| From: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
|---|---|
| To: | Mike Fowler <mike(at)mlfowler(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: review: xml_is_well_formed |
| Date: | 2010-08-09 14:20:39 |
| Message-ID: | 1281363639.22702.1.camel@fsopti579.F-Secure.com |
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| Thread: | |
| Lists: | pgsql-hackers |
On lör, 2010-08-07 at 16:47 +0100, Mike Fowler wrote:
> To be honest I'm happiest with returning a boolean, even if there is
> some confusion over content only being valid. Though changing the
> return
> value to DOCUMENT/CONTENT/NULL makes things a touch more explicit,
> the
> same results can be achieved by simply running:
>
> SELECT data::xml FROM mixed WHERE xml_is_well_formed(data) AND
> data::xml IS DOCUMENT;
Note that this wouldn't necessarily work because it is not guaranteed
that the well-formedness test is executed before the cast to xml. SQL
doesn't short-circuit left to right. (A CASE expression could work.)
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