Is it possible to check for keys existance and increment in one command?

[S Ahmed]

Is it possible to check if a key exists, and if it does, increment it in a single command?

They important thing is, if the key does NOT exist, I want to know about that in the return value so I can take action on that fact.

[Felix Gallo]

Depends on your use case.  

INCR will return 1 if the key did not exist or if it was 0 to start with.

If you are OK with the case of the key existing and being 0 being handled the same way as the key not existing, then that will work for you.  Otherwise I'd use a lua script.

F.

On Fri, Oct 4, 2013 at 1:41 PM, S Ahmed <sahme...@gmail.com> wrote:

Is it possible to check if a key exists, and if it does, increment it in a single command?

They important thing is, if the key does NOT exist, I want to know about that in the return value so I can take action on that fact.

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[S Ahmed]

Yeah 0 isn't enough, I was hoping to get a another state back.  

NULL - didn't exist, so didn't increment

> 0 - existed, incremented

I guess lua is the only way then thanks.