X-Git-Url: http://git.kpe.io/?p=clsql.git;a=blobdiff_plain;f=sql%2Floop-extension.lisp;fp=sql%2Floop-extension.lisp;h=d19dfb65ac080ce77815743c45db13b803e6d880;hp=0000000000000000000000000000000000000000;hb=7d50938ba2db52a713498e49aa1679deae6f0b6b;hpb=998937376fa6f9ce29bd3c7954fb0ebca91c37d7

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+;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
+;;;; *************************************************************************
+;;;; FILE IDENTIFICATION
+;;;;
+;;;; Name:          loop-extension.cl
+;;;; Purpose:       Extensions to the Loop macro for CMUCL
+;;;; Programmer:    Pierre R. Mai
+;;;;
+;;;; Copyright (c) 1999-2001 Pierre R. Mai
+;;;;
+;;;; $Id: loop-extension.lisp,v 1.1 2002/09/30 10:19:23 kevin Exp $
+;;;;
+;;;; The functions in this file were orignally distributed in the
+;;;; MaiSQL package in the file sql/sql.cl
+;;;; *************************************************************************
+
+(in-package :cl-user)
+
+;;;; MIT-LOOP extension
+
+#+cmu
+(defun loop-record-iteration-path (variable data-type prep-phrases)
+  (let ((in-phrase nil)
+	(from-phrase nil))
+    (loop for (prep . rest) in prep-phrases
+	  do
+	  (case prep
+	    ((:in :of)
+	     (when in-phrase
+	       (ansi-loop::loop-error
+		"Duplicate OF or IN iteration path: ~S." (cons prep rest)))
+	     (setq in-phrase rest))
+	    ((:from)
+	     (when from-phrase
+	       (ansi-loop::loop-error
+		"Duplicate FROM iteration path: ~S." (cons prep rest)))
+	     (setq from-phrase rest))
+	    (t
+	     (ansi-loop::loop-error
+	      "Unknown preposition: ~S." prep))))
+    (unless in-phrase
+      (ansi-loop::loop-error "Missing OF or IN iteration path."))
+    (unless from-phrase
+      (setq from-phrase '(*default-database*)))
+    (cond
+      ((consp variable)
+       (let ((query-var (ansi-loop::loop-gentemp 'loop-record-))
+	     (db-var (ansi-loop::loop-gentemp 'loop-record-database-))
+	     (result-set-var (ansi-loop::loop-gentemp
+			      'loop-record-result-set-))
+	     (step-var (ansi-loop::loop-gentemp 'loop-record-step-)))
+	 (push `(when ,result-set-var
+		 (database-dump-result-set ,result-set-var ,db-var))
+	       ansi-loop::*loop-epilogue*)
+	 `(((,variable nil ,data-type) (,query-var ,(first in-phrase))
+	    (,db-var ,(first from-phrase))
+	    (,result-set-var nil)
+	    (,step-var nil))
+	   ((multiple-value-bind (%rs %cols)
+		(database-query-result-set ,query-var ,db-var)
+	      (setq ,result-set-var %rs ,step-var (make-list %cols))))
+	   ()
+	   ()
+	   (not (database-store-next-row ,result-set-var ,db-var ,step-var))
+	   (,variable ,step-var)
+	   (not ,result-set-var)
+	   ()
+	   (not (database-store-next-row ,result-set-var ,db-var ,step-var))
+	   (,variable ,step-var))))
+      (t
+       (let ((query-var (ansi-loop::loop-gentemp 'loop-record-))
+	     (db-var (ansi-loop::loop-gentemp 'loop-record-database-))
+	     (result-set-var (ansi-loop::loop-gentemp
+			      'loop-record-result-set-)))
+	 (push `(when ,result-set-var
+		 (database-dump-result-set ,result-set-var ,db-var))
+	       ansi-loop::*loop-epilogue*)
+	 `(((,variable nil ,data-type) (,query-var ,(first in-phrase))
+	    (,db-var ,(first from-phrase))
+	    (,result-set-var nil))
+	   ((multiple-value-bind (%rs %cols)
+		(database-query-result-set ,query-var ,db-var)
+	      (setq ,result-set-var %rs ,variable (make-list %cols))))
+	   ()
+	   ()
+	   (not (database-store-next-row ,result-set-var ,db-var ,variable))
+	   ()
+	   (not ,result-set-var)
+	   ()
+	   (not (database-store-next-row ,result-set-var ,db-var ,variable))
+	   ()))))))
+
+#+cmu
+(ansi-loop::add-loop-path '(record records tuple tuples)
+			  'loop-record-iteration-path
+			  ansi-loop::*loop-ansi-universe*
+			  :preposition-groups '((:of :in) (:from))
+			  :inclusive-permitted nil)