Blob stored?

Hi,
When I insert a blob into Oracle database, I read/write the blob in chunk by chunk. I'd like to know how these chunks are stored in the database. We hold a big space and put all chunks together, OR each chunk stored at different space and they are linked together???
Please give an explanation how a blob is stored.
Thank you,
Minh

I would try to use the database, there you have the full control over your data.
There were some examples on asktom.oracle.com where you could see how to bring the blob back into the file system (with a Java Stored Procedure)

Similar Messages

Alternative method for displaying images blobs stored in DB

I am trying to use an Application Process as a means to displaying images stored in BLOB columns in my table. And it works except for one problem. The code for my on-demand Application Process is below (the name of the application process is OUTPUT_IMAGE):
DECLARE
l_mime VARCHAR2(255);
l_length NUMBER;
l_file_name VARCHAR2(2000);
lob_loc BLOB;
BEGIN
SELECT photo_mime_type,
photo_blob,
photo_filename,
dbms_lob.getlength(photo_blob)
INTO l_mime,
lob_loc,
l_file_name,
l_length
FROM persons
WHERE id = 260;
owa_util.mime_header(nvl(l_mime,'application/octet'), FALSE);
htp.p('Content-length: ' || l_length);
htp.p('Content-Disposition: filename="' || l_file_name || '"');
owa_util.http_header_close;
wpg_docload.download_file(lob_loc);
END;
I can then create HTML like:
<img src="f?p=[my_app_id]:0:[the_session_id]:APPLICATION_PROCESS=OUTPUT_IMAGE">
Which works nicely.
The question/problem is: How can I pass the ID of the record (whose BLOB I want to display) to the Application Process? (In the code above you'll see the value of 260 is currently hard coded). I thought about tacking on something like "&my_id=xxx' to the end of the URL but doing so prevents the Application Process from even running. 
All comments/suggestions much appreciated, 
Thanks,
 
Andy

Andrew,
The URL for an Application Process uses the standard f?p syntax.
Try passing your value like this:
< img src="f?p=[my_app_id]:0:[the_session_id]:APPLICATION_PROCESS=OUTPUT_IMAGE:NO::MY_ID:[the value to send]"> You would need to have an item called MY_ID.
Your query could then refer to it as
WHERE id = :MY_ID;
Doug

BLOBs stored in DB

I have some files stored in the DB (11g) as Blobs...mostly images but some PDFs. The files are uploaded using an upload webpage, into a table like:
CREATE TABLE wpg_document (
NAME               VARCHAR(256)   UNIQUE NOT NULL,
MIME_TYPE          VARCHAR(128),
DOC_SIZE           NUMBER,
DAD_CHARSET        VARCHAR(128),
LAST_UPDATED       DATE,
CONTENT_TYPE       VARCHAR(128),
CONTENT            LONG RAW,
BLOB_CONTENT       BLOB
Using this Understanding mod_plsql as a reference to set this up.
I use the PL/SQL Developer tool, and can "see" the BLOBs in this table (blob_content column), and they look fine.
Now I am trying to provide the user a page to view or download the files. I think I'm running into charset issues, but not sure...all the above get stored as "ascii" in the DAD_CHARSET column (not sure why) ...our DB is UTF-8. (NLS_CHARACTERSET is AL32UTF8)
On my "download" page, the PDFs come across as corrupt, and the images render all garbled (actually, the first 1/3 (the first 4086 bytes?) of the image shows fine, then it's all garbled). Here's the code snippet I'm using to fetch the BLOBs, which is the similar to a lot of what's out there on the web:
lv_blob                      BLOB;
v_amt NUMBER DEFAULT 4096;
v_off NUMBER DEFAULT 1;
v_raw RAW(4096);
..SELECT BLOB_CONTENT INTO lv_blob FROM wpg_document WHERE...
BEGIN
       LOOP
         --dbms_output.put_line('Offset = '||v_off);
         -- Read the BLOB
         dbms_lob.READ(lv_blob, v_amt, v_off, v_raw);
         -- Display image
         htp.prn(utl_raw.cast_to_varchar2(v_raw));
         v_off := v_off + v_amt;
         v_amt := 4096;
       END LOOP;
       dbms_lob.CLOSE(lv_blob);
     EXCEPTION
       WHEN NO_DATA_FOUND THEN
         NULL;
     END;
When I run this procedure straight from a PL/SQL Developer "test" window, I get an error (but no error when I browse to the download webpage)
ORA-06502: PL/SQL: numeric or value error: character string buffer too small
it points to this line:
htp.prn(utl_raw.cast_to_varchar2(v_raw));
I'm not sure what's going on here...any ideas?
tia

