Parsing large XML file with PL/SQL

Question

I\'m trying to parse quite large XML file. FIle is large enough to make impossible to use VARCHAR2, so I\'ve decided to use CLOB. Code looks fine, but I still get an e

Answer 1

You are reading the file line by line, but overwritting your xmlClob with each line, not appending. You could build up the CLOB by reading into a varchar2 buffer and appending, but you can also use the DBMS_LOB built-in procedures to do it for you:

DECLARE
  xmlClob CLOB;
  xmlFile BFILE;
  x XMLType;

  src_offset number := 1 ;
  dest_offset number := 1 ;
  lang_ctx number := DBMS_LOB.DEFAULT_LANG_CTX;
  warning integer;
BEGIN
  xmlFile := BFILENAME('XMLPARSERADRESYCUZK', 'pokus.xml');
  DBMS_LOB.CREATETEMPORARY(xmlClob, true);
  DBMS_LOB.FILEOPEN(xmlFile, DBMS_LOB.FILE_READONLY);
  DBMS_LOB.LOADCLOBFROMFILE(xmlClob, xmlFile, DBMS_LOB.LOBMAXSIZE, src_offset,
    dest_offset, DBMS_LOB.DEFAULT_CSID, lang_ctx, warning);
  x := XMLType.createXML(xmlClob);
  DBMS_LOB.FILECLOSEALL();
  DBMS_LOB.FREETEMPORARY(xmlClob);
  FOR r IN (
...

When I use that and load your file I get the output:

CUZK Pod smdli.t.m 1800/9

You probably want some error checkign around the DBMS_LOB calls, this is just a simple demo.