Mongodb 如何指定GridFS存储桶?
这是我的express.js代码,用于将文件上载和下载到GridFS:Mongodb 如何指定GridFS存储桶?,mongodb,gridfs,bucket,Mongodb,Gridfs,Bucket,这是我的express.js代码,用于将文件上载和下载到GridFS: var fs = require("fs"); var gridStream = require("gridfs-stream"); var mongoose = require("mongoose"); exports.init = function(app, db) { var grid = gridStream(db, mongoose.mongo); app.post("/UploadFile",
var fs = require("fs");
var gridStream = require("gridfs-stream");
var mongoose = require("mongoose");
exports.init = function(app, db)
{
var grid = gridStream(db, mongoose.mongo);
app.post("/UploadFile", function(request, response)
{
var file = request.files.UploadedFile;
var meta = request.param("Meta");
var name = request.param("Name");
var stream = grid.createWriteStream(
{
filename: name,
metadata: meta
});
fs.createReadStream(file.path)
.on("end", function()
{
response.send({ Success: true });
})
.on("Error", function(error)
{
HandleError(error, response);
})
.pipe(stream);
});
app.get("/DownloadFile", function(request, response)
{
var selector = request.param("Selector");
response.writeHead(200, { "Content-Type" : "image/png"});
grid.createReadStream({ filename: "FileUploadNamed" }).pipe(response);
});
}
它工作得很好,但我想指定一个读写的bucket,但我不确定如何做到这一点。我在网上看到过调用GridFS构造函数的例子,但正如您所看到的,我在这里没有这样做。文档还说可以提供不同的bucket名称,但我没有看到任何关于如何提供的内容
如何选择将文件保存到哪个bucket并从中读取?这在gridfs stream或它使用的底层本机mongodb驱动程序中没有很好的说明,但下面是如何做到的: 下面是gridfs流
createWriteStream
中的选项对象(请注意根
选项):
工作原理:
gridfs流通过选项
对象,您将调用createWriteStream
或createReadStream
传递给底层mongodb驱动程序,以创建表示文件的gridStore
对象。mongodb驱动程序反过来替代默认的“fs”网格存储桶前缀字符串
{
_id: '50e03d29edfdc00d34000001',
filename: 'my_file.txt',
mode: 'w',
chunkSize: 1024,
content_type: 'plain/text',
root: 'my_collection', // Bucket will be 'my_collection' instead of 'fs'
metadata: {
...
}
}