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PO
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Id
1280106
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0
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0
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0
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CreationDate
2009-08-14T20:42:38.287
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0
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2009-08-14T22:45:40.580
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2009-08-14T22:45:40.580
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128927
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128927
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1276613
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2
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3
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text
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<p>Here is my stab at a functional-ish approach to the problem:</p> <ul> <li>Create 2 maps, one for each file</li> <li>Find the missing items between the two maps, using <code>dissoc</code></li> <li>Find the different, but shared items between the two maps, using <code>intersection</code> and <code>filter</code></li> </ul> <h2>Code</h2> <pre><code>(ns diffset (:use [clojure.contrib.duck-streams] [clojure.set])) (def file1 "bookmarks.csv") (def file2 "bookmarks2.csv") (defn split-record [line] "split line into (id, bookmark)" (map #(apply str %) (split-with #(not (= % \|)) line))) (defn map-from-file [f] "create initial map from file f" (with-open [r (reader f)] (doall (apply hash-map (apply concat (map split-record (line-seq r))))))) (defn missing [x y] "return seq of all ids in x that are not in y" (keys (apply dissoc x (keys y)))) (defn different [x y] "return seq of all ids that match but have different bookmark string" (let [match-keys (intersection (set (keys x)) (set (keys y)))] (filter #(not (= (get x %) (get y %))) match-keys))) (defn diff [file1 file2] "print out differences between two bookmark files" (let [[s1 s2] (map map-from-file [file1 file2])] (dorun (map #(println (format "Id #%s is missing in set #1" %)) (missing s2 s1))) (dorun (map #(println (format "Id #%s is missing in set #2" %)) (missing s1 s2))) (dorun (map #(println (format "Id #%s is different:" %) "\n" " ->" (get s1 %) "\n" " ->" (get s2 %)) (different s1 s2))))) </code></pre> <h2>Result</h2> <pre><code>user> (use 'diffset) nil user> (diff file1 file2) Id #1 is missing in set #1 Id #5 is missing in set #2 Id #3 is different: -> |www.msnbc.com|Search| -> |www.msnbc.com|Search|New Comment nil </code></pre>
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1. POHow can I find the difference in 2 data sets?
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