Ihave narrowed this down a bit. When I change the offset (v_off) to other values (e.g., 1000, 2000, 32767) more or less of the images get garbled. So if I set to 2000, then the first 2000 bytes of the image seems OK, but everything after that is garbled (corrupt). Not sure why.
Not sure this is a solution, nor why it works, but if I replace everything above between BEGIN and END with:
wpg_docload.download_file(lv_blob);
all works fine....dunno.

What is the file format for blobs stored for mds

Does anyone know what type of file is stored into the blobs for a saved search/layout for mds in the streamed docs table? It doesn't appear to be xml, and looking at the a text version of whats in there it looks like its java code, but it isn't quite that.
If anyone can point me in the right direction of being able to to turn the blob back into something human readable that would be great, as i would much rather be able to edit the blob than wipe out data.

The data storage format for MDS data, while you may be able to figure it out or guess what it is by looking at it, is not published as far as I know. The only APIs that are published (again, as far as I know) are [url http://docs.oracle.com/cd/E23943_01/apirefs.1111/e14776/toc.htm]here
Editing the data is at your own risk. You could always try raising a request with https://support.oracle.com asking for details, but I wouldn't bet anything of value on receiving the data you're asking for.

How to Display IMAGE BLOB stored in a table in a html region APEX

Need to know how to display an image stored in a table in a HTML APEX Region.
Please

Hi
Please explain what you mean by it doesn't work?
Are there errors messages, at what point, how far did you get and exactly what did you do????
Please provide more information.
Thanks
Ben

Report 6i and Blob

Currently, I have a word document (BLOB) stored in a table.
The goal is to fetch the BLOB and display the content of the word doc in the report.
I've tried to add a report field which maps to the db column as Binary LOB with File Format property = 'text'. (I've also tried File Format property = OLE and few others. none of them works)
All I am getting is bunch of scrambled character.
What am I missing here?
Thanks!

I looked around Metalink and found...
Unable to Display Complete MS-Word Document from Oracle Reports [ID 233445.1].
It mentioned one work around is to transform the ms-doc to a text file.
However, I am more interesting in what you mentioned earlier... "Split the original in several one page doc."
Is there a programming way to achieve the goal for splitting the original doc in several pages while save into DB via Oracle Form? or do we just have to split the doc manually?
Thanks.

Opening a pdf from a blob

Hi Guys,
I know this is a borderline ApEx problem but I have a page whose sole job is to open a pdf from a blob stored in the database.
This code works for most client machines:
DECLARE
l_blob blob;
BEGIN
SELECT letter INTO l_blob
FROM letters
WHERE lett_id = :P44_LETT_ID;
-- owa_util.mime_header('application/pdf',false);
-- tried pdf and octet they work the same?????
owa_util.mime_header('application/octet',false);
htp.p('Content-Length: ' || dbms_lob.getlength(l_blob));
owa_util.http_header_close;
wpg_docload.download_file(l_blob);
END;
On some machines I get 'Windows cannot open this file ...File: f[7] ...To open this file..........
On most machines this works fine.
I haven't got it to fail with Firefox yet, just IE but only a few machines running IE. Client getting annoyed and I starting to stress.
Many thanks
Gary

Have you already tried adding
htp.p('Content-Disposition: attachment; filename...as described here?
http://download.oracle.com/docs/cd/B32472_01/doc/appdev.300/b32469/up_dn_files.htm#CIHDDJGF
Maybe it solves the problem, in case IE is a little bit picky. But I really don't know.
Patrick
My APEX Blog: http://inside-apex.blogspot.com
The ApexLib Framework: http://apexlib.sourceforge.net
The APEX Builder Plugin: http://sourceforge.net/projects/apexplugin/

View BLOBs in dw CS3 ?

does Dreamweaver CS3 support binary images (also known as
BLOBs) stored in a database?
older versions didn't.
or do i need to store images externally in my website and
reference them with an image path stored in a text field?
even if i could view BLOBs i suspect that internal storage
could slow down the process of dispaying on a web page.
using php/mysql.

