Posted by Store, Preview & download attachment from OS File instead of Database Table
Click to download the details PDF document of this topicLet us take a look the Final view of the Work done:
Step-1: Create and grant permission of Oracle Directory to Schema
Login to the database using SYS as SYSDBA Privilege and execute the below command:
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CREATE DIRECTORY FILE_DIR AS 'D:\ORADEV\FILE_DIR'; |
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GRANT READ,WRITE ON DIRECTORY FILE_DIR TO RESEARCH; |
Step-2: Create Database Table, Sequence & Trigger
Create Table:
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CREATE TABLE "TB_ATTACHMENT" ( "DOC_ID" NUMBER, "DOC_NAME" VARCHAR2(200), "FILE_NAME" VARCHAR2(200), "MIME_TYPE" VARCHAR2(200), "CHAR_SET" VARCHAR2(200), "DOC_BLOB" BLOB, CONSTRAINT "TB_ATTACHMENT_PK" PRIMARY KEY ("DOC_ID") ); |
Create Sequence:
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CREATE SEQUENCE TB_ATTACHMENT_SEQ NOCACHE; |
Create Trigger:
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create or replace TRIGGER TB_ATTACHMENT_BLOB_TO_FILE BEFORE INSERT ON TB_ATTACHMENT for each row DECLARE l_file UTL_FILE.FILE_TYPE; l_file_name varchar2(500); l_buffer RAW(32767); l_amount BINARY_INTEGER := 32767; l_pos INTEGER := 1; l_blob BLOB; l_blob_len INTEGER; BEGIN l_blob := :NEW.DOC_BLOB; l_blob_len := DBMS_LOB.getlength(l_blob); if :NEW.DOC_ID is null then :NEW.DOC_ID := TB_ATTACHMENT_SEQ.NEXTVAL; end if; if l_blob_len > 0 then /* means the attachmennt is not null */ l_file := UTL_FILE.fopen('FILE_DIR',:NEW.FILE_NAME,'wb', 32767); /* read directory */ WHILE l_pos <= l_blob_len LOOP DBMS_LOB.read(l_blob, l_amount, l_pos, l_buffer); UTL_FILE.put_raw(l_file, l_buffer, TRUE); l_pos := l_pos + l_amount; END LOOP; UTL_FILE.fclose(l_file); --:NEW.BLOB_CONTENT := EMPTY_BLOB(); /* after moved file to os directory make empty the BLOB (option-1) */ :NEW.DOC_BLOB := null; /* after moved file to directory make the BLOB empty(option-2) */ end if; EXCEPTION WHEN OTHERS THEN IF UTL_FILE.is_open(l_file) THEN UTL_FILE.fclose(l_file); END IF; RAISE; end TB_ATTACHMENT_BLOB_TO_FILE; |
Step-3: Create Oracle Apex Pages
Create Oracle Apex Page with Oracle Apex wizard.
Page 28 For Interactive Report, Page 29 for Upload document. During creating page using wizard, Assign Table : TB_ATTACHMENT, Primary Key : DOC_ID
Now go the Page 29 (Upload attachment pop-up page) and update the property of column P29_DOC_BLOB as below
- MIME_TYPE Column : MIME_TYPE
- FILE_NAME column : FILE_NAME
- CHARACTER_SET column : CHARACTER_SET
Now go to the Page 28 (interactive report) and Update the Query Source as below:
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select "DOC_ID", "DOC_NAME", "FILE_NAME", "MIME_TYPE", "CHAR_SET", null as PREVIEW_FILE, 'download' as DOWNLOAD_FILE, sys.dbms_lob.getlength("DOC_BLOB") "DOC_BLOB" from "TB_ATTACHMENT" |
Now go the Column property of PREVIEW_FILE and update property info as below:
- Type
: Link
- Link Text : <span class=”fa fa-arrows” title=”Launch File”></span>
- Link Attributes: target =”_blank” Title=”Document Preview”
- Target:
- Type: Page in this Application
- Page : 31
- Set Items:
- P31_ID : #DOC_ID#
- P31_FILE_NAME : #FILE_NAME#
- P31_MIME_TYPE : #MIME_TYPE#
- Clear Cache: 31
Now create a New Apex Blank Page (Page 31) as target page from page 28. Page 31 must be normal full page (not pop-up modal page) which will be used as document previewer.
