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This article will explain in detail what commands are commonly used in Redis. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Redis provides a wealth of commands (command) to operate on databases and various data types, and these command can be used on Linux terminals. When programming, such as various language packs, these commands have corresponding methods.

1 、 keys

Returns all key that satisfy a given pattern:

Redis 127.0.0.1 6379 > keys *

"myzset2"

"myzset3"

"mylist"

"myset2"

"myset3"

"myset4"

"k_zs_1"

"myset5"

"myset6"

"myset7"

"myhash"

"myzset"

"age"

"myset"

"mylist5"

"mylist6"

"mylist7"

"mylist8"

Use the expression * to take out all the key:

Redis 127.0.0.1 6379 > keys mylist*

1) "mylist"

2) "mylist5"

3) "mylist6"

4) "mylist7"

5) "mylist8"

Redis 127.0.0.1 purl 6379 >

Use the expression mylist*, to take out all key that begin with mylist.

2 、 exists

Confirm 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 purl 6379 >

As a result, the key of HongWan does not exist in the database, but the key of age exists.

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 purl 6379 >

As a result, the key of HongWan does not exist in the database, but the key of age exists.

4 、 expire

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

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 purl 6379 >

In this example, we set the expiration time of the addr key to 10 seconds, and then we keep using ttl to get the valid duration of the key until a value of-1 indicates that the value has expired.

What are the common commands in Redis

5 、 move

Transfer the key from the current database to another 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 redis [1] > get age

"30"

Redis 127.0.0.1 6379 [1] >

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

6 、 persist

Remove the expiration time of a given key:

Redis 127.0.0.1 expire age 6379 [1]

(integer) 1

Redis 127.0.0.1 redis [1] > ttl age

(integer) 294

Redis 127.0.0.1 redis [1] > persist age

(integer) 1

Redis 127.0.0.1 redis [1] > ttl age

(integer)-1

Redis 127.0.0.1 6379 [1] >

In this example, we manually set the key before the expiration time to expire successfully.

7 、 randomkey

Randomly returns a key of the key space:

Redis 127.0.0.1 6379 > randomkey

"mylist7"

Redis 127.0.0.1 6379 > randomkey

"mylist5"

Redis 127.0.0.1 purl 6379 >

From the results, we can see that the rule of fetching key is random.

8 、 rename

Rename key:

Redis 127.0.0.1 6379 [1] > keys

1) "age"

Redis 127.0.0.1 redis [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 was successfully renamed age_new by us.

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 purl 6379 >

This method can easily determine the type of value.

This is the end of this article on "which commands are commonly used in Redis". I hope the above content can be helpful to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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