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:

<code># 设置字符串值
SET my_string "Hello World"

# 获取字符串值
GET my_string</code>

2. Hash table (Hash)

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

Usage:

<code># 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</code>

3. List

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

Usage:

<code># 入队到列表
LPUSH my_list element1
LPUSH my_list element2

# 出队元素
LPOP my_list</code>

4. Set

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

Usage:

<code># 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</code>

5. Sorted Set

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

Usage:

<code># 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</code>

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