I think you just answered your own question.
Am I wrong?
"johnDough407" <[email protected]> wrote in
message
news:f5plvg$587$[email protected]..
> does Dreamweaver CS3 support binary images (also known
as BLOBs) stored in
a
> database?
>
> older versions didn't.
>
> or do i need to store images externally in my website
and reference them
with
> an image path stored in a text field?
>
> even if i could view BLOBs i suspect that internal
storage could slow
down the
> process of dispaying on a web page.
>
> using php/mysql.
>

Downloading a PDF document via blob won't open start acrobat on click

I'm experiencing a problem trying to get acrobat reader to open immediately when viewing a file stored as a blob is clicked. I am updating an old plsql webtoolkit app that stores pdf files in the database as a blob and displays them to the user in a frame. Download is achieved using wpg_docload.download_file() and the example provided by Oracle documentation. The download package body is:
BEGIN
l_filename := SUBSTR(OWA_UTIL.get_cgi_env('PATH_INFO'), 2);
-- get mime type from db
SELECT blob_content,
         mime_type
INTO   l_blob_content,
         l_mime_type
FROM   documents
WHERE name = l_filename;
-- Add header
HTP.init;
OWA_UTIL.mime_header(l_mime_type, false);
HTP.print('Content-Length: ' || DBMS_LOB.getlength(l_blob_content));
HTP.print('Content-disposition: inline; filename="'|| l_filename ||'"');
OWA_UTIL.http_header_close;
-- get document
WPG_DOCLOAD.download_file(l_blob_content);
EXCEPTION
WHEN OTHERS THEN
    HTP.htmlopen;
    HTP.headopen;
    HTP.title('File Downloaded');
    HTP.headclose;
    HTP.bodyopen;
    HTP.header(1, 'Download Status');
    HTP.print('Download of ' || l_filename || ' failed.');
    HTP.print(SQLERRM);
    HTP.bodyclose;
    HTP.htmlclose;
END download;All files will download okay but the acrobat container doesn't open right away and show a progress bar. It waits for the entire file to download, then opens the file. This becomes a bigger issue when the file size increases because it appears as though the site hangs until the document appears.
If I place a file on a site directory instead of inside the database, create a link to it and click it, acrobat opens right away and displays progress. I want to get the site to open blob stored files in adobe right away and show download progress as if the file was stored on a site folder.
Any ideas? Thanks

Add this line to the content header
HTP.print('Accept-Ranges: bytes');

Referencing report columns in the BLOB download link format mask

Hi there,
In a basic report (Apex 4) I have a link to download a BLOB stored in the table. However to save space, instead of using 2 columns, one for the file name and one for the download link, I want to use only one column where the file name is the download link itself.
To do this, I tried using this download link format mask (ATTACH_FILENAME is the report column that contains the file name):
DOWNLOAD:ATTACHMENTS:ATTACH_BLOB:ATTACHMENT_ID::ATTACH_MIME_TYPE:ATTACH_FILENAME:::attachment:#ATTACH_FILENAME#
However it shows #ATTACH_FILENAME# in all rows instead of the actual file name!
I know that using substitution strings (&) works, so is there a way to also reference report columns in this format mask?
Thanks
Luis

Luis, did you finally resolve this? I have the same question.

Please help, I need to read blob and output in bytes from wwv_flow_files.

