-
(* 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
let not_supported s =
(* PostgreSQL backend ******************************************************)
-let pg_query table cols ct cf =
+let pg_query h table cols ct cfl =
+ let exec q =
+ if C.set h C.Log then C.log h (q ^ "\n");
+ P.exec (C.pgc h) q
+ in
let rec iter f sep = function
| [] -> ""
| [head] -> f head
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 ^ ")"
+ if pat then "(" ^ iter f " or " v ^ ")"
+ else match v with
+ | [s] -> col ^ " = " ^ (P.quote s)
+ | v -> 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
+ let pg_cons_not_l ll = iter pg_cons_not " and " ll in
+ let pg_where = match ct, cfl with
+ | [], [] -> ""
+ | lt, [] -> " where " ^ pg_cons lt
+ | [], 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
in
compose mk_avs res
-let get_table mc ct cf el =
+let get_table mc ct cfl el =
let fst = function
| [] -> None
| head :: tail -> Some head
| [] -> prev
| (p, _) :: tail -> get_e (comp prev (fst p)) tail
in
- get_e (get_c (get_c (fst mc) ct) cf) el
+ get_e (get_c (get_c (fst mc) ct) (List.concat cfl)) el
let rec decolon s =
let l = String.length s in
String.sub s 0 i ^ "_" ^ decolon (String.sub s (succ i) (l - succ i))
with Not_found -> s
-let conv = function
+let conv_bp = function
+ | [] -> "h_occurrence"
+ | [t] -> ""
+ | [_; "h:occurrence"] -> "source"
+ | [_; t] -> decolon t
+ | _ -> not_supported "conv_bp"
+
+let conv_gen = function
| [] -> "source"
- | ["objectname"] -> "value"
+ | ["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 t =
+ let table = match t with Some t -> decolon t | None -> "objectName" in
+ let table, conv =
+ if table = "backPointer" then "refObj", conv_bp else table, conv_gen
+ 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 low_level = if C.set h C.Galax then gx_query else pg_query in
+ pg_result false first el (low_level h table cols cons_true cons_false)
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 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"
+ 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
| _ -> ""
projects / helm.git / blobdiff