lisp/org/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: 7.7
   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 (declare-function orgtbl-to-csv "org-table" (TABLE PARAMS))
  51
  52 (defvar org-babel-default-header-args:sql '())
  53
  54 (defun org-babel-expand-body:sql (body params)
  55   "Expand BODY according to the values of PARAMS."
  56   (org-babel-sql-expand-vars
  57    body (mapcar #'cdr (org-babel-get-header params :var))))
  58
  59 (defun org-babel-execute:sql (body params)
  60   "Execute a block of Sql code with Babel.
  61 This function is called by `org-babel-execute-src-block'."
  62   (let* ((result-params (cdr (assoc :result-params params)))
  63          (cmdline (cdr (assoc :cmdline params)))
  64          (engine (cdr (assoc :engine params)))
  65          (in-file (org-babel-temp-file "sql-in-"))
  66          (out-file (or (cdr (assoc :out-file params))
  67                        (org-babel-temp-file "sql-out-")))
  68          (header-delim "")
  69          (command (case (intern engine)
  70                     ('msosql (format "osql %s -s \"\t\" -i %s -o %s"
  71                                      (or cmdline "")
  72                                      (org-babel-process-file-name in-file)
  73                                      (org-babel-process-file-name out-file)))
  74                     ('mysql (format "mysql %s < %s > %s"
  75                                     (or cmdline "")
  76                                     (org-babel-process-file-name in-file)
  77                                     (org-babel-process-file-name out-file)))
  78                     ('postgresql (format
  79                                   "psql -A -P footer=off -F \"\t\"  -f %s -o %s %s"
  80                                     (org-babel-process-file-name in-file)
  81                                     (org-babel-process-file-name out-file)
  82                                     (or cmdline "")))
  83                     (t (error "no support for the %s sql engine" engine)))))
  84     (with-temp-file in-file
  85       (insert (org-babel-expand-body:sql body params)))
  86     (message command)
  87     (shell-command command)
  88     (with-temp-buffer
  89       ;; need to figure out what the delimiter is for the header row
  90       (with-temp-buffer
  91         (insert-file-contents out-file)
  92         (goto-char (point-min))
  93         (when (re-search-forward "^\\(-+\\)[^-]" nil t)
  94           (setq header-delim (match-string-no-properties 1)))
  95         (goto-char (point-max))
  96         (forward-char -1)
  97         (while (looking-at "\n")
  98           (delete-char 1)
  99           (goto-char (point-max))
 100           (forward-char -1))
 101         (write-file out-file))
 102       (org-table-import out-file '(16))
 103       (org-babel-reassemble-table
 104        (mapcar (lambda (x)
 105                  (if (string= (car x) header-delim)
 106                      'hline
 107                    x))
 108                (org-table-to-lisp))
 109        (org-babel-pick-name (cdr (assoc :colname-names params))
 110                             (cdr (assoc :colnames params)))
 111        (org-babel-pick-name (cdr (assoc :rowname-names params))
 112                             (cdr (assoc :rownames params)))))))
 113
 114 (defun org-babel-sql-expand-vars (body vars)
 115   "Expand the variables held in VARS in BODY."
 116   (mapc
 117    (lambda (pair)
 118      (setq body
 119            (replace-regexp-in-string
 120             (format "\$%s" (car pair))
 121             ((lambda (val)
 122                (if (listp val)
 123                    ((lambda (data-file)
 124                       (with-temp-file data-file
 125                         (insert (orgtbl-to-csv
 126                                  val '(:fmt (lambda (el) (if (stringp el)
 127                                                         el
 128                                                       (format "%S" el)))))))
 129                       data-file)
 130                     (org-babel-temp-file "sql-data-"))
 131                  (if (stringp val) val (format "%S" val))))
 132              (cdr pair))
 133             body)))
 134    vars)
 135   body)
 136
 137 (defun org-babel-prep-session:sql (session params)
 138   "Raise an error because Sql sessions aren't implemented."
 139   (error "sql sessions not yet implemented"))
 140
 141 (provide 'ob-sql)
 142
 143
 144
 145 ;;; ob-sql.el ends here