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+;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
+;;;; *************************************************************************
+;;;; FILE IDENTIFICATION
+;;;;
+;;;; Name:          functional.cl
+;;;; Purpose:       Functional interface
+;;;; Programmer:    Pierre R. Mai
+;;;;
+;;;; Copyright (c) 1999-2001 Pierre R. Mai
+;;;;
+;;;; $Id: functional.cl,v 1.8 2002/09/17 17:16:43 kevin Exp $
+;;;;
+;;;; This file is part of CLSQL. 
+;;;;
+;;;; CLSQL is free software; you can redistribute it and/or modify
+;;;; it under the terms of the GNU General Public License (version 2) as
+;;;; published by the Free Software Foundation.
+;;;;
+;;;; CLSQL 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 CLSQL; if not, write to the Free Software Foundation, Inc.,
+;;;; 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+;;;; *************************************************************************
+
+(declaim (optimize (debug 3) (speed 3) (safety 1) (compilation-speed 0)))
+(in-package :clsql-sys)
+
+
+;;;; This file implements the more advanced functions of the
+;;;; functional SQL interface, which are just nicer layers above the
+;;;; basic SQL interface.
+
+(defun insert-records
+    (&key into attributes values av-pairs query (database *default-database*))
+  "Insert records into the given table according to the given options."
+  (cond
+    ((and av-pairs (or attributes values))
+     (error "Supply either av-pairs or values (and possibly attributes) to call of insert-records."))
+    ((and (or av-pairs values) query)
+     (error
+      "Supply either query or values/av-pairs to call of insert-records."))
+    ((and attributes (not query)
+          (or (not (listp values)) (/= (length attributes) (length values))))
+     (error "You must supply a matching values list when using attributes in call of insert-records."))
+    (query
+     (execute-command
+      (format nil "insert into ~A ~@[(~{~A~^,~}) ~]~A" into attributes query)
+      :database database))
+    (t
+     (execute-command
+      (multiple-value-bind (attributes values)
+          (if av-pairs
+              (values (mapcar #'first av-pairs) (mapcar #'second av-pairs))
+              (values attributes values))
+	(format nil "insert into ~A ~@[(~{~A~^,~}) ~]values (~{'~A'~^,~})"
+		into attributes values))
+      :database database))))
+
+(defun delete-records (&key from where (database *default-database*))
+  "Delete the indicated records from the given database."
+  (execute-command (format nil "delete from ~A ~@[where ~A ~]" from where)
+                   :database database))
+
+(defun update-records (table &key attributes values av-pairs where (database *default-database*))
+  "Update the specified records in the given database."
+  (cond
+    ((and av-pairs (or attributes values))
+     (error "Supply either av-pairs or values (and possibly attributes) to call of update-records."))
+    ((and attributes
+          (or (not (listp values)) (/= (length attributes) (length values))))
+     (error "You must supply a matching values list when using attributes in call of update-records."))
+    ((or (and attributes (not values)) (and values (not attributes)))
+     (error "You must supply both values and attributes in call of update-records."))
+    (t
+     (execute-command
+      (format nil "update ~A set ~:{~A = '~A'~:^, ~}~@[ where ~A~]"
+              table
+              (or av-pairs
+                  (mapcar #'list attributes values))
+              where)
+      :database database))))
+
+(defmacro with-database ((db-var connection-spec &rest connect-args) &body body)
+  "Evaluate the body in an environment, where `db-var' is bound to the
+database connection given by `connection-spec' and `connect-args'.
+The connection is automatically closed or released to the pool on exit from the body."
+  (let ((result (gensym "result-")))
+    (unless db-var (setf db-var '*default-database*))
+    `(let ((,db-var (connect ,connection-spec ,@connect-args))
+	   (,result nil))
+      (unwind-protect
+	   (let ((,db-var ,db-var))
+	     (setf ,result (progn ,@body)))
+	(disconnect :database ,db-var))
+      ,result)))
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