lisp/ob-sql.el

   1 ;;; ob-sql.el --- org-babel functions for sql evaluation
   2
   3 ;; Copyright (C) 2009-2011  Free Software Foundation, Inc.
   4
   5 ;; Author: Eric Schulte
   6 ;; Keywords: literate programming, reproducible research
   7 ;; Homepage: http://orgmode.org
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Org-Babel support for evaluating sql source code.
  27 ;;
  28 ;; SQL is somewhat unique in that there are many different engines for
  29 ;; the evaluation of sql (Mysql, PostgreSQL, etc...), so much of this
  30 ;; file will have to be implemented engine by engine.
  31 ;;
  32 ;; Also SQL evaluation generally takes place inside of a database.
  33 ;;
  34 ;; For now lets just allow a generic ':cmdline' header argument.
  35 ;;
  36 ;; TODO:
  37 ;;
  38 ;; - support for sessions
  39 ;; - add more useful header arguments (user, passwd, database, etc...)
  40 ;; - support for more engines (currently only supports mysql)
  41 ;; - what's a reasonable way to drop table data into SQL?
  42 ;;
  43
  44 ;;; Code:
  45 (require 'ob)
  46 (eval-when-compile (require 'cl))
  47
  48 (declare-function org-table-import "org-table" (file arg))
  49 (declare-function orgtbl-to-csv "org-table" (TABLE PARAMS))
  50
  51 (defvar org-babel-default-header-args:sql '())
  52
  53 (defun org-babel-expand-body:sql (body params)
  54   "Expand BODY according to the values of PARAMS."
  55   (org-babel-sql-expand-vars
  56    body (mapcar #'cdr (org-babel-get-header params :var))))
  57
  58 (defun org-babel-execute:sql (body params)
  59   "Execute a block of Sql code with Babel.
  60 This function is called by `org-babel-execute-src-block'."
  61   (let* ((result-params (cdr (assoc :result-params params)))
  62          (cmdline (cdr (assoc :cmdline params)))
  63          (engine (cdr (assoc :engine params)))
  64          (in-file (org-babel-temp-file "sql-in-"))
  65          (out-file (or (cdr (assoc :out-file params))
  66                        (org-babel-temp-file "sql-out-")))
  67          (header-delim "")
  68          (command (case (intern engine)
  69                     ('msosql (format "osql %s -s \"\t\" -i %s -o %s"
  70                                      (or cmdline "")
  71                                      (org-babel-process-file-name in-file)
  72                                      (org-babel-process-file-name out-file)))
  73                     ('mysql (format "mysql %s < %s > %s"
  74                                     (or cmdline "")
  75                                     (org-babel-process-file-name in-file)
  76                                     (org-babel-process-file-name out-file)))
  77                     ('postgresql (format
  78                                   "psql -A -P footer=off -F \"\t\"  -f %s -o %s %s"
  79                                     (org-babel-process-file-name in-file)
  80                                     (org-babel-process-file-name out-file)
  81                                     (or cmdline "")))
  82                     (t (error "no support for the %s sql engine" engine)))))
  83     (with-temp-file in-file
  84       (insert (org-babel-expand-body:sql body params)))
  85     (message command)
  86     (shell-command command)
  87     (if (or (member "scalar" result-params)
  88             (member "verbatim" result-params)
  89             (member "html" result-params)
  90             (member "code" result-params)
  91             (equal (point-min) (point-max)))
  92         (with-temp-buffer
  93           (progn (insert-file-contents-literally out-file) (buffer-string)))
  94       (with-temp-buffer
  95         ;; need to figure out what the delimiter is for the header row
  96         (with-temp-buffer
  97           (insert-file-contents out-file)
  98           (goto-char (point-min))
  99           (when (re-search-forward "^\\(-+\\)[^-]" nil t)
 100             (setq header-delim (match-string-no-properties 1)))
 101           (goto-char (point-max))
 102           (forward-char -1)
 103           (while (looking-at "\n")
 104             (delete-char 1)
 105             (goto-char (point-max))
 106             (forward-char -1))
 107           (write-file out-file))
 108         (org-table-import out-file '(16))
 109         (org-babel-reassemble-table
 110          (mapcar (lambda (x)
 111                    (if (string= (car x) header-delim)
 112                        'hline
 113                      x))
 114                  (org-table-to-lisp))
 115          (org-babel-pick-name (cdr (assoc :colname-names params))
 116                               (cdr (assoc :colnames params)))
 117          (org-babel-pick-name (cdr (assoc :rowname-names params))
 118                               (cdr (assoc :rownames params))))))))
 119
 120 (defun org-babel-sql-expand-vars (body vars)
 121   "Expand the variables held in VARS in BODY."
 122   (mapc
 123    (lambda (pair)
 124      (setq body
 125            (replace-regexp-in-string
 126             (format "\$%s" (car pair))
 127             ((lambda (val)
 128                (if (listp val)
 129                    ((lambda (data-file)
 130                       (with-temp-file data-file
 131                         (insert (orgtbl-to-csv
 132                                  val '(:fmt (lambda (el) (if (stringp el)
 133                                                         el
 134                                                       (format "%S" el)))))))
 135                       data-file)
 136                     (org-babel-temp-file "sql-data-"))
 137                  (if (stringp val) val (format "%S" val))))
 138              (cdr pair))
 139             body)))
 140    vars)
 141   body)
 142
 143 (defun org-babel-prep-session:sql (session params)
 144   "Raise an error because Sql sessions aren't implemented."
 145   (error "sql sessions not yet implemented"))
 146
 147 (provide 'ob-sql)
 148
 149
 150
 151 ;;; ob-sql.el ends here