EXTRACTING XML AND DATE FORMAT

Question

Hello,
I want to extract data from XML using the following syntax.
But I don't get why I get ORA-01830 exception while extracting DATE in YYYY-MM-DD HH24:MI:SS format.
Can you help me ?
alter session set nls_date_format = 'YYYY-MM-DD HH24:MI:SS';
select e.*
from (select xmltype('<root><my_date>2012-04-05</my_date></root>') as dt from dual) t,
xmltable('root'
passing t.dt
columns
my_date date path'my_date'
) e;
select e.*
from (select xmltype('<root><my_date>2012-04-05 14:35:20</my_date></root>') as dt from dual) t,
xmltable('root'
passing t.dt
columns
my_date date path'my_date'
) e;
SQL> alter session set nls_date_format = 'YYYY-MM-DD HH24:MI:SS';
Session modifiÚe.
SQL>
SQL>
SQL> select e.*
2 from (select xmltype('<root><my_date>2012-04-05</my_date></root>') as dt fr
om dual) t,
3 xmltable('root'
4 passing t.dt
5 columns
6 my_date date path'my_date'
7 ) e;
MY_DATE
2012-04-05 00:00:00
SQL>
SQL> select e.*
2 from (select xmltype('<root><my_date>2012-04-05 14:35:20</my_date></root>')
as dt from dual) t,
3 xmltable('root'
4 passing t.dt
5 columns
6 my_date date path'my_date'
7 ) e;
select e.*
ERREUR Ó la ligne 1 :
ORA-01830: Le modÞle du format de date se termine avant la conversion de la
cha¯ne d'entrÚe entiÞre

Answer 1

From 10g and onwards, Oracle doesn't rely on NLS date settings to handle dates in XML.
The supported formats are those of the ISO 8601 : http://www.w3.org/TR/xmlschema-2/#isoformats
SQL> select e.*
  2  from xmltable(
  3        '/root'
  4        passing xmltype('<root><my_date>2012-04-05T14:35:20</my_date></root>')
  5        columns
  6          my_date timestamp path 'my_date'
  7       ) e ;
MY_DATE
05/04/12 14:35:20,000000
SQL>
SQL> select e.*
  2  from xmltable(
  3        '/root'
  4        passing xmltype('<root><my_date>2012-04-05</my_date></root>')
  5        columns
  6          my_date date path 'my_date'
  7       ) e ;
MY_DATE
05/04/2012
If your date string doesn't conform to the supported formats, use a VARCHAR2 datatype and an explicit TO_DATE in the SELECT :
SQL> select to_date(e.my_date, 'YYYY-MM-DD HH24:MI:SS') as my_date
  2  from xmltable(
  3        '/root'
  4        passing xmltype('<root><my_date>2012-04-05 14:35:20</my_date></root>')
  5        columns
  6          my_date varchar2(30) path 'my_date'
  7       ) e ;
MY_DATE
05/04/2012