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  Oracle Database Tips by Donald Burleson

Loading and Displaying Images in APEX

Loading images is very easy in APEX.  What you do with them after they are loaded is another thing.  When an application page is built to upload an image, it will be stored in the WWV_FLOW_FILES view.  It is really stored in the wwv_flow_file_objects$ table, but for explanation purposes it will be called wwv_flow_files since this is how it would be referred in queries.

Even though the uploaded image is initially stored in WWV_FLOW_FILES, it is not desirable to keep it there.  This is because sometimes it is better to store it in a table in the parsing schema.  That way it is easier to write PL/SQL to access it and makes it easier to export and import the entire schema, including the images, when deploying the application.

Once the image is stored in the developer's own table, which will be called EASY_IMAGE, then a stored procedure can be created to display the image in an APEX Report.

The following tutorial will:

        Create the EASY_IMAGE table.

        Create an application page to load the image.

        Create a process to move the image to the EASY_IMAGE table.

        Create a stored procedure to pull the image from the EASY_IMAGE table and using some API procedures, display it in an APEX Report.

        Create an application page with a report region to display the image.

Create the EASY_IMAGE Table

In a SQL Command window, run the statements below.  The file named create_easy_image_table.sql in the online code depot can be used.  Another option is to load the file into the SQL Script repository and run it that way.

create table easy_image (
       image_id             number not null,
       name                 varchar2(90) not null,
       filename             varchar2(400),
       mime_type            varchar2(48),
       doc_size             number,
       created_by           varchar2(255),
       created_on           date,
       content_type         varchar2(128),
       blob_content         blob null
)

create unique index ak1_easy_image on easy_image(
image_id )

create unique index ak2_easy_image on easy_image( name
)
/


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

http://www.rampant-books.com/book_2005_2_html_db.htm

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