sql/initialize.lisp

   1 ;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
   2 ;;;; *************************************************************************
   3 ;;;; FILE IDENTIFICATION
   4 ;;;;
   5 ;;;; Name:          initialize.lisp
   6 ;;;; Purpose:       Initializion routines for backend
   7 ;;;; Programmers:   Kevin M. Rosenberg
   8 ;;;; Date Started:  May 2002
   9 ;;;;
  10 ;;;; $Id$
  11 ;;;;
  12 ;;;; This file, part of CLSQL, is Copyright (c) 2002-2004 by Kevin M. Rosenberg
  13 ;;;; and Copyright (c) 1999-2001 by Pierre R. Mai
  14 ;;;;
  15 ;;;; CLSQL users are granted the rights to distribute and use this software
  16 ;;;; as governed by the terms of the Lisp Lesser GNU Public License
  17 ;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
  18 ;;;; *************************************************************************
  19
  20 (in-package #:clsql-sys)
  21
  22 (defvar *loaded-database-types* nil
  23   "Contains a list of database types which have been defined/loaded.")
  24
  25 (defmethod database-type-load-foreign (x)
  26   (error "No generic function defined for database-type-load-foreign with parameters of ~S" x))
  27
  28 (defmethod database-type-load-foreign :after (database-type)
  29   (when (database-type-library-loaded database-type)
  30      (pushnew database-type *loaded-database-types*)))
  31
  32 (defun reload-database-types ()
  33   "Reloads any foreign code for the loaded database types after a dump."
  34   (mapc #'database-type-load-foreign *loaded-database-types*))
  35
  36 (defvar *default-database-type* nil
  37   "Designates the default database type which is initialised by
  38   the function INITIALISE-DATABASE-TYPE.")
  39
  40 (defvar *initialized-database-types* nil
  41   "A list of database types which have currently been initialised
  42 by calling INITIALIZE-DATABASE-TYPE.")
  43
  44 (defun initialize-database-type (&key (database-type *default-database-type*))
  45   "Initializes the supplied DATABASE-TYPE, if it is not already
  46 initialized, as indicated by *INITIALIZED-DATABASE-TYPES* and
  47 returns DATABASE-TYPE. *DEFAULT-DATABASE-TYPE* is set to
  48 DATABASE-TYPE and, if DATABASE-TYPE has not been initialised, it
  49 is added to *INITIALIZED-DATABASE-TYPES*. "
  50   (when (member database-type *initialized-database-types*)
  51     (return-from initialize-database-type database-type))
  52
  53   (let ((system (intern (concatenate 'string
  54                           (symbol-name '#:clsql-)
  55                           (symbol-name database-type)))))
  56     (when (not (find-package system))
  57       (asdf:operate 'asdf:load-op system)))
  58
  59   (when (database-initialize-database-type database-type)
  60     (push database-type *initialized-database-types*)
  61     (setf *default-database-type* database-type)
  62     database-type))
  63