tutorials

Syntax

Redis strings commands are used for managing string values in redis. Syntax for using redis string commands is shown below:

redis 127.0.0.1:6379> COMMAND KEY_NAME
redis 127.0.0.1:6379> SET tutorialspoint redis
OK
redis 127.0.0.1:6379> GET tutorialspoint
"redis"

SET key value

This command sets the value at the specified key

In SET command there are many options available, that modify the behaviour of command. Basic syntax of SET command with available options is shown below:
redis 127.0.0.1:6379> SET KEY VALUE [EX seconds] [PX milliseconds] [NX|XX]

EX seconds - Set the specified expire time, in seconds.

PX milliseconds - Set the specified expire time, in milliseconds.

NX - Only set the key if it does not already exist.

XX - Only set the key if it already exist.

Above example will set the key tutorialspoint, with expiry of 60 seconds, if the key does not exist.

GET key

Get the value of a key.

GETRANGE key start end

Get a substring of the string stored at a key

redis 127.0.0.1:6379> SET mykey "This is my test key"
OK
redis 127.0.0.1:6379> GETRANGE mykey 0 3
"This"
redis 127.0.0.1:6379> GETRANGE mykey 0 -1
"This is my test key"

GETSET key value

Set the string value of a key and return its old value

Simple string reply, old value of key. If key does not exist, then nil is returned.
redis 127.0.0.1:6379> GETSET mynewkey "This is my test key"
(nil)
redis 127.0.0.1:6379> GETSET mynewkey "This is my new value to test getset"
"This is my test key"

GETBIT key offset

Returns the bit value at offset in the string value stored at key

MGET key1 [key2…]

Get the values of all the given keys

redis 127.0.0.1:6379> SET key1 "hello"
OK
redis 127.0.0.1:6379> SET key2 "world"
OK
redis 127.0.0.1:6379> MGET key1 key2 someOtherKey
1) "Hello"
2) "World"
3) (nil)

SETBIT key offset value

Sets or clears the bit at offset in the string value stored at key

redis 127.0.0.1:6379> SETBIT mykey 7 1
(integer) 0
redis 127.0.0.1:6379> GETBIT mykey 0
(integer) 0
redis 127.0.0.1:6379> GETBIT mykey 7
(integer) 1
redis 127.0.0.1:6379> GETBIT mykey 100
(integer) 0

SETEX key seconds value

Set the value with expiry of a key

Simple string reply. OK, if value is set in key or Null, if value does not set.

redis 127.0.0.1:6379> SETEX mykey 60 redis
OK
redis 127.0.0.1:6379> TTL mykey
60
redis 127.0.0.1:6379> GET mykey
"redis

SETNX key value

Set the value of a key, only if the key does not exist

1, if the key is set.

0, if the key is not set.

redis 127.0.0.1:6379> SETNX mykey redis
(integer) 1
redis 127.0.0.1:6379> SETNX mykey mongodb
(integer) 0
redis 127.0.0.1:6379> GET mykey
"redis"

SETRANGE key offset value

Overwrite part of a string at key starting at the specified offset

Integer reply, the length of the string after it was modified by the command.

redis 127.0.0.1:6379> SET key1 "Hello World"
OK
redis 127.0.0.1:6379> SETRANGE key1 6 "Redis"
(integer) 11
redis 127.0.0.1:6379> GET key1
"Hello Redis"

STRLEN key

Get the length of the value stored in a key

MSET key value [key value …]

Set multiple keys to multiple values

redis 127.0.0.1:6379> MSET key1 "Hello" key2 "World"
OK
redis 127.0.0.1:6379> GET key1
"Hello"
redis 127.0.0.1:6379> GET key2
1) "World"

MSETNX key value [key value …]

Set multiple keys to multiple values, only if none of the keys exist

1, if all keys are set in redis

0, if no keys are set in redis

redis 127.0.0.1:6379> MSETNX key1 "Hello" key2 "world"
(integer) 1
redis 127.0.0.1:6379> MSETNX key2 "worlds" key3 "third key"
(integer) 0
redis 127.0.0.1:6379> MGET key1 key2 key3
1) "Hello"
2) "world"
3) (nil)

PSETEX key milliseconds value

Set the value and expiration in milliseconds of a key

redis 127.0.0.1:6379> PSETEX mykey 1000 "Hello"
OK
redis 127.0.0.1:6379> PTTL mykey
999
redis 127.0.0.1:6379> GET mykey
1) "Hello"

INCR key

Increment the integer value of a key by one

redis 127.0.0.1:6379> SET visitors 1000
OK
redis 127.0.0.1:6379> INCR visitors
(integer) 1001
redis 127.0.0.1:6379> GET visitors
(integer) 1001

INCRBY key increment

Increment the integer value of a key by the given amount

redis 127.0.0.1:6379> SET visitors 1000
OK
redis 127.0.0.1:6379> INCRBY visitors 5
(integer) 1005
redis 127.0.0.1:6379> GET visitors
(integer) 1005

INCRBYFLOAT key increment

Increment the float value of a key by the given amount

redis 127.0.0.1:6379> SET visitors 1000.20
OK
redis 127.0.0.1:6379> INCRBYFLOAT visitors .50
1000.70
redis 127.0.0.1:6379> GET visitors
1000.70

DECR key

Decrement the integer value of a key by one, contruy

DECRBY key decrement

Decrement the integer value of a key by the given number

redis 127.0.0.1:6379> SET visitors 1000
OK
redis 127.0.0.1:6379> DECRBY visitors 5
(integer) 995

APPEND key value

Append a value to a key

redis 127.0.0.1:6379> SET mykey "hello"
OK
redis 127.0.0.1:6379> APPEND mykey " tutorialspoint"
(integer) 20
redis 127.0.0.1:6379> GET mykey 
"hello tutorialspoint"

Syntax

Related Commands