Beckham _ redis key value learning, Beckham _ rediskey key value

Beckham _ redis key value learning, Beckham _ rediskey key value

Redis General (key) Type

1. What is a general key type?

2. View General commands

Iii. General examples

 

 

 

 

I. general type

It is literally translated from the word generic, so it is called the general type or attribute type. Redis is a key-value database, so it can be understood as key-specific operation instructions.

 

2. View General commands

127.0.0.1: 6379> help @ generic

 

DELkey [key...]

Summary: Delete a key

Since: 1.0.0

 

DUMP key

Summary: Return a serialized version of the value stored at thespecified key.

 

Since: 2.6.0

 

EXISTS key

Summary: Determine if a key exists

Since: 1.0.0

........

 

Iii. General examples

1. General commands

Name	Format	Description
Del	Del key key1...	Removes one or more given keys. If the key does not exist, ignore this command.
Keys	Keys *	Search for keys in the specified mode
Randomkey	Randomkey	Returns (does not delete) a random key from the current database.
Ttl	Ttl key	Returns the time to live (in seconds) of the given key ). If-1 is returned, the key does not have a life time set.
Exists	Exists key	Check whether the given key exists. If yes, 1 is returned. Otherwise, 0 is returned.
Move	Move key db	Move the key of the current database (0 by default) to the given database. If the current database (source database) and the given database (target database) have a given key with the same name, or the key does not exist in the current database, moving does not work.
Rename	Rename key newkey	If the key and newkey are the same or do not exist, an error is returned. When newkey already exists, the rename Command overwrites the old value.
Type	Type key	Return the type of the value stored in the key.
Expire	Expire key seconds	Set the survival time for the given key. When the key expires, it is automatically deleted.
Renamenx	Renamenx key newkey	If newkey does not exist, change the key to newkey.
Expireat	Expireat key timestamp	Set the survival time for the key. The time is the unconfirmed timestamp.
Persist	Persist key	Remove the survival time of a given key
Sort	Sort key [BY pattern] [LIMIT offset count] [GET pattern [GET pattern...] [ASC | DESC] [ALPHA] [STORE destination]	Returns or stores the sorted elements in the given list, set, and sorted set key. By default, numbers are used as objects for sorting. Values are interpreted as double-precision floating-point numbers and then compared.

 

2. view all current keys

127.0.0.1: 6379> keys *

1) "name"

3. view the key type

127.0.0.1: 6379> type name

String

4. delete key

127.0.0.1: 6379> del name

(Integer) 1

127.0.0.1: 6379> keys *

(Empty list or set)

5. Set the key time

127.0.0.1: 6379> set name xiaobei

OK

127.0.0.1: 6379> expire name 10

(Integer) 1

127.0.0.1: 6379> get name

"Xiaobei"

127.0.0.1: 6379> ttl name

(Integer)-2

127.0.0.1: 6379> get name

(Nil)

6. time when the key is removed

127.0.0.1: 6379> set name xiaobei

OK

127.0.0.1: 6379> expire name 3600

(Integer) 1

127.0.0.1: 6379> ttl name

(Integer) 3596

127.0.0.1: 6379> persist name

(Integer) 1

127.0.0.1: 6379> ttl name

(Integer)-1

127.0.0.1: 6379> get name

"Xiaobei"

 

7. Determine whether the key exists

127.0.0.1: 6379> exists name

(Integer) 1

127.0.0.1: 6379> exists name1

(Integer) 0

 

8. Rename the key

127.0.0.1: 6379> rename name name1

OK

127.0.0.1: 6379> keys *

1) "name1"

 

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