help, pass variables

[carpetascatastro at laplata.gov.ar]

 Hi, I have a SDF that has a key and a URL path. When I select a parcel I get a
URL and I want to pass the variable key to my index path, but, of course, I
don't know how.
What I want to do is use that variable key to connect to my data base, is it
possible to do?
Thanks a lot, 
Oscar. 


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