Display PDF file in the Apex query report using HTML Expression

Question

Hi Folks,
I have PDFs stored in BLOB columns along with FILE_ID column in the database.
I want to display these to the APEX user on the page at runtime.
I have created a SQL Query report page to display FILE_ID column.
I am using HTML Expression property of the FILE_ID column to pull the image from the table using PROC_DISPLAY_DOCUMENT procedure.
I typed folowing code int the HTML Expression text area of the FILE_ID column of the report page :
<img src="#OWNER#.proc_display_document?p_id=#file_id#"/>
I am using following Procedure code:
create or replace procedure "PROC_DISPLAY_DOCUMENT"(p_id number) as
s_mime_type varchar2(48);
n_length number;
s_filename varchar2(400);
lob_image blob;
Begin
select MIME_TYPE,dbms_lob.getlength(blob_content),file_name,blob_content
into s_mime_type,n_length,s_filename,lob_image
from tbl_upload_file
where file_id = p_id;
owa_util.mime_header(nvl(s_mime_type, 'application/octet' ),false);
--set the size so the browser knows how much it will be downloading
htp.p( 'content-length: '|| n_length );
--The file name will be used by the browser if the users does a "save as" 
htp.p( 'content-Disposition: filename="' || s_filename ||'"');
owa_util.http_header_close;
--Download the BLOB
wpg_docload.download_file( lob_image );
exception
WHEN NO_DATA_FOUND THEN
RAISE_APPLICATION_ERROR(-202121,'Record matching screenfield filename not found, PROC_DISPLAY_DOCUMENT.');      
end;
--This is very Important
--grant execute on PROC_DISPLAY_DOCUMENT to public;
This code does not work and report does not display PDF image.
Any help to troubleshoot this code will be appreciated.
Thank you in advance.
Jaya

Answer 1

Hi Dimitri,
I hope you can see HTML Expression code now. Thank You for responding.
I have PDFs stored in BLOB columns along with FILE_ID column in the database.
I want to display these to the APEX user on the page at runtime.
I have created a SQL Query report page to display FILE_ID column.
I am using HTML Expression property of the FILE_ID column to pull the image from the table using PROC_DISPLAY_DOCUMENT procedure.
I typed folowing code int the HTML Expression text area of the FILE_ID column of the report page :
[!--  img src="#OWNER#.proc_display_document?p_id=#file_id#" ]
I am using following Procedure code:
create or replace procedure "PROC_DISPLAY_DOCUMENT"(p_id number) **
mimetype varchar2(48);
n_length number;
s_filename varchar2(400);
lob_image blob;
Begin
select MIME_TYPE,dbms_lob.getlength(blob_content),file_name,blob_content
into s_mime_type,n_length,s_filename,lob_image
from tbl_upload_file
where file_id = p_id;
owa_util.mime_header(nvl(s_mime_type, 'application/octet' ),false);
--set the size so the browser knows how much it will be downloading
htp.p( 'content-length: '|| n_length );
--The file name will be used by the browser if the users does a "save as"
htp.p( 'content-Disposition: filename="' || s_filename ||'"');
owa_util.http_header_close;
--Download the BLOB
wpg_docload.download_file( lob_image );
exception
WHEN NO_DATA_FOUND THEN
RAISE_APPLICATION_ERROR(-202121,'Record matching screenfield filename not found, PROC_DISPLAY_DOCUMENT.');
end;
--This is very Important
--grant execute on PROC_DISPLAY_DOCUMENT to public;
This code does not work and report does not display PDF image.
Any help to troubleshoot this code will be appreciated.
Thank you in advance.
Jaya