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MongoDB document insertion from a CSV stream using async.queue
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var csv = require('csv'); | |
var async = require('async'); | |
var fs = require('fs'); | |
var MongoClient = require('mongodb').MongoClient; | |
MongoClient.connect('mongodb://localhost:27017/csvdb', function(err, db) { | |
if (err) throw err; | |
var collection = db.collection('myCSVs'); | |
var queue = async.queue(collection.insert.bind(collection), 5); | |
csv() | |
.from.path('./input.csv', { columns: true }) | |
.transform(function (data, index, cb) { | |
queue.push(data, function (err, res) { | |
if (err) return cb(err); | |
cb(null, res[0]); | |
}); | |
}) | |
.on('error', function (err) { | |
console.log('ERROR: ' + err.message); | |
}) | |
.on('end', function () { | |
queue.drain = function() { | |
collection.count(function(err, count) { | |
console.log('Number of documents:', count); | |
db.close(); | |
}); | |
}; | |
}); | |
}); |
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~/tmp ❯❯❯ head input.csv | |
a,b,c | |
1,2,3 | |
4,5,6 | |
1,2,3 | |
1,2,3 | |
1,2,3 | |
1,2,3 | |
1,2,3 | |
1,2,3 | |
1,2,3 | |
~/tmp ❯❯❯ node index.js | |
Number of documents: 78360 |
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Found out what caused the trouble.It is the latest version csv 0.4.It makes use of csv as an object instead of a function.Installing version 0.3.7 helps. I did it using "npm install csv@0.3.7"