-        transaction.commit_unless_managed()
-        transaction.enter_transaction_management()
-        transaction.managed(True)
-
-        files_imported = 0
-        files_skipped = 0
-
-        for dir_name in directories:
-            if not os.path.isdir(dir_name):
-                print self.style.ERROR("%s: Not a directory. Skipping." % dir_name)
-            else:
-                # files queue
-                files = sorted(os.listdir(dir_name))
-                postponed = {}
-                while files:
-                    trim_query_log(0)
-                    file_name = files.pop(0)
-                    file_path = os.path.join(dir_name, file_name)
-                    file_base, ext = os.path.splitext(file_path)
-
-                    # Skip files that are not XML files
-                    if not ext == '.xml':
-                        continue
-
-                    if verbose > 0:
-                        print "Parsing '%s'" % file_path
-                    else:
-                        sys.stdout.write('.')
-                        sys.stdout.flush()
-
-                    # Import book files
-                    try:
-                        if import_picture:
-                            self.import_picture(file_path, options)
-                        else:
-                            self.import_book(file_path, options)
-
-                        files_imported += 1
-                        transaction.commit()
-
-                    except (Book.AlreadyExists, Picture.AlreadyExists):
-                        print self.style.ERROR('%s: Book or Picture already imported. Skipping. To overwrite use --force.' %
-                            file_path)
-                        files_skipped += 1
-
-                    except Book.DoesNotExist, e:
-                        if file_name not in postponed or postponed[file_name] < files_imported:
-                            # push it back into the queue, maybe the missing child will show up
-                            if verbose:
-                                print self.style.NOTICE('Waiting for missing children')
-                            files.append(file_name)
-                            postponed[file_name] = files_imported
+        with transaction.atomic():
+
+            files_imported = 0
+            files_skipped = 0
+
+            for dir_name in directories:
+                if not os.path.isdir(dir_name):
+                    print self.style.ERROR("%s: Not a directory. Skipping." % dir_name)
+                else:
+                    # files queue
+                    files = sorted(os.listdir(dir_name))
+                    postponed = {}
+                    while files:
+                        file_name = files.pop(0)
+                        file_path = os.path.join(dir_name, file_name)
+                        file_base, ext = os.path.splitext(file_path)
+
+                        # Skip files that are not XML files
+                        if not ext == '.xml':
+                            continue
+
+                        if verbose > 0:
+                            print "Parsing '%s'" % file_path