Hi all,
I am having a requirement to read a blob stored in the oracle table and convert it into bytes. I am loading this table (wwv_flow_files) with APEX.
The code under page 1 is as follows:
DECLARE
z number;
y varchar2(4000);
x varchar2(400);
b blob;
BEGIN
select filename,blob_content into x ,b from APEX_APPLICATION_files where name =:P1_FILE_NAME;
select length(convertBlobToBytes(b)) into z from dual;
:P1_RESULT := z;
end;
Java code is as follows:
import java.io.*;
import java.sql.Blob;
public class convertBlob {
* @param blob
* @return
public static byte[] convertBlobToBytes(Blob blob) {
if (blob==null) return null;
try {
InputStream in = blob.getBinaryStream();
int len = (int) blob.length(); //read as long
long pos = 1; //indexing starts from 1
byte[] bytes = blob.getBytes(pos, len);
in.close();
return bytes;
catch (Exception e) {
System.out.println(e.getMessage());
return null;
PL/SQL wrapper is as follows:
CREATE OR REPLACE FUNCTION convertBlobToBytes(p1 IN BLOB) RETURN LONG RAW AUTHID CURRENT_USER AS LANGUAGE JAVA NAME 'convertBlob.convertBlobToBytes(java.sql.Blob) return byte[]';
I loaded this java class and pl/sql wrapper into the database using JDEVELOPER.
But I am getting the length of the file, as twice the size.
For example, When I run the program which reads the file returns the length of the file as a byte array, the length is 819.
When I pass the same file as a blob from apex, to the java program that converts blob to bytes, the length of the file is 1638.
And hence I am getting wrong results, further in the process.
Can you please help me? Any help is appreciated.
rgds,
Suma.

The example on this page is showing how to read a blob in portions you determine yourself:
http://apex.oracle.com/pls/otn/f?p=31517:91
Denes Kubicek
http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/training
http://apex.oracle.com/pls/otn/f?p=31517:1
-------------------------------------------------------------------

How to read a BLOB (base64 - stream) from XML-file in ORACLE10

ORACLE 10g
PL/SQL function
MY XML-file:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<slo xmlns="http://www.example.org/detection">
 <LekKey>1999_036371_509627</LekKey>
 <HuiNum>46</HuiNum>
 <Res></Res>
 <InfLig>TEST STRUI AFGESTORVEN - PLAANSTRAAT 46</InfLig>
 <XWGS>3.637028</XWGS>
 <YWGS>50.962667</YWGS>
 <Pei>EANDIS</Pei>
 <DatPei>1999-11-30T10:17:36.000+01:00</DatPei>
 <Kan> </Kan>
 <Doc>UEsDBBQABgAIAAAAIQB5gHbnswEAAHcGAAATAAgCW0NvbnRlbnRfVHlwZXNdLnhtbCCiBAIooAACAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAC0VUtP20AQviP1P1h7rewNPVRVFYcDj2OL1FTluqzH
ycK+tDMB8u8764AVwMSBiIsle/d7zLc74+nJg7PFHSQ0wdfiuJqIArwOjfGLWvydX5Q/RIGkfKNs8FCL
NaA4mX05ms7XEbBgtMdaLIniTylRL8EprEIEzyttSE4Rv6aFjErfqgXIb5PJd6mDJ/BUUuYQs+kZtGpl
qTh/4M8bJ9EvRHG62ZelamFcxufvchCRwOILiIrRGq2Ia5N3vnnhq3z0VDGy24NLE/ErG39DIa8897Qt
8DbuJg7XchOhK+Y3559MA8WlSvRLOS5W3ofUyCboleOgqt3KA6WFtjUaenxmiyloQOSDdbbqV5wy/qnk
IR96hRTclbPSELjLFCIeH2ynJ818kMhAH/uQhy4LpLUFPFj6VRIb3l0RbMn/M7Q8b1vQfKvHz8RhmbHV
RmILO64GRHxQ+4g877Vy7ODxkXnUwj1c//k0F1vko0ZaHgJzdW1hj8TfGUZPPWqCeLCB7J6HX/+OZpck
bWxQSwECLQAUAAYACAAAACEAdD85esIAAAAoAQAAHgAAAAAAAAAAAAAAAADqNAkAY3VzdG9tWG1sL19y
ZWxzL2l0ZW0xLnhtbC5yZWxzUEsBAi0AFAAGAAgAAAAhANouSfniAAAAVQEAABgAAAAAAAAAAAAAAAAA
8DYJAGN1c3RvbVhtbC9pdGVtUHJvcHMxLnhtbFBLAQItABQABgAIAAAAIQD+hDirOAIAAMwHAAASAAAA
AAAAAAAAAAAAADA4CQB3b3JkL2ZvbnRUYWJsZS54bWxQSwECLQAUAAYACAAAACEAp/3kQ44BAADeAgAA
EQAAAAAAAAAAAAAAAACYOgkAZG9jUHJvcHMvY29yZS54bWxQSwECLQAUAAYACAAAACEAqchcqowAAADa
AAAAEwAAAAAAAAAAAAAAAABdPQkAY3VzdG9tWG1sL2l0ZW0xLnhtbFBLAQItABQABgAIAAAAIQBgX/2I
CwEAALoBAAAUAAAAAAAAAAAAAAAAAEI+CQB3b3JkL3dlYlNldHRpbmdzLnhtbFBLAQItABQABgAIAAAA
IQDQwaCR/gEAAGgEAAAQAAAAAAAAAAAAAAAAAH8/CQBkb2NQcm9wcy9hcHAueG1sUEsFBgAAAAASABIA
pQQAALNCCQAAAA==</Doc>
</slo>
I have to write an PL/SQL function where I can read all the data in the XML-file (see attach).
In this XML there is a BLOB stored (base64 - stream -> that contains always a MSWORD document).
1) how can I extract this BLOB + the other data in the XML and save this data in a ORACLE table?
2) how can I decode this BLOB and save this MSWORD-document to a fileserver?

