Re: JVM in the database

From: Jeff Chirco <>
Date: Mon, 9 Dec 2019 12:43:40 -0800
Message-ID: <>

Here you go. I found this on the internet years ago so I take no credit no do I understand much about it. But it works great.

create or replace and compile java source named blobhandler as import java.lang.*;

    import java.sql.*;
    import oracle.sql.*;
    public class BlobHandler {
      public static void ExportBlob(String myFile, BLOB myBlob) throws Exception {

        File binaryFile = new File(myFile);
        FileOutputStream outStream = new FileOutputStream(binaryFile);
       InputStream inStream = myBlob.getBinaryStream();
       int size;
       if (myBlob.length()> 20000000) {  // tune this to whatever
appropriate value
         size = 20000000;
       } else {
         size = (int)myBlob.length();
       byte[] buffer = new byte[size];
       int length = -1;
       while ((length = != -1)
         outStream.write(buffer, 0, length);



                                     p_blob   IN BLOB)
       NAME 'BlobHandler.ExportBlob(java.lang.String, oracle.sql.BLOB)';

On Fri, Dec 6, 2019 at 7:21 AM Noveljic Nenad <> wrote:

> Hi Jeff,
> Have you ever processed files larger than 536870895 bytes?
> Could you share the snippet which writes the BLOB into a file? Do you
> possibly stream it to an InputStream object, buffer it, and then stream it
> to the file with the FileOutputStream object?
> If yes, what’s the buffer size? The code to allocate the buffer should
> look similar to this:
> byte[] buffer = new byte[bufferSize];
> Best regards,
> Nenad
> I use a java procedure to dump blob files to an actual file. We store some
> PDF's in the database as blob and at times they need to be dumped to a
> files. Usually its when they want hundreds at time. We found doing this in
> a loop with PL/SQL was really slow and slower over time. I found a Java
> procedure to do this and is is super quick.
> We also have another to get file and directory information. It returned
> back more information that PL/SQL and also was really fast.
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Received on Mon Dec 09 2019 - 21:43:40 CET

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