Shulou(Shulou.com)06/01 Report--

# Database Management

Keys pattern # lookup key, parameter wildcard lookup

Keys * # View all keys

Keys n * # View all keys that start with n

Keys * e # View all keys ending in e

Keys h?llo

Keys h[ae] llo

Exists name # check whether the key name exists. If it exists, it is 1. If it does not exist, it is 0.

Type key # check the type of value corresponding to the key

Type name

Del key1 key2... # Delete key and its corresponding value

Del addr

Rename key newkey # changes the name of the key from key to newkey, and overrides if newkey already exists

Rename num1 num3

Renamenx key newkey # changes the name of the key from key to newkey, and does not take action if newkey already exists

Renamenx num3 num2

# sort lists, collections, and ordered collections by calling the sort command

Sort key [by pattern] [limit offset count] [get pattern [get pattern]] [asc | desc] [alpha] [store destination]

Rpush numbers 9 5 1 3 2

Sort numbers # by default the sort command interprets the values contained in the key as floating-point numbers, and then sorts the floating-point numbers

Sort numbers asc

Sort numbers desc

Sadd names peter jack tom

Sort names alpha # uses alpha to have the sort command sort text based on lexicographic order

Sort numbers limit 0 3 # does not skip any values and returns the first three values

Sort numbers limit 3 3 # escapes the first three values and returns the next three values

Sort numbers store sorted-numbers # by specifying store destkey, we store the sorting results in destkey, and the sorted results are stored as a list

Randomkey # randomly returns a key from the current database, and the returned key will not be deleted

The # scan command progressively traverses the entire database multiple times and returns keys that match a given pattern

# cursor is a cursor used for traversal. To start a new traversal, you need to set cursor to 0. Every time you call scan, the command returns a new cursor value. To call scan again, you need to enter the entire cursor value.

# match pattern is used to specify the pattern to match

# count number specifies the maximum number of keys to be returned for this traversal

Scan cursor [match pattern] [count number]

Scan 0

Sscan key cursor [match pattern] [count number] # traverses the elements contained in the collection instead of the smembers command that may block the server

Sscan names 0

Hscan key cursor [match pattern] [count number] # traverses the key-value pairs contained in the hash instead of the hgetall command that may block the server

Hscan daiby::info 0

Zscan key cursor [match pattern] [count number] # traverses the elements contained in an ordered collection instead of the zrange command that may block the server

Zscan "blog::paging" 0

Dbsize # returns the number of key-value pairs currently contained in the database

Flushdb # deletes all key-value pairs contained in the current database

Select num # switching databases

Move key target-db # moves the key in the current database to the target database. If the target database already has a key with the same name, no action will be taken.

Move numbers 1

Flushall # Delete key-value pairs in all redis databases

# key expiration function

The function of # expire and pexpire is to make the key be deleted after N seconds or N milliseconds

The function of # expireat and pexpireat is to delete the key after the specified Unix time arrives.

Expire key seconds # sets the key lifetime in seconds. If no expiration time is specified, it persists until it is removed using DEL

Expire name 5

Pexpire key milliseconds # sets the key lifetime in milliseconds. One second equals 1000 milliseconds. By default, redis checks whether the key expires at a time.

Pexpire msg 5500

Expireat key timestamp # sets the expiration time of the key and specifies the second Unix timestamp

Expireat msg 100000005

Pexpireat key milliseconds-timestamp # sets the key expiration time and specifies the millisecond Unix timestamp

Pexpireat msg 100000000000005

Pttl key # View remaining time to live in milliseconds

Ttl key # View the remaining time to live in seconds

Ttl age

Persist # Delete time to live or expire

Persist msg

Setex key seconds value # sets key value and expiration time in seconds

Set age 5 18

Psetex key millisecond value # sets the key value and expiration time in milliseconds, which is equivalent to executing the set and pexpire commands

Set age 5000 18

# publish and subscribe

Subscribe channel [channel...] # subscribe to a given channel or channels

Subscribe news::it

Psubscribe pattern [pattern...] # subscribes to one or more modes, and the pattern parameter can contain glob-style matches (*, [],?)

Psubscirbe news:: [ie] t

# the behavior of the unsubscription command varies from client to client. Redis-cli exits the client directly to unsubscribe, while Python and ruby need to display the execution command.

Unsubcribe [channel | [channel...]] # unsubscribe to the specified channel, or unsubscribe to all subscribed channels if not specified

Punsubcribe [pattern | [pattern...]] # Unsubscribe the specified mode, or unsubscribe all subscribed modes if no one is specified

Channels # displays subscribed channels

Publish channel message # sends the message to the specified channel, and the command returns the number of subscribers who have received the message

Pubsub channels [pattern] # lists channels with at least one subscriber

Pubsub numsub [channel...] # returns the number of subscribers for a given channel

Pubsub numpat # returns the number of patterns subscribed to

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