Node.js 错误:必须打开数据库连接才能存储文件
我正在使用mongodb atlas在云中存储数据,但我无法存储数据,因为我不断收到相同的错误 错误:必须打开数据库连接才能存储文件 我的服务器端代码Node.js 错误:必须打开数据库连接才能存储文件,node.js,mongodb,multer,gridfs,Node.js,Mongodb,Multer,Gridfs,我正在使用mongodb atlas在云中存储数据,但我无法存储数据,因为我不断收到相同的错误 错误:必须打开数据库连接才能存储文件 我的服务器端代码 const mongoURI='mongodb+srv://caman3874:qwertyuiopaman1234@@amanco pexfz.mongodb.net/test?retryWrites=true&w=maist'; const conn=mongoose.createConnection(mongoURI,{useNewUrl
const mongoURI='mongodb+srv://caman3874:qwertyuiopaman1234@@amanco pexfz.mongodb.net/test?retryWrites=true&w=maist';
const conn=mongoose.createConnection(mongoURI,{useNewUrlParser:true});
让gfs;
连接一次('打开',()=>{
gfs=网格(conn.db,mongoose.mongo);
gfs.集合(“上传”);
console.log(“连接成功”);
});
const storage=新的GridFsStorage({
网址:mongoURI,
文件:(请求,文件)=>{
返回新承诺((解决、拒绝)=>{
加密随机字节(16,(err,buf)=>{
如果(错误){
退货拒绝(err);
}
const filename=buf.toString('hex')+path.extname(file.originalname);
常量文件信息={
filename:filename,
bucketName:“上传”
};
解决(文件信息);
});
});
}
});
const upload=multer({storage});
应用程序获取(“/”,(请求,请求)=>{
res.render(“索引”);
});
app.post('/upload',upload.single('file'),(req,res)=>{
res.json({file:req.file});
});
常数端口=5000;
app.listen(端口,()=>console.log(`Server start on port${port}`));
我的html代码
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm"
crossorigin="anonymous">
</style>
<title>Mongo File Uploads</title>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-6 m-auto">
<form action="/upload" method="POST" enctype="multipart/form-data">
<div class="custom-file mb-3">
<input type="file" name="file" id="file" class="custom-file-input">
<label for="file" class="custom-file-label">Choose File</label>
</div>
<input type="submit" value="Submit" class="btn btn-primary btn-block">
</form>
</div>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin="anonymous"></script>
</body>
</html>
Mongo文件上传
选择文件
错误:必须打开数据库连接才能存储文件
位于GridFSStorage.\u handleFile(C:\Users\91807\Desktop\mongo\node\u modules\multer gridfs storage\lib\gridfs.js:339:17)
在C:\Users\91807\Desktop\mongo\node\u modules\multer\lib\make middleware.js:144:17
在allowAll(C:\Users\91807\Desktop\mongo\node\u modules\multer\index.js:8:3)
在wrappedFileFilter(C:\Users\91807\Desktop\mongo\node\u modules\multer\index.js:44:7)
在公共汽车上。(C:\Users\91807\Desktop\mongo\node\u modules\multer\lib\make middleware.js:114:7)
在Busboy.emit(events.js:209:13)
在Busboy.emit(C:\Users\91807\Desktop\mongo\node\u modules\Busboy\lib\main.js:38:33)
在PartStream。(C:\Users\91807\Desktop\mongo\node\u modules\busboy\lib\types\multipart.js:213:13)
在PartStream.emit(events.js:209:13)
在HeaderParser。(C:\Users\91807\Desktop\mongo\node\u modules\dicer\lib\dicer.js:51:16)
在HeaderParser.emit(events.js:209:13)
在HeaderParser.\u finish(C:\Users\91807\Desktop\mongo\node\u modules\dicer\lib\HeaderParser.js:68:8)
在SBMH。(C:\Users\91807\Desktop\mongo\node\u modules\dicer\lib\HeaderParser.js:40:12)
在SBMH.emit(events.js:209:13)
在SBMH.\u SBMH\u提要(C:\Users\91807\Desktop\mongo\node\u modules\streamsearch\lib\SBMH.js:159:14)
在SBMH.push(C:\Users\91807\Desktop\mongo\node\u modules\streamsearch\lib\SBMH.js:56:14)
希望这能奏效 只需创建一个promise并使用连接URI传递mongoose实例。你可能也需要统一的拓扑。
const mongoURI = 'mongodb+srv://caman3874:qwertyuiopaman1234@@amanco-pexfz.mongodb.net/test?retryWrites=true&w=majority';
const promise = mongoose.connect(mongoURI, { useNewUrlParser: true });
const conn = mongoose.connection;
let gfs;
conn.once('open',() => {
gfs = Grid(conn, mongoose.mongo);
gfs.collection('uploads');
});
//create storage object
const storage = new GridFsStorage({
db: promise,
file: (req, file) => {
return new Promise((resolve, reject) => {
crypto.randomBytes(16, (err, buf) => {
if (err) {
return reject(err);
}
const filename = buf.toString('hex') + path.extname(file.originalname);
const fileInfo = {
filename: filename,
bucketName: 'uploads'
};
resolve(fileInfo);
});
});
}
});
const upload = multer({ storage });