On 03/12/2014 09:36 AM, Ashoke wrote:
I am working on adding a functionality to PostgreSQL. I need to
parse the XML format query plan (produced by PostgreSQL v9.3) and save
it in a simple data structure (say C structure). I was wondering if
PostgreSQL already had any parsing functions implemented that I can
use to do the XML parsing. This is getting difficult as I was not able
to get any DTD or XML Schema for the XML files generated by PostgreSQL.
I found the files xpath.c/xslt_proc.c files that contain parsing
related code, but none of the functions are being called for any xml
related query I issue to the database and some of the functions in
those files mention as deprecated.
It would be greatly helpful if someone could guide me on this.
The only XML parsing we have is where Postgres is built with libxml, in
which case we use its parser. But query plan XML is delivered to a
client (or a log file, which means more or less the same thing here). If
you want to parse it then it should be parsed in the client - that's why
we provide it. Inside postgres I don't see a point in parsing the XML
rather than handling the query plan directly.
The worst possible option would be to make a hand-cut XML parser, either
in the client or the server - XML parsing has all sorts of wrinkles that
can bite you badly.
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