Redis from getting started to forgetting

Key operation

Keys *

*: Wildcard with any number of characters

?: Pass a single character

[]: 1 characters in parentheses

Exists key exists return 1, no return 0

Type key

Rename Oldkey Newkey

Common data types:

The most commonly used data types for Redis are the following:

• String
• Hash
• List
• Set
• Sorted Set

String:

Set key value

Get key

Append key Value # Appends a string, returning the new string length

substr key start end # intercepts a string and does not modify the value of key

List:

Lpush Key Value # header added

Rpush key Value # trailing add

Llen Key # View list length

Lrange start End # View a list Lrange key 0-1 returns all data

Lpop Key # Removes elements from the left

Rpop Key # remove element from right

LSet Key index Value # Specifies subscript element

Set:

Sadd Key Member # add element

Srem Key Member # delete element

Spop Key # Delete and return elements

Sismember Key member # to determine if member is in set, return 1 means there

Sinter key1 Key2 Key3 # Returns the intersection of a given set

Sunion key1 Key2 Key3 # Returns the set of a given set

Sdiff key1 Key2 Key3 # Returns the difference set for a given set

Smembers Key # Returns all elements of the collection

Sorted set:

Zadd Key Score member # add element

Zrem Key Member # delete element

Zrange Key Start end # Returns ordered result, ascending

Zcard Key # Returns the number of elements in the collection

Zscore key Element # returns the score corresponding to the given element

Hash:

Hset key field Value # Set hash value

Hget key Field # get hash value

hexists key Field # TEST Specifies whether the field exists

Hdel key Field # Deletes the specified hash field

Hlen Key # Gets the number of domains

Hkeys Key # Get all the domain names

Hgetall # Get all domain names and values

Key design:

Users table user, convert to key-value storage:

UserID Username Password Email

9 Lisi 1111111 [email protected]

Set User:userid:9:username Lisi

Set User:userid:9:password 111111

Set user:userid:9:email [email protected]

Redis from getting started to forgetting