Re: XMLEXISTS on legacy XML with malformed xmlns

2016-02-12 1:53 GMT+01:00 Edson Richter <edsonrichter(at)hotmail(dot)com>:

> Hi!
>
> I've some (about 1M records) containing legacy XML I would like to parse
> and apply XMLEXISTS.
>
> This is the query:
>
> select * from xmllog
> where xpath_exists(('//MyDocument[(at)DocNum = ''000411828'']'::text),
> xmlparse(document cdataout));
>
> This is the error:
>
> ERRO: could not parse XML document
> SQL state: 2200M
> Detail: line 2: xmlns:leg: 'LEGACYAPP - SEND MSG EVENTS ABOUT' is not a
> valid URI
> <leg:sendmsgeventsabout xmlns:leg="LEGACYAPP - SEND MSG EVENTS ABOUT">
> ^
>
> This is the sample XML with malformed xmlns (I've shortenet the data, but
> the important thing here is the malformed xmlns):
>
> "<?xml version="1.0" encoding="utf-8" ?>
> <leg:sendmsgeventsabout xmlns:leg="LEGACYAPP - SEND MSG EVENTS ABOUT">
> <carrier xmlns="" controlnum="04503660000146">
> <MyDocument DocNum="000511852">
> <other_info>0</other_info>
> <complement info (...)"
>
>
> I can easly read this XML in Notepad++, and also in Java - but PostgreSQL
> always throw error.
>
> Can you plase tell me how can make PostgreSQL ignore this malformed xmlns
> and proceed processing the XML?
>

PostgreSQL uses libxml2, but the usage isn't too configurable. So my advice
is using defensive strategy and clean/fix wrong namespace with string tools
- replace function.

Regards

Pavel

>
> Thanks,
>
> --
> Atenciosamente,
>
> Edson Carlos Ericksson Richter
>
>
>
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