Redis Common Command Manual: key-Value related commands

Redis provides a rich command to manipulate databases and various data types, which can be used on Linux endpoints. In programming, such as various language packs, these commands have a corresponding method. The following is a summary of the commands provided by Redis.

　　Key-Value Related commands

　　1. Keys

Returns all keys that satisfy the given pattern:

Redis 127.0.0.1:6379> Keys *

1) "Myzset2"

2) "Myzset3"

3) "MyList"

4) "Myset2"

5) "Myset3"

6) "Myset4"

7) "K_zs_1"

8) "Myset5"

9) "Myset6"

"Myset7"

One) "Myhash"

"Myzset"

"Age"

"MySet"

() "Mylist5"

() "Mylist6"

) "Mylist7"

) "Mylist8"

With the expression *, the delegate takes out all keys:

Redis 127.0.0.1:6379> Keys mylist*

1) "MyList"

2) "Mylist5"

3) "Mylist6"

4) "Mylist7"

5) "Mylist8"

Redis 127.0.0.1:6379>

With the expression mylist*, the delegate takes out all keys starting with MyList.

　　2, exists

Verify that a key exists:

Redis 127.0.0.1:6379> exists Hongwan

(integer) 0

Redis 127.0.0.1:6379> exists age

(integer) 1

Redis 127.0.0.1:6379>

The Hongwan key does not exist in the database from the result, but the age key is present.

　　3, Del

Delete a key:

Redis 127.0.0.1:6379> del Age

(integer) 1

Redis 127.0.0.1:6379> exists age

(integer) 0

Redis 127.0.0.1:6379>

The Hongwan key does not exist in the database from the result, but the age key is present.

　　4, expire

Set the expiration time (in seconds) of a key:

Redis 127.0.0.1:6379> expire Addr 10

(integer) 1

Redis 127.0.0.1:6379> TTL addr

(integer) 8

Redis 127.0.0.1:6379> TTL addr

(integer) 1

Redis 127.0.0.1:6379> TTL addr

(integer)-1

Redis 127.0.0.1:6379>

In this example, we set the expiration time for the key addr to 10 seconds, and then we constantly use the TTL to get the valid duration of the key until 1 indicates that the value has expired.

　　5. Move

Transfer the key from the current database to a different database:

Redis 127.0.0.1:6379> Select 0

Ok

Redis 127.0.0.1:6379> Set Age 30

Ok

Redis 127.0.0.1:6379> Get Age

"30"

Redis 127.0.0.1:6379> Move Age 1

(integer) 1

Redis 127.0.0.1:6379> Get Age

(nil)

Redis 127.0.0.1:6379> Select 1

Ok

Redis 127.0.0.1:6379[1]> Get Age

"30"

Redis 127.0.0.1:6379[1]>

In this example, I first explicitly selected database 0, and then set a key in this library, then we move the key from database 0 to database 1, then we confirm that there is no such key in database 0, but in database 1 there is this key, indicating that we transferred successfully

　　6, persist

To remove the expiration time for a given key:

Redis 127.0.0.1:6379[1]> expire Age 300

(integer) 1

Redis 127.0.0.1:6379[1]> TTL age

(integer) 294

Redis 127.0.0.1:6379[1]> persist Age

(integer) 1

Redis 127.0.0.1:6379[1]> TTL age

(integer)-1

Redis 127.0.0.1:6379[1]>

In this example, we manually set the key that was not the expiration time to expire successfully.

　　7, Randomkey

Randomly returns a key in the key space:

Redis 127.0.0.1:6379> Randomkey

"Mylist7"

Redis 127.0.0.1:6379> Randomkey

"Mylist5"

Redis 127.0.0.1:6379>

The result shows that the rule of key is random.

　8, rename

Rename key:

Redis 127.0.0.1:6379[1]> Keys *

1) "Age"

Redis 127.0.0.1:6379[1]> Rename Age age_new

Ok

Redis 127.0.0.1:6379[1]> Keys *

1) "Age_new"

Redis 127.0.0.1:6379[1]>

Age succeeded in renaming us to Age_new.

　　9. Type

Type of return value:

Redis 127.0.0.1:6379> Type Addr

String

Redis 127.0.0.1:6379> Type Myzset2

Zset

Redis 127.0.0.1:6379> Type MyList

List

Redis 127.0.0.1:6379>

This method can be very simple to determine the value of the type.

Redis Common Command Manual: key-Value related commands