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  Oracle Database Tips by Donald Burleson

Storing Files in APEX

Uploading files is very easy in Oracle Application Express (APEX)  if the plan is to store them in the provided table WWV_FLOW_FILES.  It may not seem so at first, but after just a few samples you will know exactly how to do it.  The goal of this section is to provide a couple examples of the more common uses for uploading files. Those uses are to store images for later display in a web page and storing documents either for downloading or for display into a browser such as a PDF file.  These two examples will yield the tools necessary to provide the same functionality in a very short time.

Explaining WWV_FLOW_FILES

Loading scripts and other files into the repository have been mentioned throughout this book.  The files uploaded are put into a table in the FLOWS_FILES schema named wwv_flow_file_objects$.  This table name is indicated in the dads.conf file with the parameter PlsqlDocumentTablename.  How it looks in the dads.conf file is shown here:

PlsqlDocumentTablename   wwv_flow_file_objects$

APEX then provides a view to this table named WWV_FLOW_FILES.  Running the following script in a SQL Command window will reveal the files currently loaded into the repository.

select
   id, flow_id, name,
   filename, title, mime_type,
   doc_size, dad_charset, created_by,
   created_on, updated_by, updated_on,
   last_updated, content_type, language,
   description, file_type, file_charset
from
   wwv_flow_files;

The only column missing from the WWV_FLOW_FILES view in the query above is the BLOB_CONTENT column.  This is because the SQL Command window will give an inconsistent data type error when querying a column of BLOB data type.


   
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