First extract your data as CLOB (as it's character based)...
SQL> ed
Wrote file afiedt.buf
1 with t as (select xmltype('<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
2 <slo xmlns="http://www.example.org/detection">
3 <LekKey>1999_036371_509627</LekKey>
4 <HuiNum>46</HuiNum>
5 <Res></Res>
6 <InfLig>TEST STRUI AFGESTORVEN - PLAANSTRAAT 46</InfLig>
7 <XWGS>3.637028</XWGS>
8 <YWGS>50.962667</YWGS>
9 <Pei>EANDIS</Pei>
10 <DatPei>1999-11-30T10:17:36.000+01:00</DatPei>
11 <Kan> </Kan>
12 <Doc>UEsDBBQABgAIAAAAIQB5gHbnswEAAHcGAAATAAgCW0NvbnRlbnRfVHlwZXNdLnhtbCCiBAIooAACAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAC0VUtP20AQviP1P1h7rewNPVRVFYcDj2OL1FTluqzHycK+tDMB8u8764AVwMSBiIsle/d7zLc74+nJg7PFHSQ0wdfiuJqIArwOjfGLWvydX5Q/RIGkfKNs8FCLNaA4mX05ms7XEbBgtMdaLIniTylRL8EprEIEzyttSE4Rv6aFjErfqgXIb5PJd6mDJ/BUUuYQs+kZtGplqTh/4M8bJ9EvRHG62ZelamFcxufvchCRwOILiIrRGq2Ia5N3vnnh
q3z0VDGy24NLE/ErG39DIa8897Qt8DbuJg7XchOhK+Y3559MA8WlSvRLOS5W3ofUyCboleOgqt3KA6WFtjUaenxmiyloQOSDdbbqV5wy/qnkIR96hRTclbPSELjLFCIeH2ynJ818kMhAH/uQhy4LpLUFPFj6VRIb3l0RbMn/M7Q8b1vQfKvHz8RhmbHVRmILO64GRHxQ+4g877Vy7ODxkXnUwj1c//k0F1vko0ZaHgJzdW1hj8TfGUZPPWqCeLCB
7J6HX/+OZpckbWxQSwECLQAUAAYACAAAACEAdD85esIAAAAoAQAAHgAAAAAAAAAAAAAAAADqNAkAY3VzdG9tWG1sL19yZWxzL2l0ZW0xLnhtbC5yZWxzUEsBAi0AFAAGAAgAAAAhANouSfniAAAAVQEAABgAAAAAAAAAAAAAAAAA8DYJAGN1c3RvbVhtbC9pdGVtUHJvcHMxLnhtbFBLAQItABQABgAIAAAAIQD+hDirOAIAAMwHAAASAAAAAAAA
AAAAAAAAADA4CQB3b3JkL2ZvbnRUYWJsZS54bWxQSwECLQAUAAYACAAAACEAp/3kQ44BAADeAgAAEQAAAAAAAAAAAAAAAACYOgkAZG9jUHJvcHMvY29yZS54bWxQSwECLQAUAAYACAAAACEAqchcqowAAADaAAAAEwAAAAAAAAAAAAAAAABdPQkAY3VzdG9tWG1sL2l0ZW0xLnhtbFBLAQItABQABgAIAAAAIQBgX/2ICwEAALoBAAAUAAAAAAAA
AAAAAAAAAEI+CQB3b3JkL3dlYlNldHRpbmdzLnhtbFBLAQItABQABgAIAAAAIQDQwaCR/gEAAGgEAAAQAAAAAAAAAAAAAAAAAH8/CQBkb2NQcm9wcy9hcHAueG1sUEsFBgAAAAASABIApQQAALNCCQAAAA==</Doc>
