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  Oracle Database Tips by Donald Burleson

Using APEX to Create the File Browse… Item

1.       Click the  icon in the Items area.

2.       On the Item Type page, choose the File Browse option and click Next.

3.       On the Display Position page:

·        Item Name: P1090_NAME

·        Sequence: 10

·        Region: Image Upload

·        Click Next.

4.       On the Item Attributes page:

·        Label: Image File Name.

·        Field Width: 80

·        Click Next.

5.       On the next page click on the Create Item button.

Create the Upload Button

Now it is time to provide a button to submit the page.  The file will be uploaded when the page is submitted.

1.       Click the  icon in the Buttons area.

2.       On the Button Region page, click Next.

3.       On the Button Position page, choose the Create a button in a region position option and click Next.

4.       On the Button Attributes page, enter UPLOAD for the Button Name and click Next.

5.       On the Image Attributes page, click Next.

6.       On the Display Properties page, click Next.

7.       On the Branching page enter &APP_PAGE_ID. for the Branch to Page field and click Create Button.  Remember the ending period!

Create the Copy Image Process

This process is going to move the record inserted into the wwv_flow_files view over to the new easy_image table.

1.       Click on the  icon in the Processes area of the Page Processing region.

2.       On the Process Type page, choose the PL/SQL option and click Next.

3.       On the Process Attributes page:

·        Name: Copy Image

·        Sequence: 10

·        Point: On Submit - After Computation and Validations

·        Click Next. 

4.       On the Process page, enter the following for the PL/SQL Page Process and click Next.  The full text can be found in file copy_image_process.sql in the online code depot.

   -- When an image is uploaded it is stored in the
   -- The wwv_flow_file_objects$ table is identified
in the dads.conf
   -- file in the PlsqlDocumentTablename
   -- WWV_FLOW_FILES is a view to this table.
   -- We want to keep the image in our own table.
   -- Copy the image from WWV_FLOW_FILES to our own
   insert into easy_image(
          image_id, name, filename,
          mime_type, doc_size, created_by,
          created_on, content_type, blob_content )
   select id, name, filename,
          mime_type, doc_size, created_by,
          created_on, content_type, blob_content
   from   wwv_flow_files
   where  name = :P1090_NAME;
    -- Now that we have copied the image to our own EASY_IMAGE table
   -- delete it from the WWV_FLOW_FILES table.  That way we can keep
   -- the files from growing too much in the WWV_FLOW_FILES and make
   -- it easier for use to make backups of our data.
   -- Deleting the record is done by referencing the NAME column.
   -- When the file is uploaded the P14_NAME page item will be set to
   -- the value of NAME that was put into the WWV_FLOW_FILES table
   -- and we can use it for reference.
   delete from wwv_flow_files where name =

5.       On the Message page:

·        Success Message: Image successfully loaded.

·        Failure Message: Image could not be loaded.

·        Click Next. 

6.       On the Process Conditions page:

·        When Button Pressed: Select the UPLOAD item.

·        Click Create Process.

The page to upload an image is now complete.  Run the new application page and take a look.  The finished page is shown in Figure 9.1 with the Image File Name filled in.

Uploading an Image

On the newly created application page, click on the Browse… button and navigate to the C:\htmldb_book\CodeDepot\images\niagara_falls.jpg file.  After selecting the file, click the Upload button. 

The following is going to happen when the button is clicked:

·        The application page is submitted and the fact that is being submitted by pressing the Upload button is stored in the HTML request as UPLOAD.

·        The image is automatically inserted into the wwv_flow_files view.

·        When the image is inserted the P1090_NAME page item will be set to a value of F22557/niagara_falls.jpg.  NOTE:  the F22557 will be different on each system.  Since the wwv_flow_files has a unique index in the NAME column, the value in the P1090_NAME page item can be used to select information about the image that was just inserted.

·        The page process Copy Image will be executed to move the image record to the EASY_IMAGE table.  The process is executed on the condition of the UPLOAD button being pressed.  Also, the process uses the P1090_NAME page item in the SQL statements to copy the image.

·        The page will be rendered and the results will be displayed.

The above book excerpt is from:

Easy HTML-DB Oracle Application Express

Create Dynamic Web Pages with OAE

ISBN 0-9761573-1-4   

Michael Cunningham & Kent Crotty

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