SET key value

Syntax

SET key value [EX seconds] [PX milliseconds] [NX|XX]

     Sets the value to the key. There are multiple options available for SET command.

Without options

127.0.0.1:6379> set a 10 
OK 
127.0.0.1:6379> get a 
"10"

EX seconds

Sets the expire time of this key in seconds.

127.0.0.1:6379> set a 10 ex 5 
OK 
127.0.0.1:6379> get a 
(nil) 

 

When i call get command after 5 seconds, it returns nil.

PX milliseconds

Sets the specified expiry time in milliseconds.

127.0.0.1:6379> set a 10 px 5000 
OK 
127.0.0.1:6379> get a 
(nil) 

When i call get command after 5 seconds, it returns nil.

NX

Sets only if key not exist.

127.0.0.1:6379> set a 10 nx 
OK 
127.0.0.1:6379> get a 
"10" 
127.0.0.1:6379> set b 10 
OK 
127.0.0.1:6379> set b 20 nx 
(nil) 
127.0.0.1:6379> get b 
"10" 

  

XX

Sets only, if key already exists.

127.0.0.1:6379> set c 10 xx 
(nil) 
127.0.0.1:6379> set d 10 
OK 
127.0.0.1:6379> set d 20 xx 
OK 

 

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