Redis Operation command for key

Del key1 Key2 ... Keyn

Action: Delete 1 or more keys

Return value: The nonexistent key is ignored, returning the number of really deleted keys

Rename Key Newkey

Function: Assign a new key name to the key

Note: If Newkey already exists, the original value of Newkey is overwritten

Function: Rename key to Newkey

Return: The modification returned 1, no modification returned 0

Note: Nx--> not exists, that is, when Newkey does not exist, make a name change action

Move Key db

Redis 127.0.0.1:6379[1]> Select 2

Ok

Redis 127.0.0.1:6379[2]> Keys *

(empty list or set)

Redis 127.0.0.1:6379[2]> Select 0

Ok

Redis 127.0.0.1:6379> Keys *

1) "Name"

2) "CC"

3) "A"

4) "B"

Redis 127.0.0.1:6379> Move cc 2

(integer) 1

Redis 127.0.0.1:6379> Select 2

Ok

Redis 127.0.0.1:6379[2]> Keys *

1) "CC"

Redis 127.0.0.1:6379[2]> Get CC

"3"

(Note: A Redis process that opens more than one database, opens 16 databases by default, numbering from 0 to 15 , can be modified from a configuration file if you want to open more databases)

Keys pattern query the corresponding key

In Redis, allow fuzzy query key

There are 3 wildcard characters *,? ,[]

*: Wildcard with any number of characters

?: Pass a single character

[]: 1 characters in parentheses

Redis 127.0.0.1:6379> Flushdb

Ok

Redis 127.0.0.1:6379> Keys *

(empty list or set)

Redis 127.0.0.1:6379> Mset One 1 2 three 3 four 4

Ok

Redis 127.0.0.1:6379> Keys o*

1) "One"

Redis 127.0.0.1:6379> Key *o

(Error) ERR unknown command ' key '

Redis 127.0.0.1:6379> Keys *o

1) "Both"

Redis 127.0.0.1:6379> Keys???

1) "One"

2) "Both"

Redis 127.0.0.1:6379> keys on?

1) "One"

Redis 127.0.0.1:6379> Set ONS yes

Ok

Redis 127.0.0.1:6379> Keys ON[EAW]

1) "One"

Randomkey return random Key

Exists key

Determine if key exists, return 1/0

Type key

Returns the type of value stored by key

Have String,link,set,order set, hash

TTL key

Role: Querying the life cycle of a key

Return: Number of seconds

Note: For nonexistent key or expired key/key, all returns-1

Redis2.8, for a nonexistent key, return-2

Expire key Integral type value

Function: Sets the lifecycle of a key in seconds

Similarly:

Pexpire key milliseconds, setting life cycle

Pttl key, returns the life cycle in milliseconds

Persist key

Function: The specified key is permanently active

Redis action command for key