 Hot information and other high traffic information .
  • Task queue , Such as ： seckill 、 Rush purchase 、 Queuing up for tickets, etc .
  • Instant messaging , Such as ： Ranking List 、 Website visit statistics 、 Number of people online .
  • Time effective information control , Such as ： Captcha control 、 Vote control .
  • Distributed data sharing
  • Message queue
  • …

3、 ... and 、Redis Download and install of

• Download address ：Redis Windows Version download ,Redis have Windows and Linux Two versions , This time we introduce Windows Download and installation of version , The download link is shown above , Need to GitHub Download in , Want to enter GitHub Need to climb over the wall , There must be countless wall climbing software in your hands . If there is no wall climbing software , You can send it to a blogger , The blogger will send you the downloaded compressed package .
• After downloading, you will get a compressed package , After decompression, you can use it directly , Very convenient , The following figure shows the contents contained in the folder .
  
• among , In the beginning stage , We often use " redis-cli.exe " and " redis-server.exe " ," redis-cli.exe " For the command line client ," redis-server.exe " Start the program for the server , When using , We need to start " redis-server.exe " Turn on the service , After opening, you will see the black box as shown in the following figure , You can see the current version information 、Port The port number and PID etc. .

• After opening the server , Let's run " redis-cli.exe " Client program , You will also get a black box as shown in the figure below , We write commands in it to complete relevant operations .

Four 、Redis Basic operation

When using command line mode tools , Usually , We all need to master the following four categories of commands ：

• Functional commands
• Clear screen information command
• Help information lookup command
• Exit command

1、 Information addition command

• function ： Set up key,value
• Format ：set key value
• Example ：set name origin, among key = name,value = origin
  

2、 Information query command

• function ： according to key Query corresponding value value , If it doesn't exist , It returns null （ nil ）, stay Redis Use in nil Said empty , amount to Java Medium null.
• Format ：get key
• Example ：get name, That is to get name The corresponding value value .
  

3、 Clear screen information command

• function ： Clear the information on the screen , That is what we often call screen clearing operation .
• Format ：clear
• After using the command , The information in the screen will be cleared , Get a cleaner screen , So that we can write other function commands .

4、 Help order

• function ： Get the command help document , Get all command information names in the group .
• Format ：
  • help Command name , That is, get the help document of the command .
  • help @ Group name , That is, get all the command information in the command group .
• Example 1 ： obtain set Help documentation for commands
  
• Example 2 ： obtain string All command information in the Group
  

5、 Exit command

• function ： Exit client
• Format ：
  • quit
  • exit
  • In keyboard ESC key

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