ERROR when called TO_CHAR function from XMLQuery

Question

when I tried to execute the followingin XMLQuery by calling TO_CHAR() whithin this query I am getting this error"ORA-19237: XP0017 - unable to resolve call to function - fn:TO_CHAR
any help/ideas on the follwing would be much appreciated.
Thanks
Abdul
select XMLQuery('<marketfeed id="f1" action="CREATE" source="marketfeed1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" >
<competitions>
{for $f in ora:view("fixture")
                    for $c in ora:view("competition")
                     for $homes in ora:view("squad")
                      for $aways in ora:view("squad")
                       for $homet in ora:view("team")
                        for $awayt in ora:view("team")
                   where $f/ROW/GID = "g321667"
                      and $f/ROW/COMPETITIONID = $c/ROW/ID
                      and $f/ROW/HOMESQUADID = $homes/ROW/ID
                      and $f/ROW/AWAYSQUADID = $aways/ROW/ID
                      and $homes/ROW/TEAMID = $homet/ROW/ID
                      and $aways/ROW/TEAMID = $awayt/ROW/ID
                   return              
                   <competition id="{$c/ROW/ID/text()}"
shortname="{$c/ROW/NAME/text()}"
name="{$c/ROW/NAME/text()}">
<teamlists>
<teamitam name="{$homet/ROW/NAME/text()}"
id = "{$homes/ROW/TID/text()}" />
<teamitem name="{$awayt/ROW/NAME/text()}"
id = "{$aways/ROW/TID/text()}" />
</teamlists>
<matches>
<match id="{$f/ROW/GID/text()}"
venue="{$f/ROW/VENUE/text()}"
matchdate="{TO_CHAR($f/ROW/STARTDATE/text(), "YY-MM-DD")}"
name="{concat($homet/ROW/NAME/text(), " v ", $awayt/ROW/NAME/text())}"
>
<teams>
<team home="H" id = "{$homes/ROW/TID/text()}" />
<team home="A" id = "{$aways/ROW/TID/text()}" />
</teams>
</match>
</matches>
</competition>
</competitions>
</marketfeed>'
returning content
from dual
Edited by: QAbdul on 26-Oct-2010 06:44

Answer 1

Hi,
QAbdul wrote:
when I tried to execute the followingin XMLQuery by calling TO_CHAR() whithin this query I am getting this error"ORA-19237: XP0017 - unable to resolve call to function - fn:TO_CHARTO_CHAR is a SQL function, XQuery is unaware of it.
XPath 2.0 specifications define a fn:format-date function but Oracle has not included yet in its XQuery implementation.
Easiest way to go is A_Non's solution, but if you need to format at multiple places in the query, you can declare a local XQuery function.
For example, to format to "DD/MM/YYYY" from the canonical xs:date format "YYYY-MM-DD" :
{code}
declare function local:format-date($d as xs:date) as xs:string
let $s := xs:string($d)
return concat(
substring($s, 10, 2), "/",
substring($s, 7, 2), "/",
substring($s, 2, 4)
{code}
and an example of use :
{code}
SQL> CREATE TABLE test_xqdate AS SELECT sysdate dt FROM dual;
Table created
SQL> SELECT *
2 FROM XMLTable(
3 'declare function local:format-date($d as xs:date) as xs:string
4 {
5 let $s := xs:string($d)
6 return concat(
7 substring($s, 10, 2), "/",
8 substring($s, 7, 2), "/",
9 substring($s, 2, 4)
10 )
11 }; (: :)
12 for $i in ora:view("TEST_XQDATE")/ROW/DT
13 return element e {
14 attribute xs_date_format { $i/text() },
15 attribute local_format { local:format-date($i) }
16 }'
17 COLUMNS
18 xs_date_format VARCHAR2(10) PATH '@xs_date_format',
19 local_format VARCHAR2(10) PATH '@local_format'
20 )
21 ;
XS_DATE_FORMAT LOCAL_FORMAT
2010-10-28 28/10/2010
{code}