X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Fmathql_interpreter%2FmQIProperty.ml;h=0433afd5eb37fdd051be9136204a15e81f5ede6c;hb=330d38a70331b13205cd3aabc420b3a112819346;hp=56a9d64212d44ea9bd0e4de0472b54da0957402f;hpb=99bd3d38d021bb5c618883e8a484891f227082c3;p=helm.git

diff --git a/helm/ocaml/mathql_interpreter/mQIProperty.ml b/helm/ocaml/mathql_interpreter/mQIProperty.ml
index 56a9d6421..0433afd5e 100644
--- a/helm/ocaml/mathql_interpreter/mQIProperty.ml
+++ b/helm/ocaml/mathql_interpreter/mQIProperty.ml
@@ -1,4 +1,3 @@
-
 (* Copyright (C) 2000, HELM Team.
  * 
  * This file is part of HELM, an Hypertextual, Electronic
@@ -24,9 +23,14 @@
  * http://cs.unibo.it/helm/.
  *)
 
+(*  AUTOR: Ferruccio Guidi <fguidi@cs.unibo.it>
+ *)
+
 module M = MathQL
-module P = MQIPostgres
+module P = MQIDataBase
+module C = MQIConn
 module U = MQIUtil
+module A = MQIMap
 
 let not_supported s = 
    raise (Failure ("MQIProperty: feature not supported: " ^ s)) 
@@ -51,7 +55,11 @@ let cl_print l =
 
 (* PostgreSQL backend  ******************************************************)
 
-let pg_query table cols ct cfl =
+let pg_query h table cols ct cfl =
+   let exec q = 
+      if C.set h C.Queries then C.log h (q ^ "\n");
+      P.exec (C.pgc h) q 
+   in
    let rec iter f sep = function
       | []           -> ""
       | [head]       -> f head 
@@ -77,12 +85,21 @@ let pg_query table cols ct cfl =
       | [], llf -> " where " ^ pg_cons_not_l llf
       | lt, llf -> " where " ^ pg_cons lt ^ " and " ^ pg_cons_not_l llf
    in
-   if cols = [] then [] else begin
-      let q = "select " ^ pg_cols ^ " from " ^ table ^ pg_where ^ 
-              " order by " ^ List.hd cols ^ " asc" in
-      prerr_endline q;      
-      P.exec q end
-   
+   if cols = [] then
+      let r = exec ("select count (source) from " ^ table ^ pg_where) in
+      match r with
+         | [[s]] when int_of_string s > 0 -> [[]]
+	 | _                              -> []
+   else
+      exec ("select " ^ pg_cols ^ " from " ^ table ^ pg_where ^ 
+            " order by " ^ List.hd cols ^ " asc")
+
+(* Galax backend  ***********************************************************)
+
+let gx_query h table cols ct cfl = not_supported "Galax"
+
+(* Common functions  ********************************************************)
+
 let pg_result distinct subj el res =
   let compose = if distinct then List.map else fun f -> U.mql_iter (fun x -> [f x]) in 
   let get_name = function (p, None) -> p | (_, Some p) -> p in
@@ -96,73 +113,44 @@ let pg_result distinct subj el res =
   in
   compose mk_avs res
 
-let get_table mc ct cfl el =
-   let fst = function
-      | []           -> None
-      | head :: tail -> Some head
-   in
-   let comp n1 n2 = match n1, n2 with
-      | None, _                   -> n2 
-      | Some h, Some k when h = k -> n2
-      | _, None                   -> n1
-      | _                         -> not_supported "comp"
-   in   
-   let rec get_c prev = function
-      | []                -> prev
-      | (_, p, _) :: tail -> get_c (comp prev (fst p)) tail
-   in
-   let rec get_e prev = function
-      | []             -> prev
-      | (p, _) :: tail -> get_e (comp prev (fst p)) tail
-   in
-   get_e (get_c (get_c (fst mc) ct) (List.concat cfl)) el  
-
-let rec decolon s =
-   let l = String.length s in
-   try 
-      let i = String.index s ':' in
-      String.sub s 0 i ^ "_" ^ decolon (String.sub s (succ i) (l - succ i))
-   with Not_found -> s
-
-let conv = function
-   | []             -> "source"
-   | ["objectName"] -> "value" 
-   | [t]            -> ""
-   | [_; t]         -> decolon t
-   | _              -> not_supported "conv" 
-
-let postgres_single mc ct cfl el t =
-   let table = match t with Some t -> decolon t | None -> "objectName" in
+let get_table h mc ct cfl el =
+   let aux_c ts (_, p, _) = A.refine_tables ts (C.tables h p) in
+   let aux_e ts (p, _) = A.refine_tables ts (C.tables h p) in
+   let fst = C.tables h mc in
+   let snd = List.fold_left aux_c fst (ct @ (List.concat cfl)) in
+   let trd = List.fold_left aux_e snd el in
+   A.default_table trd
+
+let exec_single h mc ct cfl el table =
+   let conv p = C.field h p table in
    let first = conv mc in
    let mk_con l = List.map (fun (pat, p, v) -> (pat, conv p, v)) l in
    let cons_true = mk_con ct in 
    let cons_false = List.map mk_con cfl in
    let other_cols = List.map (fun (p, _) -> conv p) el in 
-   let cols = if first = "" then other_cols else first :: other_cols in 
-   pg_result false first el (pg_query table cols cons_true cons_false) 
+   let cols = if first = "" then other_cols else first :: other_cols in
+   let low_level = if C.set h C.Galax then gx_query else pg_query in
+   let result = low_level h (C.resolve h table) cols cons_true cons_false in
+   pg_result false first el result 
    
 let deadline = 100
 
-let postgres refine mc ct cfl el =
-   if refine <> M.RefineExact then not_supported "postgres";   
-   let table = get_table mc ct cfl el in
-   let rec postgres_aux ct = match ct with 
+let exec h refine mc ct cfl el =
+   if refine <> M.RefineExact then not_supported "exec";   
+   let table = get_table h mc ct cfl el in
+   let rec exec_aux ct = match ct with 
       | (pat, p, v) :: tail when List.length v > deadline ->
-         let single s = postgres_aux ((pat, p, [s]) :: tail) in
+         let single s = exec_aux ((pat, p, [s]) :: tail) in
 	 U.mql_iter single v
       | _                                                 ->
-         postgres_single mc ct cfl el table
-   in postgres_aux ct	 
-
-(* Galax backend  ***********************************************************)
-
-let galax refine mc ct cfl el = not_supported "Galax"
+         exec_single h mc ct cfl el table
+   in exec_aux ct	 
 
 (* funzioni vecchie  ********************************************************)
 
-let pg_name s = 
+let pg_name h s = 
    let q = "select id from registry where uri = " ^ P.quote s in
-   match P.exec q with
+   match P.exec h q with
       | [[id]] -> "t" ^ id
       | _      -> ""