lisp/ob-sql.el

   1 ;;; ob-sql.el --- org-babel functions for sql evaluation
   2
   3 ;; Copyright (C) 2009-2013 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 ;; Header args used:
  36 ;; - engine
  37 ;; - cmdline
  38 ;; - dbhost
  39 ;; - dbuser
  40 ;; - dbpassword
  41 ;; - database
  42 ;; - colnames (default, nil, means "yes")
  43 ;; - result-params
  44 ;; - out-file
  45 ;; The following are used but not really implemented for SQL:
  46 ;; - colname-names
  47 ;; - rownames
  48 ;; - rowname-names
  49 ;;
  50 ;; TODO:
  51 ;;
  52 ;; - support for sessions
  53 ;; - support for more engines (currently only supports mysql)
  54 ;; - what's a reasonable way to drop table data into SQL?
  55 ;;
  56
  57 ;;; Code:
  58 (require 'ob)
  59 (eval-when-compile (require 'cl))
  60
  61 (declare-function org-table-import "org-table" (file arg))
  62 (declare-function orgtbl-to-csv "org-table" (table params))
  63 (declare-function org-table-to-lisp "org-table" (&optional txt))
  64
  65 (defvar org-babel-default-header-args:sql '())
  66
  67 (defconst org-babel-header-args:sql
  68   '((engine            . :any)
  69     (out-file          . :any)
  70     (dbhost            . :any)
  71     (dbuser            . :any)
  72     (dbpassword        . :any)
  73     (database          . :any))
  74   "SQL-specific header arguments.")
  75
  76 (defun org-babel-expand-body:sql (body params)
  77   "Expand BODY according to the values of PARAMS."
  78   (org-babel-sql-expand-vars
  79    body (mapcar #'cdr (org-babel-get-header params :var))))
  80
  81 (defun dbstring-mysql (host user password database)
  82   "Make MySQL cmd line args for database connection.  Pass nil to omit that arg."
  83   (combine-and-quote-strings
  84    (remq nil
  85          (list (when host     (concat "-h" host))
  86                (when user     (concat "-u" user))
  87                (when password (concat "-p" password))
  88                (when database (concat "-D" database))))))
  89
  90 (defun org-babel-execute:sql (body params)
  91   "Execute a block of Sql code with Babel.
  92 This function is called by `org-babel-execute-src-block'."
  93   (let* ((result-params (cdr (assoc :result-params params)))
  94          (cmdline (cdr (assoc :cmdline params)))
  95          (dbhost (cdr (assoc :dbhost params)))
  96          (dbuser (cdr (assoc :dbuser params)))
  97          (dbpassword (cdr (assoc :dbpassword params)))
  98          (database (cdr (assoc :database params)))
  99          (engine (cdr (assoc :engine params)))
 100          (colnames-p (not (equal "no" (cdr (assoc :colnames params)))))
 101          (in-file (org-babel-temp-file "sql-in-"))
 102          (out-file (or (cdr (assoc :out-file params))
 103                        (org-babel-temp-file "sql-out-")))
 104          (header-delim "")
 105          (command (case (intern engine)
 106                     ('dbi (format "dbish --batch %s < %s | sed '%s' > %s"
 107                                   (or cmdline "")
 108                                   (org-babel-process-file-name in-file)
 109                                   "/^+/d;s/^\|//;s/(NULL)/ /g;$d"
 110                                   (org-babel-process-file-name out-file)))
 111                     ('monetdb (format "mclient -f tab %s < %s > %s"
 112                                       (or cmdline "")
 113                                       (org-babel-process-file-name in-file)
 114                                       (org-babel-process-file-name out-file)))
 115                     ('msosql (format "osql %s -s \"\t\" -i %s -o %s"
 116                                      (or cmdline "")
 117                                      (org-babel-process-file-name in-file)
 118                                      (org-babel-process-file-name out-file)))
 119                     ('mysql (format "mysql %s %s %s < %s > %s"
 120                                     (dbstring-mysql dbhost dbuser dbpassword database)
 121                                     (if colnames-p "" "-N")
 122                                     (or cmdline "")
 123                                     (org-babel-process-file-name in-file)
 124                                     (org-babel-process-file-name out-file)))
 125                     ('postgresql (format
 126                                   "psql --set=\"ON_ERROR_STOP=1\" -A -P footer=off -F \"\t\"  -f %s -o %s %s"
 127                                   (org-babel-process-file-name in-file)
 128                                   (org-babel-process-file-name out-file)
 129                                   (or cmdline "")))
 130                     (t (error "No support for the %s SQL engine" engine)))))
 131     (with-temp-file in-file
 132       (insert
 133        (case (intern engine)
 134          ('dbi "/format partbox\n")
 135          (t ""))
 136        (org-babel-expand-body:sql body params)))
 137     (message command)
 138     (org-babel-eval command "")
 139     (org-babel-result-cond result-params
 140       (with-temp-buffer
 141           (progn (insert-file-contents-literally out-file) (buffer-string)))
 142       (with-temp-buffer
 143         (cond
 144           ((or (eq (intern engine) 'mysql)
 145                (eq (intern engine) 'dbi)
 146                (eq (intern engine) 'postgresql))
 147            ;; Add header row delimiter after column-names header in first line
 148            (cond
 149             (colnames-p
 150              (with-temp-buffer
 151                (insert-file-contents out-file)
 152                (goto-char (point-min))
 153                (forward-line 1)
 154                (insert "-\n")
 155                (setq header-delim "-")
 156                (write-file out-file)))))
 157           (t
 158            ;; Need to figure out the delimiter for the header row
 159            (with-temp-buffer
 160              (insert-file-contents out-file)
 161              (goto-char (point-min))
 162              (when (re-search-forward "^\\(-+\\)[^-]" nil t)
 163                (setq header-delim (match-string-no-properties 1)))
 164              (goto-char (point-max))
 165              (forward-char -1)
 166              (while (looking-at "\n")
 167                (delete-char 1)
 168                (goto-char (point-max))
 169                (forward-char -1))
 170              (write-file out-file))))
 171         (org-table-import out-file '(16))
 172         (org-babel-reassemble-table
 173          (mapcar (lambda (x)
 174                    (if (string= (car x) header-delim)
 175                        'hline
 176                      x))
 177                  (org-table-to-lisp))
 178          (org-babel-pick-name (cdr (assoc :colname-names params))
 179                               (cdr (assoc :colnames params)))
 180          (org-babel-pick-name (cdr (assoc :rowname-names params))
 181                               (cdr (assoc :rownames params))))))))
 182
 183 (defun org-babel-sql-expand-vars (body vars)
 184   "Expand the variables held in VARS in BODY."
 185   (mapc
 186    (lambda (pair)
 187      (setq body
 188            (replace-regexp-in-string
 189             (format "\$%s" (car pair))  ;FIXME: "\$" == "$"!
 190             (let ((val (cdr pair)))
 191               (if (listp val)
 192                   (let ((data-file (org-babel-temp-file "sql-data-")))
 193                     (with-temp-file data-file
 194                       (insert (orgtbl-to-csv
 195                                val '(:fmt (lambda (el) (if (stringp el)
 196                                                       el
 197                                                     (format "%S" el)))))))
 198                     data-file)
 199                 (if (stringp val) val (format "%S" val))))
 200             body)))
 201    vars)
 202   body)
 203
 204 (defun org-babel-prep-session:sql (session params)
 205   "Raise an error because Sql sessions aren't implemented."
 206   (error "SQL sessions not yet implemented"))
 207
 208 (provide 'ob-sql)
 209
 210
 211
 212 ;;; ob-sql.el ends here