Hello All,

I would like to query based on an incoming hash (with help of json
library), but I don't see a built-in way to generate query needed. There is
a rows->dict but I don't see either a dict->where-clause or at least
whatever query uses in that dollar sign magic to convert
Racket-val->SQL-string.

Currently I have a function which takes a hash and makes "<col1>=$1
<boolean> <col2>=$2..." so I can then do something like (apply query <the
above string> <the vals returned by that same function as it built that
string>). It would be nice and probably more efficient if the value could
just be spliced in while I build the string to begin with, but it seems
like only query has such dollar sign conversion power available.

Am I missing something?
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