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+;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
+;;;; *************************************************************************
+;;;; FILE IDENTIFICATION
+;;;;
+;;;; Name:          aodbc-sql.cl
+;;;; Purpose:       Low-level interface for CLSQL AODBC backend
+;;;; Programmer:    Kevin M. Rosenberg
+;;;; Date Started:  Feb 2002
+;;;;
+;;;; This file, part of CLSQL, is Copyright (c) 2002 by Kevin M. Rosenberg
+;;;;
+;;;; CLSQL users are granted the rights to distribute and use this software
+;;;; as governed by the terms of the Lisp Lesser GNU Public License
+;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
+;;;; *************************************************************************
+
+(in-package #:clsql-aodbc)
+
+;; interface foreign library loading routines
+(defmethod clsql-sys:database-type-library-loaded ((database-type (eql :aodbc)))
+  "T if foreign library was able to be loaded successfully. "
+  (when (find-package :dbi) ;; finds Allegro's DBI (AODBC) package
+    t))
+
+(defmethod clsql-sys:database-type-load-foreign ((databae-type (eql :aodbc)))
+  t)
+
+(when (find-package :dbi)
+  (clsql-sys:database-type-load-foreign :aodbc))
+
+
+;; AODBC interface
+
+(defclass aodbc-database (generic-odbc-database)
+  ((aodbc-db-type :accessor database-aodbc-db-type :initform :unknown)))
+
+(defmethod database-name-from-spec (connection-spec
+                                    (database-type (eql :aodbc)))
+  (check-connection-spec connection-spec database-type (dsn user password))
+  (destructuring-bind (dsn user password) connection-spec
+    (declare (ignore password))
+    (concatenate 'string dsn "/" user)))
+
+(defmethod database-connect (connection-spec (database-type (eql :aodbc)))
+  (check-connection-spec connection-spec database-type (dsn user password))
+  #+aodbc-v2
+  (destructuring-bind (dsn user password) connection-spec
+    (handler-case
+        (make-instance 'aodbc-database
+          :name (database-name-from-spec connection-spec :aodbc)
+          :database-type :aodbc
+          :dbi-package (find-package '#:dbi)
+          :odbc-conn
+          (dbi:connect :user user
+                       :password password
+                       :data-source-name dsn))
+      (sql-error (e)
+        (error e))
+      (error ()         ;; Init or Connect failed
+        (error 'sql-connection-error
+               :database-type database-type
+               :connection-spec connection-spec
+               :message "Connection failed")))))
+
+
+(defmethod database-query (query-expression (database aodbc-database)
+                           result-types field-names)
+  #+aodbc-v2
+  (handler-case
+      (dbi:sql query-expression
+               :db (clsql-sys::odbc-conn database)
+               :types result-types
+               :column-names field-names)
+    #+ignore
+    (error ()
+      (error 'sql-database-data-error
+             :database database
+             :expression query-expression
+             :message "Query failed"))))
+
+(defmethod database-create (connection-spec (type (eql :aodbc)))
+  (warn "Not implemented."))
+
+(defmethod database-destroy (connection-spec (type (eql :aodbc)))
+  (warn "Not implemented."))
+
+(defmethod database-probe (connection-spec (type (eql :aodbc)))
+  (warn "Not implemented."))
+
+;;; Backend capabilities
+
+(defmethod database-underlying-type ((database aodbc-database))
+  (database-aodbc-db-type database))
+
+(defmethod db-backend-has-create/destroy-db? ((db-type (eql :aodbc)))
+  nil)
+
+(defmethod database-initialize-database-type ((database-type (eql :aodbc)))
+  t)
+
+(when (clsql-sys:database-type-library-loaded :aodbc)
+  (clsql-sys:initialize-database-type :database-type :aodbc))