Nodejs mongodb 获取文档大小而不实际获取游标 [英] Nodejs mongodb fetching document size without actually fetching cursor
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问题描述
我的问题是,如何在不实际获取的情况下获得 cursor
大小(以 KB 为单位)?
My question is, how can I get a cursor
size (in KBs) without actually fetching it ?
我已经检查了很多问题,例如 here 但我不想获取查询结果以了解 KB 是多少.
I've already examined a lot of question such as here But I don't want to fetch query result to learn how much KB is it.
我只想要这样的东西:
var MongoClient = require('mongodb').MongoClient,
test = require('assert');
MongoClient.connect('mongodb://localhost:27017/test', function(err, db) {
var collection = db.collection('simple_query');
// Insert a bunch of documents for the testing
collection.insertMany([{a:1}, {a:2}, {a:3}], {w:1}, function(err, result) {
test.equal(null, err);
collection.find(/**SOME QUERY*/).size(function(err, SIZE) {
test.equal(null, err);
test.equal(32111351, SIZE); // in bytes or kilobytes whatever
db.close();
});
});
});
推荐答案
类似的事情?
var avgSize = db.collectionName.stats().avgObjSize;
// ...
collection.count(/* some query */, function(err, count) {
var approximateSize = count*avgSize; // This could work for simple database models
}
我知道它并不完美,但这是我找到的最好的方法.
I know its not perfect, but it is the best way i found.
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