Setting multiple keys in Redis through Lua

user_4591240 0
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I'm looking for an INSERT script counterpart in Redis where I want to set multiple keys at once.

SET foo bar
SET sun moon
SET fire water
...

How would a Lua script for the above look like as I couldn't find much help online.

redis lua
1 Answers

For a Lua script, I would do something like so:

for i=1, #KEYS do
    redis.call("SET", KEYS[i], ARGV[i])
end

Which in execution, would look like this:

EVAL 'for i=1, #KEYS do redis.call("SET", KEYS[i], ARGV[i]) end' 2 key1 key2 val1 val2

Note that #KEYS is not dynamically calculated, but rather the explicitly passed numkeys argument.

Additional validation could be added as necessary—asserting equal numbers of keys and args, for example—but I would strongly encourage doing most of that sanity checking client-side for performance.

If not using Lua, Redis has the command MSET to set multiple keys at once natively.

https://redis.io/commands/mset

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