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+;;; ob-sql.el --- org-babel functions for sql evaluation
+
+;; Copyright (C) 2009, 2010  Free Software Foundation, Inc.
+
+;; Author: Eric Schulte
+;; Keywords: literate programming, reproducible research
+;; Homepage: http://orgmode.org
+;; Version: 7.01
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs 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 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs 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.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; 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.
+;;
+;; For now lets just allow a generic ':cmdline' header argument.
+;;
+;; TODO:
+;;
+;; - support for sessions
+;; - add more useful header arguments (user, passwd, database, etc...)
+;; - support for more engines (currently only supports mysql)
+;; - what's a reasonable way to drop table data into SQL?
+;; 
+
+;;; Code:
+(require 'ob)
+(eval-when-compile (require 'cl))
+
+(declare-function org-table-import "org-table" (file arg))
+
+(defvar org-babel-default-header-args:sql '())
+
+(defun org-babel-expand-body:sql (body params &optional processed-params)
+  "Expand BODY according to PARAMS, return the expanded body." body)
+
+(defun org-babel-execute:sql (body params)
+  "Execute a block of Sql code with Babel.
+This function is called by `org-babel-execute-src-block'."
+  (let* ((result-params (split-string (or (cdr (assoc :results params)) "")))
+	 (processed-params (org-babel-process-params params))
+         (cmdline (cdr (assoc :cmdline params)))
+         (engine (cdr (assoc :engine params)))
+         (in-file (make-temp-file "org-babel-sql-in"))
+         (out-file (or (cdr (assoc :out-file params))
+                       (make-temp-file "org-babel-sql-out")))
+         (command (case (intern engine)
+                    ('mysql (format "mysql %s -e \"source %s\" > %s"
+                                    (or cmdline "") in-file out-file))
+                    (t (error "no support for the %s sql engine" engine)))))
+    (with-temp-file in-file
+      (insert (org-babel-expand-body:sql body params)))
+    (message command)
+    (shell-command command)
+    (with-temp-buffer
+      (org-table-import out-file nil)
+      (org-babel-reassemble-table
+       (org-table-to-lisp)
+       (org-babel-pick-name (nth 4 processed-params) (cdr (assoc :colnames params)))
+       (org-babel-pick-name (nth 5 processed-params) (cdr (assoc :rownames params)))))))
+
+
+(defun org-babel-prep-session:sql (session params)
+  "Raise an error because Sql sessions aren't implemented."
+  (error "sql sessions not yet implemented"))
+
+(provide 'ob-sql)
+
+;; arch-tag: a43ff944-6de1-4566-a83c-626814e3dad2
+
+;;; ob-sql.el ends here