The technical principles and applications of hot-redis library

The technical principles and applications of hot-redis library HOT-Redis is a redis-based library. It provides a simple but efficient method for using Redis as a high-speed cache in the application.This article will introduce the technical principles of the HOT-Redis library and its usage in actual application. 1. Technical principles The main technical principle of the Hot-Redis class library is to use the durable characteristics of Redis and the rapid storage and retrieval capabilities of memory database.When the data in the application needs to perform frequent reading and writing operations, using Hot-Redis can greatly improve the access speed and performance of the data. Hot-Redis Library to achieve its efficient cache operation through the following key steps: 1. Connect the Redis database: Hot-Redis creates a connection with the Redis database by the relevant information in the configuration file.These configuration information can include the IP address, port number, password, etc. of the Redis server. 2. Memory cache management: Hot-Redis uses a memory cache area to store the frequently accessed data in memory to improve the read speed of the data.In the memory cache, the data is stored as a set of key values pairs. 3. Data storage and retrieval: When the application needs to store data, Hot-Redis first checks whether this data exists in the memory cache.If you exist, read the data and return directly from the memory; if it does not exist, store the data in the Redis database and update the memory cache. 4. Data update and deletion: When the application updates or deletes the data, Hot-Redis will simultaneously update the Redis database and memory cache to ensure the consistency and integrity of the data. 5. Calling Expired Strategy: Hot-Redis supports the expiration time of setting the cache data.When the cache time of the data exceeds the expiration time of the setting, Hot-Redis will automatically delete it from the memory cache and reload it from the Redis database at the next visit. 2. Application instance Take the Python language as an example to briefly introduce the use of the HOT-Redis class library in practical applications. 1. Install Hot-Redis Library: First of all, you need to use the PIP tool to install the Hot-Redis class library. pip install hot-redis 2. Import HOT-Redis class library: import the Hot-Redis class library in the application to use its related functions. from hot_redis import HotRedis 3. Connect the Redis database: According to the actual situation, configure the connection information of the Redis database.For example, specify the IP address, port number and password of the Redis server. hr = HotRedis(host='localhost', port=6379, password='password') 4. Storage and retrieval data: Use the method provided by the Hot-Redis library for data storage and retrieval operation.For example, use the set method to store data and use the get method to obtain data. hr.set('key', 'value') result = hr.get('key') Print (Result) # Output: Value 5. Set the cache expiration time: You can use the Expire method to set the expiration time of the cache data, the unit is second. Hr.expire ('Key', 60) # Set the cache time of 60 seconds 6. Update and delete data: Use the method provided by the HOT-Redis class library to update and delete the operation.For example, to update the data with the set method and use the delete method to delete data. hr.set ('key', 'new_value') # update data Hr.Delete ('Key') # delete data Through the above basic operations, we can use the HOT-Redis class library to easily implement Redis as a high-speed cache function in the application. Summarize: The HOT-Redis class library provides a simple and efficient cache method for applications by using Redis's durability and high-speed reading and writing ability of memory database.Its technical principles include connecting Redis database, memory cache management, data storage and retrieval, data update and deletion, and cache expiration strategies.Through the above application examples, we can understand the basic usage of the HOT-Redis class library.In actual development, according to specific needs, further development and adjustment can be made in combination with specific programming code and related configuration.