13 </slo>') as xml from dual)
14 --
15 -- end of test data
16 --
17 select x.*
18 from t
19 ,xmltable(xmlnamespaces(default 'http://www.example.org/detection'),
20 '/slo'
21 passing t.xml
22 columns lekkey varchar(30) path './LekKey'
23 ,doc clob path './Doc'
24* ) x
SQL> /
LEKKEY DOC
1999_036371_509627 UEsDBBQABgAIAAAAIQB5gHbnswEAAHcGAAATAAgCW0NvbnRlbnRfVHlwZXNdLnhtbCCiBAIooAACAAAA
 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAC0VUtP20AQviP1P1h7rewNPVRVFYcDj2OL1FTluqzH
 ycK+tDMB8u8764AVwMSBiIsle/d7zLc74+nJg7PFHSQ0wdfiuJqIArwOjfGLWvydX5Q/RIGkfKNs8FCL
 NaA4mX05ms7XEbBgtMdaLIniTylRL8EprEIEzyttSE4Rv6aFjErfqgXIb5PJd6mDJ/BUUuYQs+kZtGpl
 qTh/4M8bJ9EvRHG62ZelamFcxufvchCRwOILiIrRGq2Ia5N3vnnhq3z0VDGy24NLE/ErG39DIa8897Qt
 8DbuJg7XchOhK+Y3559MA8WlSvRLOS5W3ofUyCboleOgqt3KA6WFtjUaenxmiyloQOSDdbbqV5wy/qnk
 IR96hRTclbPSELjLFCIeH2ynJ818kMhAH/uQhy4LpLUFPFj6VRIb3l0RbMn/M7Q8b1vQfKvHz8RhmbHV
 RmILO64GRHxQ+4g877Vy7ODxkXnUwj1c//k0F1vko0ZaHgJzdW1hj8TfGUZPPWqCeLCB7J6HX/+OZpck
 bWxQSwECLQAUAAYACAAAACEAdD85esIAAAAoAQAAHgAAAAAAAAAAAAAAAADqNAkAY3VzdG9tWG1sL19y
 ZWxzL2l0ZW0xLnhtbC5yZWxzUEsBAi0AFAAGAAgAAAAhANouSfniAAAAVQEAABgAAAAAAAAAAAAAAAAA
 8DYJAGN1c3RvbVhtbC9pdGVtUHJvcHMxLnhtbFBLAQItABQABgAIAAAAIQD+hDirOAIAAMwHAAASAAAA
 AAAAAAAAAAAAADA4CQB3b3JkL2ZvbnRUYWJsZS54bWxQSwECLQAUAAYACAAAACEAp/3kQ44BAADeAgAA
 EQAAAAAAAAAAAAAAAACYOgkAZG9jUHJvcHMvY29yZS54bWxQSwECLQAUAAYACAAAACEAqchcqowAAADa
 AAAAEwAAAAAAAAAAAAAAAABdPQkAY3VzdG9tWG1sL2l0ZW0xLnhtbFBLAQItABQABgAIAAAAIQBgX/2I
 CwEAALoBAAAUAAAAAAAAAAAAAAAAAEI+CQB3b3JkL3dlYlNldHRpbmdzLnhtbFBLAQItABQABgAIAAAA
 IQDQwaCR/gEAAGgEAAAQAAAAAAAAAAAAAAAAAH8/CQBkb2NQcm9wcy9hcHAueG1sUEsFBgAAAAASABIA
 pQQAALNCCQAAAA==
SQL>Then, you can convert the CLOB to a BLOB by doing your base64 decoding.

