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