+(* Copyright (C) 2000, HELM Team.
+ *
+ * This file is part of HELM, an Hypertextual, Electronic
+ * Library of Mathematics, developed at the Computer Science
+ * Department, University of Bologna, Italy.
+ *
+ * HELM is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * HELM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HELM; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ *
+ * For details, see the HELM World-Wide-Web page,
+ * http://cs.unibo.it/helm/.
+ *)
+
+(* AUTOR: Ferruccio Guidi <fguidi@cs.unibo.it>
+ *)
+
+type connection = MySQL_C of HMysql.dbd
+ | Postgres_C of Postgres.connection
+ | No_C
+
+type flag = Galax | Postgres | Queries | Result | Source | Times | Warn
+
+type handle = {
+ log : string -> unit; (* logging function *)
+ set : flag list; (* options *)
+ pgc : connection; (* PG connection *)
+ pgm : MQIMap.pg_map; (* PG conversion function *)
+ pga : MQIMap.pg_alias (* PG table aliases *)
+}
+
+val string_of_flags : flag list -> string
+val flags_of_string : string -> flag list
+
+val init : ?flags:(flag list) -> ?log:(string -> unit) -> unit -> handle
+val close : handle -> unit
+val connected : handle -> bool
+val exec : handle -> (MQITypes.query -> unit) ->
+ MQITypes.table -> MQITypes.columns ->
+ string MQITypes.con_true -> string MQITypes.con_false ->
+ MQITypes.result
+
+val init_if_connected : ?flags:(flag list) -> ?log:(string -> unit) -> unit -> handle
+
+(* The following functions allow to read the handle internal fields.
+ * For exclusive use of the interpreter.
+ *)
+
+val log : handle -> string -> unit
+val set : handle -> flag -> bool
+val flags : handle -> flag list
+val tables : handle -> MathQL.path -> MQIMap.pg_tables
+val field : handle -> MathQL.path -> string -> string
+val resolve : handle -> string -> string