How to download Postgres bytea column as file

Question

Currently, i have a number of files stored in postgres 8.4 as bytea. The file types are .doc, .odt, .pdf, .txt and etc.

May i know how to download all the file store

Answer 1

DO $$ 
DECLARE   
   l_lob_id OID;
   r record; BEGIN

  for r in
    select data, filename from bytea_table

   LOOP
    l_lob_id:=lo_from_bytea(0,r.data);
    PERFORM lo_export(l_lob_id,'/home/...'||r.filename);
    PERFORM lo_unlink(l_lob_id);   
    END LOOP;

END; $$