- Create a Region with Type Static Content and template blank with attribute and add 3 hidden items as show below (Page-31):
- Hidden
Items:
- P31_ID
- P31_FILE_NAME
- P31_MIME_TYPE
Step-4: Create the Apex Process to Preview the file
- Create Page Level Process in the Page 31 as mentioned below:
- Process
Name : Process to preview file
- Type : PL/SQL Code
- Sequence : 1
- Point: Before Header
- PL/SQL Code:
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declare l_bfile BFILE; l_blob blob; BEGIN DBMS_LOB.CREATETEMPORARY(l_blob, TRUE); l_bfile := BFILENAME('FILE_DIR', :P31_FILE_NAME); DBMS_LOB.OPEN(l_bfile, DBMS_LOB.LOB_READONLY); DBMS_LOB.OPEN(l_blob, DBMS_LOB.LOB_READWRITE); DBMS_LOB.LOADFROMFILE ( DEST_LOB => l_blob, SRC_LOB => l_bfile, AMOUNT => DBMS_LOB.GETLENGTH(l_bfile) ); OWA_UTIL.MIME_HEADER(NVL(:P31_MIME_TYPE,'application/octet'),FALSE); owa_util.http_header_close; DBMS_LOB.CLOSE(l_bfile); DBMS_LOB.CLOSE(l_blob); WPG_DOCLOAD.DOWNLOAD_FILE(l_blob); DBMS_LOB.FREETEMPORARY(l_blob); END; |
Preview Document:
- Go to the interactive report runtime (Page 28)
- Click ‘Create’ button to upload new document
- After appearing upload screen, select any attachment file (.doc, image, xls..etc) and upload
- After successfully uploaded the file, you will see column DOC_BLOB is blank in the database table. (trigger processed it)
- Go to the Oracle Directory path and you should see the file is present in the directory (trigger processed it)
- Go back to runtime of Interactive report (Page-28), Click the document preview icon and you will see the document is displaying in a new browser tab
Step-5: Create the Apex Process to Download the file
- Create a new Apex blank full page (Normal Page not Pop-up modal) to download file process. In my example the new blank page is 30
- Create a Region in the page 30
Region Property:
- Name:
Item Region
- Type : Static Content
- Template : Blank with Attribute
- Add
2 Hidden Items in the region Item Region (Page-30)
- P30_FILE_NAME
- P30_MIME_TYPE
- Create
a page process (Page-30)
- Process Name : Process to download Attachment
- Process Type: PL/SQL Code
- Sequence: 1
- Point: Before Header
- PL/SQL Code:
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declare l_bfile BFILE; l_blob BLOB; begin dbms_lob.createtemporary(l_blob,TRUE); l_bfile := BFILENAME('FILE_DIR',:P30_FILE_NAME); dbms_lob.fileopen(l_bfile,DBMS_LOB.file_readonly); dbms_lob.loadfromfile(l_blob,l_bfile,dbms_lob.getlength(l_bfile)); owa_util.mime_header(NVL(:P30_MIME_TYPE,'application/octet'),FALSE); htp.p('Content-Length: '||DBMS_LOB.GETLENGTH(l_blob)); htp.p('Content-Disposition: attachment; filename="'||:P30_FILE_NAME||'"'); owa_util.http_header_close; WPG_DOCLOAD.download_file(l_blob); dbms_lob.fileclose(l_bfile); end; |
- Now go back to the Interactive Report (Page-28) and update the property of column DOWNLOAD_FILE
- Type
: Link
- Link Text: #DOWNLOAD_FILE#
- Link:
- Target :
- Page: 30
- P30_FILE_NAME : #FILE_NAME#
- P30_MIME_TYPE : #MIME_TYPE#
- Clear Cache: 30
- Target :
Download Document:
- After completing the above process go to Interactive Report runtime page (Page-28)
- Run the page
- In the runtime click download link icon
- You will be offered to save document into local file
Thank You for your interest in Oracle Apex
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