1 (* Copyright (C) 2000, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
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15 * GNU General Public License for more details.
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23 * http://www.cs.unibo.it/helm/.
27 * implementazione dei comandi USE/USED BY
34 * implementazione dei comandi USE/USED BY
37 * alist: string list list; lista su cui eseguire il comando USE/USED BY
38 * asvar: string; nome della variabile del comando use
39 * usek: string; nome della tabella in cui ricercare le occorrenze;
40 * la distinzione fra l'esecuzione del comando USE e USED BY
41 * sta nell'utilizzo della tabella 'backPointer' per USE
42 * e 'refObj' per USED BY
44 * output: string list list; lista su cui e' stato eseguito il
47 let get_prop_id prop =
48 if prop="refObj" then "F"
49 else if prop="backPointer" then "B"
54 let relation_ex rop path rset attl =
55 let usek = get_prop_id (List.hd path) in
57 let _ = print_string ("RELATION "^usek)
58 and t = Unix.time () in
62 (fun (uri1-> uri1 < uri2)
64 (fun parziale (uri,aset)->
68 (c#exec ("select id from registry where uri='" ^ uri ^ "'"))
71 "select uri, context from t" ^ tv ^ " where prop_id='" ^ usek ^
74 let res = c#exec qq in
77 [uri;context] -> {S.uri = uri ; S.attributes = [asvar, context] ; S.extra = ""}
85 print_string (" = " ^ string_of_int (List.length result) ^ ": ") ;
86 print_endline (string_of_float (Unix.time () -. t) ^ "s") ;