Download link to file saved in BLOB type in database

Question

Hi all,
I have made a page where i am letting users upload a file in any format, and i'm saving it to database in BLOB datatype field of a table.
The filetype is also saved in a different column of the table.
Now I want to retrieve the contents back in that particular format by converting the data in BLOB type to filetype.
And a link should be provided to download the file.
A little help can be taken from this link which uses EJB session to do the same thing.
[http://jdev1013.blogspot.com.au/2009/08/file-upload-and-download-in-toplink-adf.html]
I want to do the same in ADF 11g JDeveloper using Oracle XE database connection.
Below is the code i used to upload file data - now i want to download file data -
public String uploadFile() {
String amDef = "cabinet.model.AppModule";
String config = "AppModuleLocal";
ApplicationModule am = Configuration.createRootApplicationModule(amDef, config);
ViewObject vo1 = am.findViewObject("XfileView1");
Row row = vo1.createRow();
if (uploadedFile.getFilename() != null){       
byte[] array=new byte[(int)uploadedFile.getLength()];
row.setAttribute("FileName", uploadedFile.getFilename());
row.setAttribute("FileContent",createBlobDomain(uploadedFile));
row.setAttribute("FileType", uploadedFile.getContentType());
row.setAttribute("FileSize", uploadedFile.getLength());
vo1.insertRow(row);
am.getTransaction().commit();
DCBindingContainer bindings =
(DCBindingContainer)BindingContext.getCurrent().getCurrentBindingsEntry();
DCIteratorBinding dcItteratorBindings =
bindings.findIteratorBinding("XfileView1Iterator");
dcItteratorBindings.refresh(1);
Configuration.releaseRootApplicationModule(am, true);
return "added";
private BlobDomain createBlobDomain(UploadedFile file)
// init the internal variables
InputStream in = null;
BlobDomain blobDomain = null;
OutputStream out = null;
try
// Get the input stream representing the data from the client
in = file.getInputStream();
// create the BlobDomain datatype to store the data in the db
blobDomain = new BlobDomain();
// get the outputStream for hte BlobDomain
out = blobDomain.getBinaryOutputStream();
IOUtils.copy(in, out);
catch (IOException e)
e.printStackTrace();
catch (SQLException e)
e.fillInStackTrace();
// return the filled BlobDomain
return blobDomain;
Thanks
Cheena Malhotra

Answer 1

Check my 3 part blog about this. This should cover your needs. http://wp.me/pcBZk-aU
Timo