-
(* Copyright (C) 2000, HELM Team.
*
* This file is part of HELM, an Hypertextual, Electronic
* http://cs.unibo.it/helm/.
*)
+(* AUTOR: Ferruccio Guidi <fguidi@cs.unibo.it>
+ *)
+
module M = MathQL
-module P = MQIPostgres
+module C = MQIConn
module U = MQIUtil
+module A = MQIMap
let not_supported s =
raise (Failure ("MQIProperty: feature not supported: " ^ s))
in
List.iter c_print l
-(* PostgreSQL backend ******************************************************)
+(* Common functions ********************************************************)
-let pg_query table cols ct cf =
- let rec iter f sep = function
- | [] -> ""
- | [head] -> f head
- | head :: tail -> f head ^ sep ^ iter f sep tail
- in
- let pg_cols = iter (fun x -> x) ", " cols in
- let pg_msval v = iter P.quote ", " v in
- let pg_con (pat, col, v) =
- if col <> "" then
- let f s = col ^ " ~ " ^ P.quote ("^" ^ s ^ "$") in
- if pat then "(" ^ iter f " or " v ^ ")"
- else col ^ " in (" ^ pg_msval v ^ ")"
- else "true"
- in
- let pg_cons l = iter pg_con " and " l in
- let pg_cons_not l = "not (" ^ pg_cons l ^ ")" in
- let pg_where = match ct, cf with
- | [], [] -> ""
- | lt, [] -> " where " ^ pg_cons lt
- | [], lf -> " where " ^ pg_cons_not lf
- | lt, lf -> " where " ^ pg_cons lt ^ " and " ^ pg_cons_not lf
- 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
-
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
in
compose mk_avs res
-let get_table mc ct cf 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) cf) 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 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 conv = function
- | [] -> "source"
- | ["objectname"] -> "value"
- | [t] -> ""
- | [_; t] -> decolon t
- | _ -> not_supported "conv"
-
-let postgres_single mc ct cf el t =
- let table = match t with Some t -> decolon t | None -> "objectname" in
+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 = mk_con cf 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 out q = if C.set h C.Queries then C.log h (q ^ "\n") in
+ let r = C.exec h out (C.resolve h table) cols cons_true cons_false in
+ pg_result false first el r
let deadline = 100
-let postgres refine mc ct cf el =
- if refine <> M.RefineExact then not_supported "postgres";
- cl_print ct;
- let table = get_table mc ct cf 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 cf el table
- in postgres_aux ct
-
-(* Galax backend ***********************************************************)
-
-let galax refine mc ct cf el = not_supported "Galax"
-
-(* funzioni vecchie ********************************************************)
-
-let pg_name s =
- let q = "select id from registry where uri = " ^ P.quote s in
- match P.exec q with
- | [[id]] -> "t" ^ id
- | _ -> ""
-
-let get_id b = if b then ["B"] else ["F"]
+ exec_single h mc ct cfl el table
+ in exec_aux ct
projects / helm.git / blobdiff