RE: XMLTABLE question

Thanks for your quick response.

We’ve managed to resolve this problem.

SELECT xt.id,xt1.RESULT_POS,xt1.product,xt1.name,xt2.item_pos,xt2.item_text, xt2.item_value
FROM XML_TABLE xt,
XMLTABLE('//storedresults/result' PASSING xt.resultxml COLUMNS RESULT_POS FOR ORDINALITY, PRODUCT CHARACTER VARYING(20) path 'product', NAME CHARACTER VARYING(20) path 'name', ITEMS_XML XML PATH 'items') xt1,
XMLTABLE('//items/item' PASSING xt1.ITEMS_XML COLUMNS ITEM_POS FOR ORDINALITY, ITEM_TEXT CHARACTER VARYING(300) PATH 'text', ITEM_VALUE CHARACTER VARYING(300) PATH 'value') xt2
WHERE xt.id = 1;

Seems to be different on the way you need to input the path through to another XMLTABLE than you do in Oracle – this seems to resolve my problem.

Thanks for your time.

David

From: Pavel Stehule [mailto:pavel(dot)stehule(at)gmail(dot)com]
Sent: 04 September 2018 16:06
To: David Day <David(dot)Day(at)cdl(dot)co(dot)uk>
Cc: pgsql-sql(at)lists(dot)postgresql(dot)org; Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Subject: Re: XMLTABLE question

Hi

2018-09-04 12:05 GMT+02:00 David Day <David(dot)Day(at)cdl(dot)co(dot)uk<mailto:David(dot)Day(at)cdl(dot)co(dot)uk>>:
Hi,

I was hoping to get some advice and potentially a solution to my problem.

I have put a test case together as per attachment with the error I am getting when using the XMLTABLE function.

I am trying to migrate my code from Oracle to Postgresql so just wondering how best to do this using this XMLTABLE option for this particular scenario.

It looks so this scenario is supported. This moment I cannot to say, if it is a PostgreSQL bug. Now, PostgreSQL XPath function doesn't requires document format of XML

so <a><b></b><b></b></a> is correct, <b></b><b></b> is not correct. Theoretically it can be controlled by xmloption configuration value, but it is not applied in this case.

I found workaround

CREATE OR REPLACE FUNCTION todoc(xml) RETURNS xml AS $$ select xmlelement(node aux, $1) $$ language sql;

This query is working

SELECT xt.id<http://xt.id>,
xt1.RESULT_POS,
xt1.product,
xt1.name<http://xt1.name>,
xt2.item_pos,
xt2.item_text,
xt2.item_value
FROM XML_TABLE xt,
XMLTABLE('//storedresults/result'
PASSING xt.resultxml
COLUMNS RESULT_POS FOR ORDINALITY,
PRODUCT CHARACTER VARYING(20) path 'product',
NAME CHARACTER VARYING(20) path 'name',
ITEMS_XML XML PATH '//items/item') xt1,
todoc(items_xml),
XMLTABLE('/aux/item'
PASSING todoc
COLUMNS
ITEM_POS FOR ORDINALITY,
ITEM_TEXT CHARACTER VARYING(300) PATH 'text',
ITEM_VALUE CHARACTER VARYING(300) PATH 'value') xt2
WHERE xt.id<http://xt.id> = 1;

Please, try to report this issue as bug

Regards

Pavel Stehule

Kind regards

David Day
Oracle Developer
CDL

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