lisp/ob-sql.el

   1 ;;; ob-sql.el --- org-babel functions for sql evaluation
   2
   3 ;; Copyright (C) 2009-2012  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 ;; (see also ob-sqlite.el)
  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 (declare-function org-table-to-lisp "org-table" (&optional txt))
  52
  53 (defvar org-babel-default-header-args:sql '())
  54
  55 (defvar org-babel-header-args:sql
  56   '((engine   . :any)
  57     (out-file . :any)))
  58
  59 (defun org-babel-expand-body:sql (body params)
  60   "Expand BODY according to the values of PARAMS."
  61   (org-babel-sql-expand-vars
  62    body (mapcar #'cdr (org-babel-get-header params :var))))
  63
  64 (defun org-babel-execute:sql (body params)
  65   "Execute a block of Sql code with Babel.
  66 This function is called by `org-babel-execute-src-block'."
  67   (let* ((result-params (cdr (assoc :result-params params)))
  68          (cmdline (cdr (assoc :cmdline params)))
  69          (engine (cdr (assoc :engine params)))
  70          (in-file (org-babel-temp-file "sql-in-"))
  71          (out-file (or (cdr (assoc :out-file params))
  72                        (org-babel-temp-file "sql-out-")))
  73          (header-delim "")
  74          (command (case (intern engine)
  75                     ('dbi (format "dbish --batch '%s' < %s | sed '%s' > %s"
  76                                   (or cmdline "")
  77                                   (org-babel-process-file-name in-file)
  78                                   "/^+/d;s/^\|//;$d"
  79                                   (org-babel-process-file-name out-file)))
  80                     ('monetdb (format "mclient -f tab %s < %s > %s"
  81                                       (or cmdline "")
  82                                       (org-babel-process-file-name in-file)
  83                                       (org-babel-process-file-name out-file)))
  84                     ('msosql (format "osql %s -s \"\t\" -i %s -o %s"
  85                                      (or cmdline "")
  86                                      (org-babel-process-file-name in-file)
  87                                      (org-babel-process-file-name out-file)))
  88                     ('mysql (format "mysql %s < %s > %s"
  89                                     (or cmdline "")
  90                                     (org-babel-process-file-name in-file)
  91                                     (org-babel-process-file-name out-file)))
  92                     ('postgresql (format
  93                                   "psql -A -P footer=off -F \"\t\"  -f %s -o %s %s"
  94                                   (org-babel-process-file-name in-file)
  95                                   (org-babel-process-file-name out-file)
  96                                   (or cmdline "")))
  97                     (t (error "No support for the %s SQL engine" engine)))))
  98     (with-temp-file in-file
  99       (insert
 100        (case (intern engine)
 101          ('dbi "/format partbox\n")
 102          (t ""))
 103        (org-babel-expand-body:sql body params)))
 104     (message command)
 105     (shell-command command)
 106     (if (or (member "scalar" result-params)
 107             (member "verbatim" result-params)
 108             (member "html" result-params)
 109             (member "code" result-params)
 110             (equal (point-min) (point-max)))
 111         (with-temp-buffer
 112           (progn (insert-file-contents-literally out-file) (buffer-string)))
 113       (with-temp-buffer
 114         ;; need to figure out what the delimiter is for the header row
 115         (with-temp-buffer
 116           (insert-file-contents out-file)
 117           (goto-char (point-min))
 118           (when (re-search-forward "^\\(-+\\)[^-]" nil t)
 119             (setq header-delim (match-string-no-properties 1)))
 120           (goto-char (point-max))
 121           (forward-char -1)
 122           (while (looking-at "\n")
 123             (delete-char 1)
 124             (goto-char (point-max))
 125             (forward-char -1))
 126           (write-file out-file))
 127         (org-table-import out-file '(16))
 128         (org-babel-reassemble-table
 129          (mapcar (lambda (x)
 130                    (if (string= (car x) header-delim)
 131                        'hline
 132                      x))
 133                  (org-table-to-lisp))
 134          (org-babel-pick-name (cdr (assoc :colname-names params))
 135                               (cdr (assoc :colnames params)))
 136          (org-babel-pick-name (cdr (assoc :rowname-names params))
 137                               (cdr (assoc :rownames params))))))))
 138
 139 (defun org-babel-sql-expand-vars (body vars)
 140   "Expand the variables held in VARS in BODY."
 141   (mapc
 142    (lambda (pair)
 143      (setq body
 144            (replace-regexp-in-string
 145             (format "\$%s" (car pair))
 146             ((lambda (val)
 147                (if (listp val)
 148                    ((lambda (data-file)
 149                       (with-temp-file data-file
 150                         (insert (orgtbl-to-csv
 151                                  val '(:fmt (lambda (el) (if (stringp el)
 152                                                              el
 153                                                            (format "%S" el)))))))
 154                       data-file)
 155                     (org-babel-temp-file "sql-data-"))
 156                  (if (stringp val) val (format "%S" val))))
 157              (cdr pair))
 158             body)))
 159    vars)
 160   body)
 161
 162 (defun org-babel-prep-session:sql (session params)
 163   "Raise an error because Sql sessions aren't implemented."
 164   (error "SQL sessions not yet implemented"))
 165
 166 (provide 'ob-sql)
 167
 168
 169
 170 ;;; ob-sql.el ends here