Variable printing problem Clob into 32 KB chunks using a loop

Hello
I tried to generate and return a XML file that is extended to the APEX with oracle 11g Express Edition 4.1 (more than 900 lines and for each line must sees 34 columns of information), but I do not know what is happening with the loop I use because only when I use a filter for consultation 19 ranks the xml file is generated, but if I need to generate the XML for all the lines (more than 900) the XML is empty and didn't display an error message.

Please I need your help.
Thank you.

Attached to the code source processed:

declare
l_clob_XML CLOB.
xml_size pls_integer: = 32000;
Start
sys. HTP.init;
wwv_flow.g_page_text_generated: = true;
wwv_flow.g_unrecoverable_error: = true;

DBMS_LOB. CREATETEMPORARY (lob_loc = > l_clob_XML, cache = > false, hard = > dbms_lob.session);

Select xmlElement
(
"iva"
xmlElement ("numeroRuc", J.RUC),
xmlElement ("razonSocial", J.RAZON_SOCIAL),
...
xmlElement)
"shopping")
Select xmlAgg)
xmlElement)
"detalleCompra,"
xmlForest)
K.COD_SUSTENTO as "codSustento."
K.TPLD_PROV as "tpldProv."
....
)
)
)
)
SRI_COMPRAS k
...
)
)
). getClobVal()
in l_clob_XML
ANEXO_INFORMANTE j
....
sys.owa_util.mime_header('Text/XML',false);
sys. HTP.p ('Cache-Control: non-cache');
sys. HTP.p ('Pragma: non-cache');
sys.owa_util.http_header_close;

Recorre - intervalos 32 k
for i from 0... CEIL ((DBMS_LOB. GetLength (l_clob_XML) - 1) / xml_size)
loop
sys. HTP. PRN (dbms_lob.substr (l_clob_XML, xml_size, 1 + i * xml_size));
end loop;

DBMS_LOB. FREETEMPORARY (lob_loc = > l_clob_XML);
end;

OK, I have reproduced the issue.

The problem is that DBMS_LOB. SUBSTR does not necessarily return the amount specified as input.
It's a documented behaviour to account for fixed length character sets not.

The solution is to check the length of the extracted substring to calculate the next offset.

Here is an example of code tested successfully with a query on object, in order to obtain a large enough output XML doc:

declare

  v_clob        clob;
  v_buffer      varchar2(32767);
  v_length      number;
  v_amount      number := 32767;
  v_offset      number := 1;

begin

  sys.htp.init;
  wwv_flow.g_page_text_generated := true;
  wwv_flow.g_unrecoverable_error := true;

  dbms_lob.createtemporary(lob_loc => v_clob, cache => false, dur => dbms_lob.session);

  select xmlserialize(document
           xmlelement("rowset",
             xmlagg(
               xmlelement("row",
                 xmlforest(owner, object_name, subobject_name, object_id,
                           data_object_id, object_type, created, last_ddl_time,
                           timestamp, status, temporary, generated,
                           secondary, namespace, edition_name
                           )
               )
             )
           ) as clob
         )
  into v_clob
  from all_objects;

  v_length := dbms_lob.getlength(v_clob);

  sys.owa_util.mime_header('text/xml', false);
  sys.htp.p('Content-Length: ' || v_length);
  sys.owa_util.http_header_close;

  -- read and write in chunk of 32k
  while v_offset <= v_length loop
    dbms_lob.read(v_clob, v_amount, v_offset, v_buffer);
    htp.prn(v_buffer);
    v_offset := v_offset + v_amount;
  end loop;

  dbms_lob.freetemporary(lob_loc => v_clob);

end;

Tags: Database

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Published by: DM on July 7, 2010 14:22

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