--- /dev/null
+(* 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/.
+ *)
+
+let default_connection_string =
+ "dbname=mowgli_test user=helm"
+
+let connection = ref None
+
+let connection_string =
+ try Sys.getenv "POSTGRESQL_CONNECTION_STRING"
+ with Not_found -> default_connection_string
+
+let init () =
+ try connection := Some (new Postgres.connection connection_string);
+ with _ -> raise (Failure ("MQIPostgres.init: " ^ connection_string))
+
+let close () = match ! connection with
+ | None -> ()
+ | Some c -> c#close
+
+let check () = ! connection <> None
+
+let exec q = match ! connection with
+ | None -> []
+ | Some c -> (c#exec q)#get_list
+
+let quote s =
+ let rec quote_aux s =
+ try
+ let l = String.length s in
+ let i = String.index s '\'' in
+ String.sub s 0 i ^ "\\'" ^ quote_aux (String.sub s (succ i) (l - (succ i)))
+ with Not_found -> s
+ in
+ "'" ^ quote_aux s ^ "'"