X-Git-Url: http://git.kpe.io/?a=blobdiff_plain;f=base%2Ftransaction.lisp;fp=base%2Ftransaction.lisp;h=0000000000000000000000000000000000000000;hb=8a8ee2d7d791b7a3efaed06420802a925d16fca3;hp=61438edf2a48be4f8edda77e5480a132cd92f7d5;hpb=09f07ac9d914a83f9426609f3264f4e66b5a6d97;p=clsql.git

diff --git a/base/transaction.lisp b/base/transaction.lisp
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-;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
-;;;; *************************************************************************
-;;;;
-;;;; $Id$
-;;;;
-;;;; Transaction support
-;;;;
-;;;; This file is part of CLSQL.
-;;;;
-;;;; 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-base)
-
-(defclass transaction ()
-  ((commit-hooks :initform () :accessor commit-hooks)
-   (rollback-hooks :initform () :accessor rollback-hooks)
-   (status :initform nil :accessor transaction-status))) ; nil or :committed
-
-(defun commit-transaction (database)
-  (when (and (transaction database)
-             (not (transaction-status (transaction database))))
-    (setf (transaction-status (transaction database)) :committed)))
-
-(defun add-transaction-commit-hook (database commit-hook)
-  (when (transaction database)
-    (push commit-hook (commit-hooks (transaction database)))))
-
-(defun add-transaction-rollback-hook (database rollback-hook)
-  (when (transaction database)
-    (push rollback-hook (rollback-hooks (transaction database)))))
-
-(defmethod database-start-transaction (database)
-  (unless database (error 'clsql-no-database-error))
-  (unless (transaction database)
-    (setf (transaction database) (make-instance 'transaction)))
-  (when (= (incf (transaction-level database) 1))
-    (let ((transaction (transaction database)))
-      (setf (commit-hooks transaction) nil
-            (rollback-hooks transaction) nil
-            (transaction-status transaction) nil)
-      (execute-command "BEGIN" :database database))))
-
-(defmethod database-commit-transaction (database)
-    (if (> (transaction-level database) 0)
-        (when (zerop (decf (transaction-level database)))
-          (execute-command "COMMIT" :database database)
-          (map nil #'funcall (commit-hooks (transaction database))))
-        (warn 'clsql-simple-warning
-              :format-control "Cannot commit transaction against ~A because there is no transaction in progress."
-              :format-arguments (list database))))
-
-(defmethod database-abort-transaction (database)
-    (if (> (transaction-level database) 0)
-        (when (zerop (decf (transaction-level database)))
-          (unwind-protect 
-               (execute-command "ROLLBACK" :database database)
-            (map nil #'funcall (rollback-hooks (transaction database)))))
-        (warn 'clsql-simple-warning
-              :format-control "Cannot abort transaction against ~A because there is no transaction in progress."
-              :format-arguments (list database))))
-
-
-(defmacro with-transaction ((&key (database '*default-database*)) &rest body)
-  "Executes BODY within a transaction for DATABASE (which defaults to
-*DEFAULT-DATABASE*). The transaction is committed if the body finishes
-successfully (without aborting or throwing), otherwise the database is
-rolled back."
-  (let ((db (gensym "db-")))
-    `(let ((,db ,database))
-      (unwind-protect
-           (progn
-             (database-start-transaction ,db)
-             ,@body
-             (commit-transaction ,db))
-        (if (eq (transaction-status (transaction ,db)) :committed)
-            (database-commit-transaction ,db)
-            (database-abort-transaction ,db))))))
-
-(defun commit (&key (database *default-database*))
-  "Commits changes made to DATABASE which defaults to *DEFAULT-DATABASE*."
-  (database-commit-transaction database))
-
-(defun rollback (&key (database *default-database*))
-  "Rolls back changes made in DATABASE, which defaults to
-*DEFAULT-DATABASE* since the last commit, that is changes made since
-the last commit are not recorded."
-  (database-abort-transaction database))
-
-(defun start-transaction (&key (database *default-database*))
-  "Starts a transaction block on DATABASE which defaults to
-*default-database* and which continues until ROLLBACK or COMMIT are
-called."
-  (unless (in-transaction-p :database database)
-    (database-start-transaction database)))
-
-(defun in-transaction-p (&key (database *default-database*))
-  "A predicate to test whether we are currently within the scope of a
-transaction in DATABASE."
-  (and database (transaction database) (= (transaction-level database) 1)))