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;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
;;;; *************************************************************************
;;;; FILE IDENTIFICATION
;;;;
;;;; Name: initialize.lisp
;;;; Purpose: Initializion routines for db backend
;;;; Programmers: Kevin M. Rosenberg
;;;; Date Started: May 2002
;;;;
;;;; This file, part of CLSQL, is Copyright (c) 2002-2010 by Kevin M. Rosenberg
;;;; and Copyright (c) 1999-2001 by Pierre R. Mai
;;;;
;;;; 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-sys)
(defvar *loaded-database-types* nil
"Contains a list of database types which have been defined/loaded.")
(defmethod database-type-load-foreign (x)
(error "No generic function defined for database-type-load-foreign with parameters of ~S" x))
(defmethod database-type-load-foreign :after (database-type)
(when (database-type-library-loaded database-type)
(pushnew database-type *loaded-database-types*)))
(defun reload-database-types ()
"Reloads any foreign code for the loaded database types after a dump."
(mapc #'database-type-load-foreign *loaded-database-types*))
(defvar *default-database-type* nil
"Designates the default database type which is initialised by
the function INITIALISE-DATABASE-TYPE.")
(defvar *initialized-database-types* nil
"A list of database types which have currently been initialised
by calling INITIALIZE-DATABASE-TYPE.")
(defun initialize-database-type (&key (database-type *default-database-type*))
"Initializes the supplied DATABASE-TYPE, if it is not already
initialized, as indicated by *INITIALIZED-DATABASE-TYPES* and
returns DATABASE-TYPE. *DEFAULT-DATABASE-TYPE* is set to
DATABASE-TYPE and, if DATABASE-TYPE has not been initialised, it
is added to *INITIALIZED-DATABASE-TYPES*. "
(when (member database-type *initialized-database-types*)
(return-from initialize-database-type database-type))
(let ((system (intern (concatenate 'string
(symbol-name '#:clsql-)
(symbol-name database-type)))))
(when (not (find-package system))
(asdf:operate 'asdf:load-op system)))
(when (database-initialize-database-type database-type)
(push database-type *initialized-database-types*)
(setf *default-database-type* database-type)
database-type))
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