This question is more about knowing what is returned after applying a
function and the best "functional programming" practices to use in
obtaining particular data in what has been returned.
So, given this program:
(ns test-csv
(:gen-class)
(:import (java.io BufferedReader FileReader StringReader))
(:use clojure-csv.core))
(defn process-file [file-name]
(with-open [br (BufferedReader. (FileReader. file-name))]
(println (parse-csv (line-seq br)))))
(defn -main [& args]
(process-file "resultset.csv"))
and this data:
"MeterID","Reading","ReadingDateTime","Account","CustomerLN","CustomerFN","DeviceID","DeviceType","ChannelNumber","DecodeType","LoadDateLocal","PremiseID"
33891715,101100,"2011-06-05 23:00:00","610160000","SMITH","E & J",
80581200,43,0,75,"2011-06-06 06:00:01","610160000"
33891773,411200,"2011-06-05 23:00:00","610159000","COMMONER","A",
80598726,43,0,75,"2011-06-06 06:00:01","610159000"
33891887,133100,"2011-06-05 23:00:00","610158000","JONES","J & M",
80581189,43,0,75,"2011-06-06 06:00:01","610158000"
33891825,239400,"2011-06-05 23:00:00","610157000","SAWTOOTH","GEORGE
C",80598731,43,0,75,"2011-06-06 06:00:01","610157000"
and running this:
cnorton@steamboy:~/projects/clojure/test_csv$ ./test-csv
This printed out:
(["MeterID","Reading","ReadingDateTime","Account","CustomerLN","CustomerFN","DeviceID","DeviceType","ChannelNumber","DecodeType","LoadDateLocal","PremiseID"33891715,101100,"2011-06-05
23:00:00","610160000","SMITH","E & J",80581200,43,0,75,"2011-06-06
06:00:01","610160000"33891773,411200,"2011-06-05
23:00:00","610159000","COMMONER","A",80598726,43,0,75,"2011-06-06
06:00:01","610159000"33891887,133100,"2011-06-05
23:00:00","610158000","JONES","J & M",80581189,43,0,75,"2011-06-06
06:00:01","610158000"33891825,239400,"2011-06-05
23:00:00","610157000","SAWTOOTH","GEORGE C",
80598731,43,0,75,"2011-06-06 06:00:01","610157000"])
cn
I have tried various ways using nth and index 0, as well as re-writing
this into a plain file/io example and using clojure.string/split at
comma boundaries, but cannot get a particular column out of each line
in the original file. All efforts so far obtain the first line in the
file and nothing else. I'm trying to figure out how to get the first
column of each line, but it might as well be the nth column of any
line.
The plain I/O method made more sense to me, because after calling map,
because it seemd a sequence of string vectors had been returned, at
least that's how it looked after printing out. The result of printing
the clojure-csv example appears to be one vector. So, I am wondering
how to use clojure-csv to parse out one or more columns in a given
line.
Thanks again for the help.
cmn
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