redis data types and structural characteristics

Redis supports multiple data types, each type has a unique structure: string: byte array, which can append, modify and obtain range data. List: An ordered byte array sequence that can add/pop elements and get/modify index elements. Hash: A collection of key-value pairs, which can set/get/delete key-value pairs and obtain all keys/values. Set: An unordered, unique collection of elements, which can add/remove elements, obtain all elements, and find intersection/union. Ordered collection: An ordered collection of key-value pairs, which can add/delete key-value pairs, obtain key scores, and obtain range data of specified scores or keys.

Redis data types and their structural characteristics

Redis is an in-memory database that supports multiple data types , each data type has its unique structural characteristics.

String (String)

• Structure: It consists of a byte array and can store any data.

• Features:

  • Data can be appended through the APPEND command.
  • Data can be modified through the SETRANGE command.
  • You can obtain data in the specified range through the GETRANGE command.

List

• Structure: an ordered sequence of byte arrays, each element can be Arbitrary data.

• Features:

  • Elements can be added to the beginning/end of the list through the LPUSH/RPUSH command.
  • You can pop elements from the beginning/end of the list through the LPOP/RPOP command.
  • You can obtain/modify elements in the list through the LINDEX/LSET command.

Hash

• Structure: a collection of key-value pairs, where the key is a string, The value can be any data.

• Features:

  • You can set/get key-value pairs through the HSET/HGET command.
  • Key-value pairs can be deleted through the HDEL command.
  • All keys/values ​​can be obtained through the HKEYS/HVALS command.

Set

• Structure: an unordered, unique set of elements.

• Features:

  • Elements can be added/removed through the SADD/SREM command.
  • You can get all elements in the collection through the SMEMBERS command.
  • You can use the SINTER/SUNION command to find the intersection/union.

Sorted Set

• Structure: an ordered set of key-value pairs, where the key is a string and the value is a floating point fraction.

• Features:

  • You can add/delete key-value pairs through the ZADD/ZREM command.
  • The score of a key can be obtained through the ZSCORE command.
  • You can get the scores or keys in the specified range through the ZRANGE/ZREVRANGE command.

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