Data types and setting methods of redis

Shulou Source: shulou.com Published: 2022-06-01 11:46:17 11月08日 Update

1. Five data types supported by redis: string (string), Hash (hash), list (list), set (collection), and zset (ordered collection)

2. String is the most basic type of redis. A key can support storing 512MB at most.

Set name "lanyulei"

Del name

/ / set a key to be name, and the corresponding value to be a string of Lan Yulei

Get name

/ / result set is "lanyulei"

3. Redis hash is a mapping table of field and value of string type, and hash is especially suitable for storing objects.

Hmset user username lanyulei sex man age 25

/ / set a hash value. Key is an even-numbered form of user,value.

Each hash can store 2 to the power of 32-1, key-value pairs (more than 4 billion)

4. Redis is a simple list of strings, sorted in the order in which they are inserted, and you can add the header or tail of the element lead list.

/ / set a list type data named lanyulei, and the content is added and displayed sequentially.

Lpush lanyulei redis

Lpush lanyulei mongodb

Lpush lanyulei rabitmq

/ / to get the value,0 10 of this list "lanyulei" means to get the data before the subscript 0 to 10.

Lrange lanyulei 0 10

5. Unordered collection creation

/ / set an unordered collection

Sadd lanyulei redis

Sadd lanyulei mongodb

Sadd lanyulei mysql

/ / get the contents of this collection

Smembers lanyulei

6. Creation of ordered sets

/ / an ordered collection, like a collection, is a collection of elements of type string, and duplicate members are not allowed.

/ / the members of an ordered set are unique, but the score can be repeated.

Zadd lanyulei redis

Zadd lanyulei mongodb

Zadd lanyulei mysql

/ / get the contents of this collection

Zmembers lanyulei