blob

I'm looking for a way to stream binary data to/from database. If possible, i'd like it to be done with Hibernate (in database agnostic way). All solutions I've found involve explicit or implicit loading of binary data into memory as byte[]. I need to avoid it. Let's say I want my code to be able to write to a local file a 2GB video from database (stored in BLOB column), or the other way around, using no more than 256Mb of memory. It's clearly achievable, and involves no voodoo. But I can't find a way, for now I'm trying to avoid debugging Hibernate. Let's look at sample code (keeping in mind

I have some files stored in a database blob column in Oracle 9. I would like to have those files stored in the file system. This should be pretty easy, but I don't find the right snipped. How can I do this in java? PreparedStatement ptmst = ... ResutlSet rs = pstmt.executeQuery(); rs.getBlob(); // mistery FileOutputStream out = new FileOutputStream(); out.write(); // etc et c I know it should be something like that... what I don't know is what is commented as mistery Thanks EDIT I finally got this derived from David's question. This is my lazy implementation: PreparedStatement pstmt =

I want to open a PDF in a new tab in chrome browser (Chrome 56.0.2924.87, Ubuntu 14.04) using window.open(fileObjectURL) in javascript. I am creating the blob from base64 encoded data and do create an objectURL like this: const fileObjectURL = URL.createObjectURL(fileBlob); It works fine in latest Firefox browser. But in Chrome I can see that the new tab gets opened but then closed immediately. So I don't get any error in the console etc. The only way it works in Chrome now is to give the base64 data directly to the window.open(fileBase64Data) function. But I don't like the complete data being

图片下载 图片源需要允许跨域 getUrlBase64 = (url,name)=> { var img = url; var image = new Image(); var _t = this; image.crossOrigin = '*'//设置img.crossOrigin image.src = img; image.onload = function () { var base64 = _t.getBase64Image(image); const a = document.createElement('a')//创建a标签下载 a.download = name a.style.display = 'none' a.href = base64 document.body.appendChild(a) a.click() a.remove() window.URL.revokeObjectURL(base64) } } getBase64Image=(img)=> { var canvas = document.createElement("canvas"); canvas.width = img.width; canvas.height = img.height; var ctx = canvas.getContext("2d"); ctx.drawImage

I want to record audio from the microphone with HTML5, then send it to the server to be saved. Currently however, the saved file just contains [object Object] Here are some snippets of my code. Frontend: console.log(blob); $http.post('/api/save_recording', blob) .success(function(new_recording) { console.log("success"); }) The log prints: Blob {type: "audio/wav", size: 237612, slice: function} success Backend: exports.saveRecording = function(req, res) { console.log(req.body); fs.writeFile("temp/test.wav", req.body, function(err) { if(err) { console.log("err", err); } else { return res.json({

I'm studying websocket and have done chat program with websocket/json. But I'm stuck at file uploading ATM. Any advice & answer would be thankful. Server side: package websocket; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.nio.ByteBuffer; import javax.websocket.CloseReason; import javax.websocket.EndpointConfig; import javax.websocket.OnClose; import javax.websocket.OnError; import javax.websocket.OnMessage; import javax.websocket.OnOpen; import javax.websocket.Session; import javax.websocket.server

I have a question about the blob data type in MySQL. I read that the data type can be used to store files. I also read that an alternative is to store the file on disk and include a pointer to its location in the database (via a varchar column). But I'm a little confused because I've read that blob fields are not stored in-row and require a separate look-up to retrieve its contents. So is that any different than storing a pointer to a file on the file system? Bruno Vieira I read that the data type can be used to store files. According to MySQL manual page on Blob, A BLOB is a binary large

What is the fastest way to export files (blobs) stored in a SQL Server table into a file on the hard drive? I have over 2.5 TB of files (90 kb avg) stored as varbinary and I need to extract each one to a local hard drive as quickly as possible. BCP seems to work but it will take over 45 days with the speed I'm seeing, and I'm worried that my script will fail at some point because Management Studio will run out of memory. I tried using a CLR function and it was more than twice as fast as BCP. Here's my code. Original Method : SET @bcpCommand = 'bcp "SELECT blobcolumn FROM blobtable WHERE ID = '

I have a sqlite3 database. One column has the TEXT type, and contains blobs which I would like to save as file. Those are gzipped files. The output of the command sqlite3 db.sqlite3 ".dump" is: INSERT INTO "data" VALUES(1,'objects','object0.gz',X'1F8B080000000000000 [.. a few thousands of hexadecimal characters ..] F3F5EF') How may I extract the binary data from the sqlite file to a file using the command line ? sqlite3 cannot output binary data directly, so you have to convert the data to a hexdump, use cut to extract the hex digits from the blob literal, and use xxd (part of the vim package)