Re: [Haskell-cafe] Harder than you'd think

Marc Weber wrote:

...

Does anybody have a less-insane way of doing this?

Sure:

type MyMap = Map (KeyID, Key) Value

Don't use multiple keys. Put the keys into a tuple and use that as key.

Let me know whether this is what you were looking for.

Trouble is, this requires you to have *all* the keys to perform a single lookup. You can't do a lookup on just one attribute.

I tried writing something like this. Yet SQL gives all this stiff for free.

[Except that SQL bindings don't work on Windows. Besides, I'm only working with small data volumes, I don't need persistence or transaction guarantees, etc.]

I still wonder which is the nicest way to express this data in Haskell without coding everything yourself..

Indeed.