Redis database and project framework

1. install redis

1. Download zip

Download address ：https://github.com/tporadowski/redis/releases
spare ：https://hub.fastgit.xyz/tporadowski/redis/releases Bear in mind ： Don't log in to your own account on the mirror website

2. Decompress package , Create a folder , Put the solved folder in the created folder

3. Configure environment variables

Is to create the root directory of the file into the environment variable

4. Register and bind the configuration file used

redis-server --service-install  Profile address   #  Installation services 
redis-server --service-uninstall  #  Uninstall service 

5. start-up server Program

redis-server --service-start #  start-up redis The server 
redis-server --service-stop #  stop it redis The server 

6. restart redis The server

redis Five data types

1. String String type
2. List list
3. Hash Hash guns={‘name’:‘haha’}
4. Set Unordered list
5. Zset Ordered list Default from small to large

General Command

select 2 #  Switch to 2 library   The default is 0, Optional 0-15  Yes 16 Databases 
keys * #  Query all the keys 
exists name #  Confirm whether the key exists 
type name #  View key type 
rename key newkey #  Change key name 
del name #  Delete key 
flushdb #  Empty the current library 
flushall #  Empty all libraries 

Common commands

String type

1. Database notation

#  increase 
set key value #  Create a key-value
mset key1 value1 key2 value2... #  Create multiple 
set key value ex 10 #  Set expiration date 
set key value nx #  When key non-existent , Will be deposited 

#  check 
get key #  View one key Value 
mget key1 key2.. #  obtain 
strlen key1 # obtain key length 

#  Change 
set key newvalue  #  modify key Value 
mset key1 newvalue1 key2 newvalue2..#  Multiple modifications 
#  Modify part of string , From the position 1 Start modifying characters , With asdv Cover 
setrange key 1 asdv
append key value  #  Additional 

# string There are special numbers 
incr key #  Self increasing 1
decr key #  Self reduction 1
incrby key 5 #  Self increasing  5
decrby key 5 #  Self reduction  5

2.python How to write it

import redis
# db  Do not write default is 0  No password can be left blank  host Write 127.0.0.1 hurry up 
r = redis.Redis(host='127.0.0.1',port=6379,password='123123',db=0)
r.set("name","haha")
r.mset({
    "name":"haha","age":23})

#  obtain key value 
r.get("name") #  Return string 
r.mget("name","age") #  Return value list 

#  Set expiration time 
r.set("name","haha",ex=10)
#  Created when not present 
r.set("name","haha",nx=True)

#  Get string length ,int
r.strlen("name") 

Set type ( Unordered list , unordered set )

#  increase 
sadd key value1 value2 value3

#  check 
smembers key #  Check all personnel 
scard key #  Check how many players are in the current room 
sismember key value #  Judge value Whether to join the game 

#  Change 
srem key value1 value2 #  Well value1,value2 remove 

Zset type （ Ordered set ）

#  increase 
zadd guns 30 ak47 47 dp28 100 m247

#  check 
zrange guns 0 -1 #  see guns, Sort from small to large 
zrevrange guns 0 -1 #  From big to small 

zrangebyscore guns (40 100 #  stay （40-100] Between all guns 
zrangebyscore guns 30 100 limit 2 1 withscores # 30-100 Between guns   Pagination , each page 1 strip , The third page 
zrevrangebyscore guns 100 40 #  Check the bomb capacity at （40-100] Between all guns 
zrevrangebyscore guns 100 30  limit 2 1 withscores #  Pagination , each page 1 strip , The third page 

zcard guns #  Check the number of types of guns in the system 
zcount guns (20 50 #  obtain （20-50]  The number of all guns in the interval 

zrank guns dp28 #  From small to large , View rankings  
zrevrank guns dp28 #  From big to small 

zscore guns ak47 #  Check the bomb capacity 

#  Change 
zincrby guns 20 m247 #  to m247 Gun increase 20 bullets 
zincrby guns -20 m247 #  to dp28  Reduce 20 bullets 

zrem guns ak47 ... #  Remove elements by string , Can be multiple at the same time 
zremrangebyrank guns 1 2 #  Rank according to bomb capacity  0-3  Elements in the interval are removed 
zremrangebyscore guns 0 40 #  The bomb capacity is less than 40 The hair , Delete all 

Hash type

Hash It's a string Type of field( Field ) and value( value ) The mapping table , Suitable for storing dictionaries

#  Insert   When keys and fields exist , Belongs to update 
hset key field value #  Single 
hmset key field1 value1 field2 value2 #  Multiple 

#  increase 
hincrby key field number #  Increment the integer value of the specified field 

#  check 
hget key field # Specify the value of the field 
hgetall key #  Get all fields and values 
hkeys key  # Get all fields 
hvals key   # Get all values 

#  Delete 
hdel key field1 [field2] #  Delete one or more hash fields ,  Return the number of deletions 

List type

Is a simple list of strings

#  insert 
lpush key val1 val2 #  Insert... From the left 
rpush key val1 val2 #  Insert... From the right 

#  to update 
lset key index val #  Modify the value of a subscript 

#  Delete 
lpop key #  Delete the first value on the left ,  And immediately return the value 
rpop key #  Delete the first value on the right ,  And immediately return the value 

# When the list is empty , Blocked deletion 
blpop  mylist  10
brpop mylist 10

lrem key count value #  The number of deleted items is returned , Delete the specified value 

ltrim key start stop #  Intercept data 
lrange key start stop #  Returns the content in the specified interval 
llen key  # Get the length of the list 

2. Project framework

1. Set up the virtual environment

The virtual environment will not pollute the default python Environmental Science

#  Creating a virtual environment 
python -m venv myvenv
#  Activate the virtual environment 
myvenv/Scripys/activate

In a virtual environment , Install the package used

pip install -r requirements.txt

2. establish django project

notes ：

1. Don't put the project in C disc
2. The path cannot have Chinese characters
3. edition Django 3.2.X

1. establish django project

django-admin startproject  Project name 

2. Open the project , Configure the created virtual environment

Click on add


appear venv Catalog , It means that the virtual environment is created successfully

How to enter the virtual environment
In the console

cd venv/scripts #  Get into scripts Catalog 
activate #  Activate the virtual environment 

How to exit the virtual environment

cd venv/scripts #  Get into scripts Catalog 
deactivate.bat #  Execute the exit command 

3. Configure cross domain

1. Install cross domain libraries

 pip install django-cors-header

2. Register subapplication

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'rest_framework',  # drf frame 
    'corsheaders',     #  Cross domain 
    'users',           #  Subapplication 
]

3. Register middleware

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'corsheaders.middleware.CorsMiddleware',  #  Cross domain middleware 
]

4. Setting configuration items

#  Configure cross domain related configuration items 
CORS_ORIGIN_WHITELIST = [  #  To configure ip White list 
    "http://127.0.0.1:8080",
    "http://localhost:8080",
    "http://127.0.0.1:8000",
]
CORS_ALLOW_CREDENTIALS = True  #  allow cookie
CORS_ALLOW_METHODS = ("*")     #  Configure the allowed request methods 
CORS_ALLOW_HEADERS = ("*")     #  Configure the allowed request headers 

4. Run front end projects

speak vue Drag the project to a new file , Open the little black box

npm install

function

npm run dev