Hi,
i'm investigating if clojure can be used to solve the challenges and
problems we have at my day job better than ruby or powershell. A very
common use case is validating data from different systems against some
criteria. i believe clojure can be our silver bullet, but before that, it
seems to be required to wrap my head around it.
So I am starting in the first level with the challenge to validate some
data from the user database against our active directory.
I already have all the parts to make it work: Which is to make a hash by
user_id from the database table, export a textfile from AD, each line
representing a user, parse it, merge the information from the
user_table_hash, and voila.
I did not finish to implement this. So I don't know if this naive approach
will work with 400.000 records in the user database and 100.000 in the
textfile.
But I already think about how I could implement this in a more memory
efficient way.
So my simple question:
I have user_textfile (100.000 records) which can be parsed into a unordered
list of user-maps.
I have user_table in the database(400.000 record) which I can query with
order and gives me an ordered list of user-maps.
So I would first order the user_textfile and then conj the user_table
ordered list into it, while doing the database query.
Is that approach right ? How would I then merge the two ordered lists like
in the example below?
(defn user_textfile
([:id1 {:name 'Frank'}]
[:id3 {:name 'Tim'}]))
(defn user_database
([:id1 {:age 38}]
[:id2 {:age 27}]
[:id3 {:age 18}]
[:id4 {:age 60}]))
(merge-sorted-lists user_database user_textfile)
=>
([:id1 {:name 'Frank' :age 38}]
[:id3 {:name 'Tim' :age 18}]))
Any feedback is appreciated.
Have a nice day,
Frank
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