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* lisp/sqlite.el (with-sqlite-transaction): Don't commit changes if BODY errors out. Roll back the transaction if committing fails. (Bug#67142) * etc/NEWS: * doc/lispref/text.texi (Database): Document the error handling in 'with-sqlite-transaction'.
52 lines
1.7 KiB
EmacsLisp
52 lines
1.7 KiB
EmacsLisp
;;; sqlite.el --- Functions for interacting with sqlite3 databases -*- lexical-binding: t; -*-
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;; Copyright (C) 2021-2023 Free Software Foundation, Inc.
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;;
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;;; Code:
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(defmacro with-sqlite-transaction (db &rest body)
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"Execute BODY while holding a transaction for DB.
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If BODY completes normally, commit the changes and return
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the value of BODY.
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If BODY signals an error, or transaction commit fails, roll
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back the transaction changes."
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(declare (indent 1) (debug (form body)))
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(let ((db-var (gensym))
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(func-var (gensym))
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(res-var (gensym))
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(commit-var (gensym)))
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`(let ((,db-var ,db)
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(,func-var (lambda () ,@body))
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,res-var ,commit-var)
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(if (sqlite-available-p)
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(unwind-protect
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(progn
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(sqlite-transaction ,db-var)
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(setq ,res-var (funcall ,func-var))
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(setq ,commit-var (sqlite-commit ,db-var))
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,res-var)
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(or ,commit-var (sqlite-rollback ,db-var))))
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(funcall ,func-var))))
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(provide 'sqlite)
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;;; sqlite.el ends here
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