Oracle raises ORA-01722: invalid number during merge into with nested xmltable - oracle

Question

I'm runnning the code that should parse xml and add it to my table. XML code is loaded from variable "s". Sample of my xml is:
<?xml version="1.0" encoding="utf-8"?><response>
<item>
<id>7294478</id>
<type>ad</type>
<stats list="true">
<period>
<day>2012-12-26</day>
<spent>132.00</spent>
<impressions>93315</impressions>
<clicks>4</clicks>
<reach>38039</reach>
</period>
<period>
<day>2012-12-27</day>
<impressions>7237</impressions>
<reach>4332</reach>
</period>
<period>
<day>2012-12-28</day>
<impressions>571</impressions>
<reach>452</reach>
</period>
</stats>
</item>
</response>
That's the part of code i'm trying to run:
MERGE INTO VK_AD_STATS r
USING (SELECT hmn.STATS_ID,
hmn.STATS_type,
items.STATS_day,
items.STATS_spent,
items.STATS_impressions,
items.STATS_clicks,
items.STATS_reach,
items.STATS_video_views,
items.STATS_video_views_half,
items.STATS_video_views_full,
items.STATS_video_clicks_site,
items.STATS_join_rate
FROM XMLTABLE('response/item' passing (SELECT xmltype(s) resp FROM dual)
COLUMNS STATS_ID NUMBER path '/item/id',
STATS_type VARCHAR2(2000) path '/item/type',
STATS_XML xmltype path '/item/stats/period'
)hmn ,
XMLTABLE('period' passing hmn.STATS_XML
COLUMNS STATS_day VARCHAR2(2000) path '/period/day',
STATS_spent NUMBER path '/period/spent',
STATS_impressions NUMBER path '/period/impressions',
STATS_clicks NUMBER path '/period/clicks',
STATS_reach NUMBER path '/period/reach',
STATS_video_views NUMBER path '/period/video_views',
STATS_video_views_half NUMBER path '/period/video_views_half',
STATS_video_views_full NUMBER path '/period/video_views_full',
STATS_video_clicks_site NUMBER path '/period/_video_clicks_site ',
STATS_join_rate NUMBER path '/period/join_rate'
) items) proc
ON (r.STATS_ID = proc.STATS_ID and r.STATS_day = proc.STATS_day)
WHEN MATCHED THEN UPDATE SET r.STATS_type = proc.STATS_type,
r.STATS_spent = proc.STATS_spent,
r.STATS_impressions = proc.STATS_impressions,
r.STATS_clicks = proc.STATS_clicks,
r.STATS_reach = proc.STATS_reach,
r.STATS_video_views = proc.STATS_video_views,
r.STATS_video_views_half = proc.STATS_video_views_half,
r.STATS_video_views_full = proc.STATS_video_views_full,
r.STATS_video_clicks_site = proc.STATS_video_clicks_site,
r.STATS_join_rate = proc.STATS_join_rate
WHEN NOT MATCHED THEN INSERT (r.STATS_ID,
r.STATS_type,
r.STATS_day,
r.STATS_spent,
r.STATS_impressions,
r.STATS_clicks,
r.STATS_reach,
r.STATS_video_views,
r.STATS_video_views_half,
r.STATS_video_views_full,
r.STATS_video_clicks_site,
r.STATS_join_rate
)
VALUES (proc.STATS_ID,
proc.STATS_type,
proc.STATS_day,
proc.STATS_spent,
proc.STATS_impressions,
proc.STATS_clicks,
proc.STATS_reach,
proc.STATS_video_views,
proc.STATS_video_views_half,
proc.STATS_video_views_full,
proc.STATS_video_clicks_site,
proc.STATS_join_rate
);
COMMIT;
But it raises ORA-01722: invalid number

Answer 1

Extract the spent column as text and then convert it specifying the NLS_NUMERIC_CHARCTERS to use as decimal separator:
SELECT hmn.STATS_ID,
hmn.STATS_type,
items.STATS_day,
TO_NUMBER(
items.STATS_spent,
'99999999999999999999D99',
'NLS_NUMERIC_CHARACTERS='',.'''
) AS stats_spent,
items.STATS_impressions,
items.STATS_clicks,
items.STATS_reach,
items.STATS_video_views,
items.STATS_video_views_half,
items.STATS_video_views_full,
items.STATS_video_clicks_site,
items.STATS_join_rate
FROM XMLTABLE(
'/response/item'
PASSING XMLTYPE(s)
COLUMNS STATS_ID NUMBER path '/item/id',
STATS_type VARCHAR2(2000) path '/item/type',
STATS_XML xmltype path '/item/stats/period'
) hmn,
XMLTABLE(
'/period'
PASSING hmn.STATS_XML
COLUMNS STATS_day VARCHAR2(2000) path '/period/day',
STATS_spent VARCHAR2(23) path '/period/spent',
STATS_impressions NUMBER path '/period/impressions',
STATS_clicks NUMBER path '/period/clicks',
STATS_reach NUMBER path '/period/reach',
STATS_video_views NUMBER path '/period/video_views',
STATS_video_views_half NUMBER path '/period/video_views_half',
STATS_video_views_full NUMBER path '/period/video_views_full',
STATS_video_clicks_site NUMBER path '/period/_video_clicks_site',
STATS_join_rate NUMBER path '/period/join_rate'
) items

Answer 2

Your problem isn't XML related at all - this:
<spent>132.00</spent>
doesn't parse as a number if your NLS settings use , as a decimal separator.
Change your NLS settings to use . as decimal separator, e.g. by running this PL/SQL block:
begin
DBMS_SESSION.SET_NLS ('NLS_LANGUAGE' ,'AMERICAN');
DBMS_SESSION.SET_NLS ('NLS_TERRITORY','AMERICA');
end;
and your code should work.