How to use redis for database caching to improve website performance

Create and log in to the redis database. This is the commercial version, you can also build it yourself (Recommended learning: Redis video tutorial)

Set the value of the variable and set the expiration time. If the time has not expired, you can query the data

##After setting the expiration time of the variable, if the set time has passed, it cannot be queried. Generally, this feature of redis is used as the cache of the website, which can effectively reduce the storage pressure of the relational database

It does not prevent the cache from having high concurrent storage at the moment of expiration. Use setnx to cache the moment of expiration to avoid the situation

When the data is not stored, the redis value cannot be read.

If No, at this time it is necessary to pre-read it from a relational database such as mysql, save it, and re-write it, thereby realizing the mechanism of using redis as a cache

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