started along the path towards supporting SQL

lisp/langs/org-babel-sql.el

@@ -0,0 +1,70 @@
+;;; org-babel-sql.el --- org-babel functions for sql evaluation
+
+;; Copyright (C) 2009 Eric Schulte
+
+;; Author: Eric Schulte
+;; Keywords: literate programming, reproducible research
+;; Homepage: http://orgmode.org
+;; Version: 0.01
+
+;;; License:
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 3, or (at your option)
+;; any later version.
+;;
+;; This program 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 GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; Org-Babel support for evaluating sql source code.
+;;
+;; SQL is somewhat unique in that there are many different engines for
+;; the evaluation of sql (Mysql, PostgreSQL, etc...), so much of this
+;; file will have to be implemented engine by engine.
+;;
+;; Also SQL evaluation generally takes place inside of a database.
+
+;;; Code:
+(require 'org-babel)
+
+(org-babel-add-interpreter "sql")
+
+(add-to-list 'org-babel-tangle-langs '("sql" "sql"))
+
+(defun org-babel-execute:sql (body params)
+  "Execute a block of Sql code with org-babel.  This function is
+called by `org-babel-execute-src-block' via multiple-value-bind."
+  (message "executing Sql source code block")
+  )
+
+(defun org-babel-prep-session:sql (session params)
+  "Prepare SESSION according to the header arguments specified in PARAMS."
+  ;; (message "params=%S" params) ;; debugging
+  )
+
+;; helper functions
+
+(defun org-babel-sql-var-to-sql (var)
+  "Convert an elisp var into a string of sql source code
+specifying a var of the same value."
+  (if (listp var)
+      (concat "[" (mapconcat #'org-babel-sql-var-to-sql var ", ") "]")
+    (format "%S" var)))
+
+(defun org-babel-sql-table-or-string (results)
+  "If the results look like a table, then convert them into an
+Emacs-lisp table, otherwise return the results as a string."
+  )
+
+(provide 'org-babel-sql)
+;;; org-babel-sql.el ends here

org-babel.org

@@ -2499,7 +2499,13 @@ Follow the pattern set by [[file:lisp/org-babel-script.el][org-babel-script.el]]
 *** TODO perl
 This could probably be added to [[file:lisp/org-babel-script.el][org-babel-script.el]]
 *** TODO java
-*** TODO SQL
+*** STARTED SQL
+
+#+srcname: sql-example
+#+begin_src sql 
+  show tables;
+#+end_src
+
 *** DONE ditaa
 (see [[* file result types][file result types]])