Redis There are five basic types ：
character string
hash
list
aggregate
Ordered set
Each different type ,Redis The client provides many different operation methods , The following will demonstrate some of the most commonly used based on Python The operation of .
Python Use pip install Redis
pip install redis
# coding:utf-8
import redis
r = redis.Redis(host='127.0.0.1', port=6379, password='') # Instantiate a redis The object comes out
def redisOperation():
**1、 String type :--Redis character string (String)**
#redis Commands related to string data types are used for management redis A string value
r.set("name","tony") # Set the specified key Value
print(r.get("name")) # Get specified key Value
r.incr("count") # take key The value of the number stored in is increased by one
print(r.get("count"))
r.decr("count") # take key Subtract one from the number stored in
print(r.get("count"))
r.delete("name") # Delete the specified key Value
**2、 Hash type ：--Redis Hash (Hash)**
# Redis hash It's a string Type of field and value Mapping table ,hash Ideal for storing objects .
r.hset("monut", "high", 2000) # Hash table key In the field field The value of the set value
r.hsetnx("mount","name","tony") # Assign value only when the field does not exist
r.hexists("mount","high") # Determine whether the key value exists
r.exists("monut") # Judge whether the key exists
r.hkeys("monut") # Get all the fields in the hash table
r.hvals("monut") # Get the values in all hash tables
r.hlen("monut") # Get the number of fields in the hash table
r.hdel("mount", "high") # Delete one or more hash table fields
print("the queue is:", r.hget('ASYNCHRONOUS_CALLBACK_QUEUE', 'myname')) # Gets the value of the specified field stored in the hash table
print("the hash is:",r.hgetall('ASYNCHRONOUS_CALLBACK_HASH')) # Gets the specified in the hash table key All fields and values of
**3、 List the type ：--Redis list (List)**
# Redis List is a simple list of strings , Sort by insertion order . You can add an element to the head of the list （ On the left ） Or tail （ On the right ）
r.lpush("list1","ok") # LPUSH Insert a value named list1 In the list of
r.lpop("list1") # Move out and get the first element of the list
r.lrange("list1",1,4) # Get the elements in the specified range of the list
r.llen("list1") # Get list length
r.rpop("list1") # Remove the last element of the list , The return value is the removed element
r.rpush("list1",1000) # RPUSH Insert a value named list1 In the list of
**4、 Collection types ：--Redis aggregate (Set)**
# Redis Of Set yes String Unordered collection of type . Collection members are unique , This means that duplicate data cannot appear in the collection .
#Redis The middle set is implemented through a hash table , So add the , Delete , The complexity of searching is O(1).
r.sadd("set1",100,188) # Add one or more members to the collection
r.sismember("set1",100) # Judge member Is the element a collection key Members of
r.srem("set1",188) # Remove one or more members of the collection
r.smembers("set1") # Returns all members of the collection
r.scard("set1") # Get the number of members of the collection
**5、 Ordered set type :--Redis Ordered set (sorted set)**
##Redis An ordered set is the same as a set string Collection of type elements , And duplicate members are not allowed .
# The difference is that each element is associated with a double Score of type .redis It's the scores that sort the members of a collection from small to large .
# Members of an ordered set are unique , But fractions (score) But it can be repeated .
# Collections are implemented through hash tables , So add the , Delete , The complexity of searching is O(1).
r.zadd("sortset",100,"mysql") # Add one or more members... To an ordered collection , Or update scores of existing members
r.zcard("sortset") # Get the number of members of the ordered set
r.zrem("sortset","mysql") # Remove one or more members of an ordered collection
r.zcount("sortset",20,100) # Calculates the number of members of a specified interval fraction in an ordered set
r.zrank("sortset","mysql") # Returns the index of a specified member in an ordered collection
r.zscore("sortset","mysql") # Back to the ordered set , The score of a member
r.zrangebyscore("sortset",10,100) # Returns an ordered set through an index interval to synthesize members in a specified interval
r.dbsize()# Returns the... Of the current database key The number of
if __name__=="__main__":
redisOperation()
1. The above source code is Python Based on a variety of Redis Operation method of data type , It is used to obtain Redis Key value specified in , along with it It supports modifying the retrieved value again The operation of .
2. In the actual testing work, we often encounter queries Redis Database data requirements , With the above operation methods , It can facilitate the work of Redis Fast query and acquisition of data .
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