Rendering the content of a blob from discoverer

Hi Gurus,
I've got to render, on the web browser, the contents of a blob stored in a table. I don't know, at design time, the type/mime of the blob's content, It's actually stored aside the blob in another column of the same table.
It could be sufficent, for me, presenting a link and asking the user to click on it.
What's the way I can realize this?
Thanks in advance
Norberto
PS: My skill is mainly on forms/reports... I'm not an ace in Discoverer technology...

Hi,
You have got 2 options here. You can create a data item for each mime type and have a column for each mime type in the report. Each row would have a link in one of the columns. You will have to create a view or custom folder over your blob table with additional columns for each mime type, for example to create an extra column for Excel:
SELECT ...,
CASE WHEN mime_type = 'application/vnd.ms-excel' THEN blob_content END blob_exel
FROM blob_table
Then set the content_type in the properties of the folder to be XLS for blob_excel column. The user would then have to click on the column which had been populated with the link.
The other option is to write your own mod_plsql procedure to download the blob. It is quite simple, you need to call owa_util.mime_header to set the mime type and wpg_docload.download_file to download the blob. You then create a hyperlink to your mod_plsql procedure.
Hope that helps,
Rod West

Plesae help- needing to read a blob from db into bytes[]

Hi all,
I am having a requirement to read a blob stored in the oracle table and convert it into bytes. I am loading this table (wwv_flow_files) with APEX.
The code under page 1 is as follows:
DECLARE
z number;
y varchar2(4000);
x varchar2(400);
b blob;
BEGIN
select filename,blob_content into x ,b from APEX_APPLICATION_files where name =:P1_FILE_NAME;
select length(convertBlobToBytes(b)) into z from dual;
:P1_RESULT := z;
end;
Java code is as follows:
import java.io.*;
import java.sql.Blob;
public class convertBlob {
* @param blob
* @return
public static byte[] convertBlobToBytes(Blob blob) {
     if (blob==null) return null;
     try {
     InputStream in = blob.getBinaryStream();
     int len = (int) blob.length(); //read as long
long pos = 1; //indexing starts from 1
     byte[] bytes = blob.getBytes(pos, len);
in.close();
     return bytes;
catch (Exception e) {
     System.out.println(e.getMessage());
     return null;
PL/SQL wrapper is as follows:
CREATE OR REPLACE FUNCTION convertBlobToBytes(p1 IN BLOB) RETURN LONG RAW AUTHID CURRENT_USER AS LANGUAGE JAVA NAME 'convertBlob.convertBlobToBytes(java.sql.Blob) return byte[]';
I loaded this java class and pl/sql wrapper into the database using JDEVELOPER.
But I am getting the length of the file, as twice the size.
For example, When I run the program which reads the file returns the length of the file as a byte array, the length is 819.
When I pass the same file as a blob from apex, to the java program that converts blob to bytes, the length of the file is 1638.
And hence I am getting wrong results, further in the process.
Can you please help me? Any help is appreciated.
rgds,
Suma.

Hi all,
Can any of you please help me out?
rgds,
Suma.

Embed blob object into HTML region

Hi everyone!
I am interested in embedding a .swf file into an HTML region in ApEx. It's real easy when the source is a file or http server. However, could this be done if the source was a blob stored in the database?
Below is the code that works for me now in the HTML region, but I wonder if I could get the embed code to extract the source file from the database instead of a file server.
<object width="1024" height="768">
<param name="movie" value="http://webfiles.abc.com/level2/some_xcelsius_dashboard.swf">
<embed src="http://webfiles.abc.com/level2/some_xcelsius_dashboard.swf" width="1024" height="768">
</embed>
</object>
Thanks!!!
-Rudy

Hi
Yes, that is easily done. See this doc on how to download a blob from a table:
Link
When you have created your download function, put a reference to it in the src= parameter.
Luis

Blob stored?

Similar Messages

Maybe you are looking for