STRING-REDIS.md

Cli Commands

• String Data Structure
  • 1.1. set name
  • 1.2. get name
  • 1.3. setnx
  • 1.4. MSET
  • 1.5. MGET
  • 1.6. INCR
  • 1.7. INCRBY
  • 1.8. GETRANGE
  • 1.9. SETRANGE
  • 1.10. GETRANGE
  • 1.11. STRLEN
  • 1.12. APPEND
  • 1.13. SETEX
  • 1.14. SETNX
  • 1.15. MSETNX
  • 1.16. SETRANGE
  • 1.17. GETRANGE
  • 1.18. STRLEN
  • 1.19. DECR
  • 1.20. DECRBY
  • 1.23. PSETEX

1.1.set name

Type set name "subham" to set a key-value pair in the Redis server.

1.2.get name

Type get name to retrieve the value of the key from the Redis server.

Note: If you open your Redis stack in the browser, you will see the key and value set. You can also update the value from there. Just click on the key and update the value on the right side. The Best way to do this is

set user:1 "subham"

set user:2 "codexam"

set user:3 "xamcodexam"

set msg:1 "hello"

set msg:2 "hi"

set msg:3 "hey"

If you group on the redis-stack you will see the data like this

user
    1: "subham"
    2: "codexam"
    3: "xamcodexam"

msg
    1: "hello"
    2: "hi"
    3: "hey"

1.3.setnx

set if not exists(nx)

set user:1 "subham" nx

if you don't use nx, then it will overwrite the value

set user:1 "codexam"

1.4.MSET

set multiple values

mset user:1 "subham" user:2 "codexam" msg:1 "hello" msg:2 "hi"

1.5.MGET

get multiple values

mget user:1 user:2 msg:1 msg:2

1) "subham"
2) "codexam"
3) "hello"
4) "hi"

1.6.INCR

increment the value by 1

set user:1 10

incr user:1

(integer) 11

1.7.INCRBY

increment the value by 5

set user:1 10

incrby user:1 5

(integer) 15

Note: By default a single Redis string can be a maximum of 512MB in size.

1.8.GETRANGE

get the value from the range(SUBSTRING)

set user:1 "subham"

getrange user:1 0 3

"subh"

1.9.SETRANGE

set the value from the range(SUBSTRING)

set user:1 "subham"

setrange user:1 0 "codexam"

(integer) 7

get user:1

"codexam"

1.10.GETRANGE

get the value from the range(SUBSTRING)

set user:1 "subham"

getrange user:1 0 3

"subh"

1.11.STRLEN

get the length of the value

set user:1 "subham"

strlen user:1

(integer) 6

1.12.APPEND

append the value

set user:1 "subham"

append user:1 " codexam"

(integer) 14

get user:1

"subham codexam"

1.13.SETEX

set the value with expiration time (in seconds)

setex user:1 10 "subham"

(integer) 1

get user:1

"subham"

get user:1

(nil)

1.14.SETNX

set the value if the key doesn't exist

setnx user:1 "subham"

(integer) 1

get user:1

"subham"

setnx user:1 "codexam"

(integer) 0

get user:1

"subham"

1.15.MSETNX

set multiple values if the key doesn't exist

msetnx user:1 "subham" user:2 "codexam" msg:1 "hello" msg:2 "hi"


(integer) 1

get user:1

"subham"

get user:2

"codexam"

get msg:1

"hello"

get msg:2

"hi"

1.16.SETRANGE

set the value from the range(SUBSTRING)

set user:1 "subham"

setrange user:1 0 "codexam"

(integer) 7

get user:1

"codexam"

1.17.GETRANGE

get the value from the range(SUBSTRING)

set user:1 "subham"

getrange user:1 0 3

"subh"

1.18.STRLEN

get the length of the value

set user:1 "subham"

strlen user:1

(integer) 6

1.19.DECR

This command decreases the value of a key by 1. If the key does not exist, it is set to -1.

set user:1 10

decr user:1

(integer) 9

1.20.DECRBY

This command decreases the value of a key by the given number. If the key does not exist, it is set to negative the given number.

set user:1 10

decrby user:1 5

(integer) 5

1.21.PSETEX

This command sets the value and expiration in milliseconds of a key.

psetex user:1 10000 "subham"

(integer) 1

get user:1

"subham"

get user:1

(nil)