Redis : How to set one key equal to the value of another key?
database, redis
Solution
You can do this with a Lua script:
redis.call('SET', KEYS[2], redis.call('GET', KEYS[1])); return 1;
- KEYS1 is the source key
- KEYS2 is the target key
The example below uses SCRIPT LOAD to create the script and invokes it using EVALSHA passing the following arguments:
- The SHA1 returned from the script load
- a 2 for the number of keys that will be passed
- The source key
- The target key.
Output:
redis 127.0.0.1:6379> set src.key XXX
OK
redis 127.0.0.1:6379> get src.key
"XXX"
redis 127.0.0.1:6379> SCRIPT LOAD "redis.call('SET', KEYS[2], redis.call('GET', KEYS[1])); return 1;"
"1119c244463dce1ac3a19cdd4fda744e15e02cab"
redis 127.0.0.1:6379> EVALSHA 1119c244463dce1ac3a19cdd4fda744e15e02cab 2 src.key target.key
(integer) 1
redis 127.0.0.1:6379> get target.key
"XXX"
It does appear to be a lot of stuff compared to simply doing a GET and then s SET, but once you've loaded the script (and memorized the SHA1) then you can reuse it repeatedly.
Problem
Is there any quick command in REDIS which allows me to do the following I want to set the Value of key Y equal to the value of Key X . How do I go about doing this from the Redis Client . I use the standard Redis-cli client . Basically I am looking for some equivalent of the following - ``` Y.Val() = X.Val() ```