Need to Parse or Read XML into a ResultSet

Question

Hi, I see lots of examples of folks reading from a database, populating a ResultSet, and then putting that data into an XML document. I don't see any reference to going the other way, and was hoping some of you might have an insight on how to do this.
We have a huge historical database and want to take the older info, put it into xml format, zip it, and store the zip'd result as a blob. That's the easy part.
We want to be able to go back, to read the blob, unzip it, and then populate a ResultSet and return that to the caller. I don't see any slick methodology to either 1.) instantiate an empty ResultSet or 2.) parse/read an XML structure into a ResultSet.
Any bright ideas?
Thanks, John

Answer 1

@maggie: That is easily done with XPath expressions, for example:
xmlstarlet sel -t -m '//servers[@country_code="us"]' -c '.' -n vpn.xml
xmlstarlet sel -T -t -m '//servers[@country_code="us"]' -v @public_name -o " " -v @bw -n vpn.xml
xmlstarlet sel -t -m '//servers[@country_code="us"]' -v '@public_name' -o ": " -v '@currentload' -n vpn.xml
xmlstarlet sel -t -m '//servers[@country_code="us" and @currentload<15]' -v '@public_name' -o ": " -v '@currentload' -n vpn.xml
xmlstarlet sel -t -m '//servers[@currentload<15]' -v '@public_name' -o ": " -v '@currentload' -n vpn.xml
http://www.w3schools.com/xpath/default.asp
Edit: If you use json and jshon, then you'll have to do the sorting and filtering in the shell
jshon -e servers -a -e country_code -u -p -e public_name -u -p -e bw -u <vpn.json | {
# filter country_code
while read -r country_code && read -r public_name && read -r bw; do
[ x"$country_code" = x"ca" ] && echo "$public_name $bw";
done
} | sort -k2,2nr -k1,1d # sort second field (bw) numeric reverse, if equal use dictionary sort on first (name)
Last edited by progandy (2015-05-31 05:47:50)