Bulk create in Meteor | 易学教程

问题

I need to create 2000 documents at once in Meteor. I know I can use

for (i=0; i<2000; i++) {
    CollectionName.insert({});
}

but I hope there is a bulk create function in Meteor. How can I insert these 2000 rows in the fastest way possible?

回答1:

Meteor doesn't natively support this. However, it does give you access to the node Mongodb driver which can natively do a bulk insert.

You can only do this on the server:

var x = new Mongo.Collection("xxx");

x.rawCollection.insert([doc1, doc2, doc3...], function(err, result) {
    console.log(err, result)
});

Or with MongoDB 2.6 if your Meteor instance has access to it:

var bulk = x.initializeUnorderedBulkOp();

bulk.insert( { _id: 1, item: "abc123", status: "A", soldQty: 5000 } );
bulk.insert( { _id: 2, item: "abc456", status: "A", soldQty: 150 } );
bulk.insert( { _id: 3, item: "abc789", status: "P", soldQty: 0 } );
bulk.execute( { w: "majority", wtimeout: 5000 } );

Notes:

This is not synchronous or isn't run in a fiber as it uses the raw node driver. You need to use Meteor.bindEnvironment or Meteor.wrapAsync to create synchronous code
The documents are inserted unordered and may not be in the original order you added them in.
It may take 10 seconds for Meteor to see the documents 'Reactively' through a publish method if your instance is not oplog enabled.

回答2:

Extending @Akshat's answer, this is the syntax that would work on Meteor 1.0+

x = new Mongo.Collection("x");
var bulk = x.rawCollection().initializeUnorderedBulkOp();

bulk.insert( { _id: 1, item: "abc123", status: "A", soldQty: 5000 } );
bulk.insert( { _id: 2, item: "abc456", status: "A", soldQty: 150 } );
bulk.insert( { _id: 3, item: "abc789", status: "P", soldQty: 0 } );

Meteor.wrapAsync(bulk.execute)();

回答3:

Here's what I use:

/server/fixtures.js

var insertIntoCollection = function(collection, dataArray){
  dataArray.forEach(function(item){
    collection.insert(item);
  });
};

if (Stuff.find().count() === 0) {

  var array = [
    { 
      // document1
    },{
      // document2
    }
  ];

  insertIntoCollection(Stuff, array);
};

来源：https://stackoverflow.com/questions/31131127/bulk-create-in-meteor

标签

javascript

node.js

mongodb

meteor