Redis common Commands (iv) database management, Key management, subscription publishing

# # Database Management

Keys pattern # Lookup key, parameter wildcard lookup

Keys * # View all keys

Keys N # View all keys starting with n

Keys *e # View all keys ending with E

Keys H?llo

Keys H[ae]llo

exists name # View name This key exists, exists as 1, does not exist as 0

Type key # to view the types of value corresponding to the key

Type name

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

Del addr

Rename Key Newkey # Changes the name of the key from key to Newkey, and if Newkey already exists, overwrite

Rename Num1 num3

Renamenx Key Newkey # To change the name of the key from key to Newkey, if the newkey already exists, do not do the action

Renamenx num3 num2

# sort the list, collection, and ordered collection 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 value contained by the key as a floating-point number and then sorts the floating-point numbers

Sort numbers ASC

Sort Numbers desc

Sadd names Peter Jack Tom

Sort names Alpha # Use Alpha to let sort command sort text based on dictionary 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 then returns the three values immediately following

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 is not deleted

# Scan command iterates through the entire database in a gradual manner and returns a key that matches a given pattern

# The cursor is the cursor used to traverse, the cursor must be set to 0 at the beginning of a new traverse, each time the scan is called, the command returns a new cursor value, and the scan needs to enter the entire cursor value

# match pattern is used to specify the pattern to match

# count number Specifies how many keys to return for this traversal

Scan cursor [match pattern] [count number]

Scan 0

Sscan key cursor [match pattern] [count number] # in place of the smembers command that might block the server, traversing the elements contained in the collection

Sscan names 0

Hscan key cursor [match pattern] [count number] # instead of the Hgetall command that might block the server, traverse the hash containing the individual key-value pairs

Hscan Daiby::info 0

Zscan key cursor [match pattern] [count number] # in place of the Zrange command that might block the server, traverse the individual elements contained in an ordered collection

Zscan "blog::p Aging" 0

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

FLUSHDB # Delete all key-value pairs contained in the current database

Select num # switch Database

Move Key Target-db # moves the key in the current database to the target database and does not act if the target database already has a key with the same name

Move numbers 1

Flushall # Remove Key-value pairs from all Redis databases

# Key Expiration feature

# The role of expire and pexpire is to let the key be deleted after n seconds or n milliseconds

# Expireat and Pexpireat's role is to have the key deleted after the specified Unix time arrives

Expire Key seconds # sets the lifetime of the key, in seconds, if no expiration is specified until it is removed using Del

Expire Name 5

Pexpire key milliseconds # Set key lifetime, in milliseconds, one second equals 1000 milliseconds, redis default 100 milliseconds check keys expire once

Pexpire msg 5500

Expireat key Timestamp # Set key expiration time, specify second-level UNIX timestamp

Expireat msg 100000005

Pexpireat Key Milliseconds-timestamp # Set key expiration time, specify millisecond UNIX timestamp

Pexpireat msg 100000000000005

Pttl Key # View remaining lifetime, in milliseconds

TTL Key # View remaining live time in seconds

TTL age

Persist # Delete Time to live or expire

Persist msg

Setex Key seconds Value # sets the key value and the expiration time, in seconds

Set age 5 18

Psetex key Millisecond Value # Sets the key value and expiration time, in milliseconds, equivalent to executing set and Pexpire two commands

Set Age 5000 18

# # # Publish and subscribe

Subscribe Channel [Channel ...] # Subscribe to one or more channels given

Subscribe News::it

Psubscribe pattern [pattern ...] # Subscribe to one or more patterns, the pattern parameter can contain glob style matches (*,[],?)

Psubscirbe news::[ie]t

# The behavior of the unsubscribe command is different for each client, REDIS-CLI directly out of the client to unsubscribe, Python and Ruby need to display the execution command

Unsubcribe [channel|[  Channel ...] # Unsubscribe from designated channels and unsubscribe from all subscribed channels if not specified

Punsubcribe [pattern|[  Pattern ...]] # unsubscribe from the specified mode and unsubscribe from all subscribed modes if not specified

Channels # Show subscribed channels

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

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 modes subscribed to

This article is from the "Daibayang blog" blog, make sure to keep this source http://daibaiyang119.blog.51cto.com/3145591/1964015

Redis common Commands (iv) database management, Key management, subscription publishing