update of packages

lisp/emacsql/emacsql-sqlite-module.el

@@ -0,0 +1,94 @@
+;;; emacsql-sqlite-module.el --- EmacSQL back-end for SQLite using a module  -*- lexical-binding:t -*-
+
+;; This is free and unencumbered software released into the public domain.
+
+;; Author: Jonas Bernoulli <jonas@bernoul.li>
+;; Homepage: https://github.com/magit/emacsql
+
+;; Package-Version: 3.1.1.50-git
+;; Package-Requires: ((emacs "25") (emacsql "20230220") (sqlite3 "0.16"))
+;; SPDX-License-Identifier: Unlicense
+
+;;; Commentary:
+
+;; This library provides an EmacSQL back-end for SQLite, which uses
+;; the Emacs module provided by the `sqlite3' package.
+
+;;; Code:
+
+(require 'emacsql)
+(require 'emacsql-sqlite-common)
+
+(require 'sqlite3 nil t)
+(declare-function sqlite3-open "sqlite3-api")
+(declare-function sqlite3-exec "sqlite3-api")
+(declare-function sqlite3-close "sqlite3-api")
+(defvar sqlite-open-readwrite)
+(defvar sqlite-open-create)
+
+(emacsql-register-reserved emacsql-sqlite-reserved)
+
+(defclass emacsql-sqlite-module-connection (emacsql--sqlite-base) ()
+  "A connection to a SQLite database using a module.")
+
+(cl-defmethod initialize-instance :after
+  ((connection emacsql-sqlite-module-connection) &rest _)
+  (require (quote sqlite3))
+  (oset connection handle
+        (sqlite3-open (or (slot-value connection 'file) ":memory:")
+                      sqlite-open-readwrite
+                      sqlite-open-create))
+  (when emacsql-global-timeout
+    (emacsql connection [:pragma (= busy-timeout $s1)]
+             (/ (* emacsql-global-timeout 1000) 2)))
+  (emacsql connection [:pragma (= foreign-keys on)])
+  (emacsql-register connection))
+
+(cl-defun emacsql-sqlite-module (file &key debug)
+  "Open a connected to database stored in FILE.
+If FILE is nil use an in-memory database.
+
+:debug LOG -- When non-nil, log all SQLite commands to a log
+buffer. This is for debugging purposes."
+  (let ((connection (make-instance #'emacsql-sqlite-module-connection
+                                   :file file)))
+    (when debug
+      (emacsql-enable-debugging connection))
+    connection))
+
+(cl-defmethod emacsql-live-p ((connection emacsql-sqlite-module-connection))
+  (and (oref connection handle) t))
+
+(cl-defmethod emacsql-close ((connection emacsql-sqlite-module-connection))
+  (sqlite3-close (oref connection handle))
+  (oset connection handle nil))
+
+(cl-defmethod emacsql-send-message
+  ((connection emacsql-sqlite-module-connection) message)
+  (condition-case err
+      (let (rows)
+        (sqlite3-exec (oref connection handle)
+                      message
+                      (lambda (_ row __)
+                        (push (mapcar (lambda (col)
+                                        (cond ((null col) nil)
+                                              ((equal col "") "")
+                                              (t (read col))))
+                                      row)
+                              rows)))
+        (nreverse rows))
+    ((db-error sql-error)
+     (pcase-let* ((`(,_ ,errmsg ,errcode) err)
+                  (`(,_ ,_ ,signal ,errstr)
+                   (assq errcode emacsql-sqlite-error-codes)))
+       (signal (or signal 'emacsql-error)
+               (list errmsg errcode nil errstr))))
+    (error
+     (signal 'emacsql-error (cdr err)))))
+
+(cl-defmethod emacsql ((connection emacsql-sqlite-module-connection) sql &rest args)
+  (emacsql-send-message connection (apply #'emacsql-compile connection sql args)))
+
+(provide 'emacsql-sqlite-module)
+
+;;; emacsql-sqlite-module.el ends here