Download content clob of function instead of a blob column in a table

I found a few examples of how to create a download link data stored in a blob column. However my data are not stored in a blob column, but are created in a function that returns a clob. Of course, this feature can be used to fill a blob column, which can then be downloaded but there may be a more direct route.

Hello René,.

I adapted one of my snippets for the download links for your case. The procedure is much the same as that concerning an existing blob. In order to offer the download, you must convert your clob in a blob, which can be done easily by using the corresponding function provided by the [http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14258/d_lob.htm url] DBMS_LOB-API.
The result might look like the following (untested) code snippet:

CREATE OR REPLACE procedure download_from_function (p_func_argument IN VARCHAR2, p_filename IN VARCHAR2)
AS
  l_http_response  UTL_HTTP.resp;
  l_blob           BLOB;
  l_raw            RAW(32767);
  l_length         INTEGER;
  l_dest_offset    INTEGER := 1;
  l_src_offset     INTEGER := 1;
  l_lang_context   INTGER := DBMS_LOB.DEFAULT_LANG_CTX;
  l_warning        INTEGER;
BEGIN
  -- Initialize the BLOB.
  DBMS_LOB.createtemporary(l_blob, FALSE);
  -- replace the function call for src_clob
  DBMS_LOB.convertToBlob( dest_lob     => l_blob,
                          src_clob     => your_clob_function(p_func_argument),
                          amount       => DBMS_LOB.LOBMAXSIZE,
                          dest_offset  => l_dest_offset,
                          src_offset   => l_src_offset,
                          blob_csid    => DBMS_LOB.DEFAULT_CSID,
                          lang_context => l_lang_context,
                          warning      => l_warning);
  l_length := DBMS_LOB.getlength(l_blob);

  -- create response header
  OWA_UTIL.mime_header('text/plain', false);
  -- add furhter header attributes
  htp.p('Content-length: ' || l_length);
  htp.p('Content-Disposition: attachment; filename="' || p_filename || '"');
  -- close the headers
  OWA_UTIL.http_header_close;
  -- download the BLOB
  WPG_DOCLOAD.download_file( l_blob );
  -- release BLOB from memory
  DBMS_LOB.freetemporary(l_blob);

EXCEPTION
  WHEN OTHERS THEN
    DBMS_LOB.freetemporary(l_blob);
    RAISE;
END download_from_function;
/
-- Page process before header on blank page
BEGIN
  download_from_function (p_func_argument => 'your_argument_for_your_clob_returning_function',
                          p_filename => 'filename_for_download.txt');
END;

You must change the function name and arguments to fit your clob function signature. You can also add a characterset conversion if necessary. See the [url http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14258/d_lob.htm] API - doc for more details.

-Udo

Tags: Database

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