How to use five data types of redis

Redis provides five data types: String: stores a single string value. Hash table: stores key-value pairs, used for objects or maps. List: Stores an ordered sequence of elements, used in arrays or queues. Collection: stores unique elements, used for unique values or labels. Sorted set: stores elements with fractions, sorted by fraction from low to high.

How to use Redis’s five data types

Redis is an in-memory data structure storage that provides five basic data types , each type has unique properties and uses.

1. String (String)

Purpose:Stores a single string value, used to store simple text, numbers or JSON strings.

Usage:

# 设置字符串值 SET my_string "Hello World" # 获取字符串值 GET my_string

2. Hash table (Hash)

Purpose:Store key-value pairs, use For storing objects or mappings.

Usage:

# 设置哈希表值 HSET my_hash field1 "value1" HSET my_hash field2 "value2" # 获取哈希表值 HGET my_hash field1

3. List

Purpose:To store an ordered sequence of elements, use For storing arrays or queues.

Usage:

# 入队到列表 LPUSH my_list element1 LPUSH my_list element2 # 出队元素 LPOP my_list

4. Set

Purpose:Stores unique elements for Store a unique value or label.

Usage:

# 添加元素到集合 SADD my_set element1 SADD my_set element2 # 检查元素是否存在 SISMEMBER my_set element1

5. Sorted Set

Usage:Store elements with fractions , sorted by scores from small to large, used to store rankings or priority queues.

Usage:

# 添加元素到有序集合，并指定分数 ZADD my_sorted_set 10 element1 ZADD my_sorted_set 20 element2 # 获取分数为 10 的元素 ZRANGEBYSCORE my_sorted_set 10 10

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