mongoDB wordcount

wordcount 예제

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db.data.save({text:"read a book"}) db.data.save({text:"write a book"}) db.data.clean() db.data.remove() db.data.find() var wordmap = function(){ var line = this.text.split(" ") for(var i in line){ key = {word:line[i]} value = {count:1} emit(key,value) } } var wordreduce = function(key,values){ var totalcount = 0 for(var i in values){ totalcount = totalcount + values[i].count } return {count:totalcount} } db.data.mapReduce(wordmap,wordreduce,"dataword") db.dataword.find()