lisp/ob-sql.el

   1 ;;; ob-sql.el --- org-babel functions for sql evaluation
   2
   3 ;; Copyright (C) 2009, 2010  Free Software Foundation, Inc.
   4
   5 ;; Author: Eric Schulte
   6 ;; Keywords: literate programming, reproducible research
   7 ;; Homepage: http://orgmode.org
   8 ;; Version: 7.01trans
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;; Org-Babel support for evaluating sql source code.
  28 ;;
  29 ;; SQL is somewhat unique in that there are many different engines for
  30 ;; the evaluation of sql (Mysql, PostgreSQL, etc...), so much of this
  31 ;; file will have to be implemented engine by engine.
  32 ;;
  33 ;; Also SQL evaluation generally takes place inside of a database.
  34 ;;
  35 ;; For now lets just allow a generic ':cmdline' header argument.
  36 ;;
  37 ;; TODO:
  38 ;;
  39 ;; - support for sessions
  40 ;; - add more useful header arguments (user, passwd, database, etc...)
  41 ;; - support for more engines (currently only supports mysql)
  42 ;; - what's a reasonable way to drop table data into SQL?
  43 ;;
  44
  45 ;;; Code:
  46 (require 'ob)
  47 (eval-when-compile (require 'cl))
  48
  49 (declare-function org-table-import "org-table" (file arg))
  50
  51 (defvar org-babel-default-header-args:sql '())
  52
  53 (defun org-babel-expand-body:sql (body params &optional processed-params)
  54   "Expand BODY according to PARAMS, return the expanded body." body)
  55
  56 (defun org-babel-execute:sql (body params)
  57   "Execute a block of Sql code with Babel.
  58 This function is called by `org-babel-execute-src-block'."
  59   (let* ((result-params (split-string (or (cdr (assoc :results params)) "")))
  60          (processed-params (org-babel-process-params params))
  61          (cmdline (cdr (assoc :cmdline params)))
  62          (engine (cdr (assoc :engine params)))
  63          (in-file (org-babel-temp-file "sql-in-"))
  64          (out-file (or (cdr (assoc :out-file params))
  65                        (org-babel-temp-file "sql-out-")))
  66          (command (case (intern engine)
  67                     ('mysql (format "mysql %s -e \"source %s\" > %s"
  68                                     (or cmdline "") in-file out-file))
  69                     (t (error "no support for the %s sql engine" engine)))))
  70     (with-temp-file in-file
  71       (insert (org-babel-expand-body:sql body params)))
  72     (message command)
  73     (shell-command command)
  74     (with-temp-buffer
  75       (org-table-import out-file nil)
  76       (org-babel-reassemble-table
  77        (org-table-to-lisp)
  78        (org-babel-pick-name (nth 4 processed-params) (cdr (assoc :colnames params)))
  79        (org-babel-pick-name (nth 5 processed-params) (cdr (assoc :rownames params)))))))
  80
  81
  82 (defun org-babel-prep-session:sql (session params)
  83   "Raise an error because Sql sessions aren't implemented."
  84   (error "sql sessions not yet implemented"))
  85
  86 (provide 'ob-sql)
  87
  88 ;; arch-tag: a43ff944-6de1-4566-a83c-626814e3dad2
  89
  90 ;;; ob-sql.el ends here