如何将带有objectId的二进制数据添加到mongoDB? [英] How to add binary data with objectId to mongoDB?
问题描述
我需要将文档插入具有ObjectId
和BinData
值的集合中.因此,我不知道如何插入它.
I need to insert a document into a collection, which has an ObjectId
and a BinData
value. Therefore I don't know how to insert it.
使用此代码,我得到错误TypeError: Cannot read property 'ObjectId' of undefined
.
With this code I get the error TypeError: Cannot read property 'ObjectId' of undefined
.
server/fixtures.js
var ObjectId = Mongo.ObjectID;
var chunk = {
"_id" : ObjectId("57a9be3c89c1e4b50c574e3a"),
"files_id": ObjectId("5113b0062be53b231f9dbc11"),
"n" : 0,
"data" : BinData(0, "/9j/4AAQSkZJRgA...and...so...on../2Q==")
};
db.mediafiles.chunks.insert(chunk);
更新
我正在使用流星
因此,我可以使用var ObjectId = Meteor.Collection.ObjectID;
.但是我怎么得到BinData
?
Therefore I can use var ObjectId = Meteor.Collection.ObjectID;
. But how do I get the BinData
?
ReferenceError: BinData is not defined
推荐答案
今天也偶然发现了这一点.
Stumbled upon this today as well.
作为提到的其他答案,您可以使用MongoDB驱动程序提供的ObjectID
和Binary
.我遇到的问题是,插入后二进制数据不是我期望的,这是由于Binary
函数的内部工作所致.它需要一个未编码的字符串或一个缓冲区,可以从base64编码的内容中初始化它,如下所示:
As the other answer mentioned you can use ObjectID
and Binary
provided by the MongoDB driver. The issue I had was that the binary data was not what I expected after inserting and this is due to the inner workings of the Binary
function. It requires either an unencoded string or a buffer, which can be initialized from base64 encoded content like this:
const { Binary, ObjectID } = require('mongodb')
async function run() {
// Configure MongoDB connection
const client = new MongoClient()
// Connect to MongoDB
await client.connect(...)
try {
// Insert data using base64 encoded content and
// both ObjectID and Binary from mongodb package
await client.db().mediafiles.chunks.insert({
_id: ObjectID('57a9be3c89c1e4b50c574e3a'),
files_id: ObjectID('5113b0062be53b231f9dbc11'),
n: 0,
data: Binary(Buffer.from('/9j/4AAQSkZJRgA...and...so...on../2Q==', 'base64')),
})
} finally {
// Close client if it was opened
await client.close()
}
}
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