lisp/ob-sql.el

   1 ;;; ob-sql.el --- org-babel functions for sql evaluation
   2
   3 ;; Copyright (C) 2009-2014 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 ;; - dbport
  40 ;; - dbuser
  41 ;; - dbpassword
  42 ;; - database
  43 ;; - colnames (default, nil, means "yes")
  44 ;; - result-params
  45 ;; - out-file
  46 ;; The following are used but not really implemented for SQL:
  47 ;; - colname-names
  48 ;; - rownames
  49 ;; - rowname-names
  50 ;;
  51 ;; TODO:
  52 ;;
  53 ;; - support for sessions
  54 ;; - support for more engines (currently only supports mysql)
  55 ;; - what's a reasonable way to drop table data into SQL?
  56 ;;
  57
  58 ;;; Code:
  59 (require 'ob)
  60 (eval-when-compile (require 'cl))
  61
  62 (declare-function org-table-import "org-table" (file arg))
  63 (declare-function orgtbl-to-csv "org-table" (table params))
  64 (declare-function org-table-to-lisp "org-table" (&optional txt))
  65
  66 (defvar org-babel-default-header-args:sql '())
  67
  68 (defconst org-babel-header-args:sql
  69   '((engine            . :any)
  70     (out-file          . :any)
  71     (dbhost            . :any)
  72     (dbport            . :any)
  73     (dbuser            . :any)
  74     (dbpassword        . :any)
  75     (database          . :any))
  76   "SQL-specific header arguments.")
  77
  78 (defun org-babel-expand-body:sql (body params)
  79   "Expand BODY according to the values of PARAMS."
  80   (org-babel-sql-expand-vars
  81    body (mapcar #'cdr (org-babel-get-header params :var))))
  82
  83 (defun org-babel-sql-dbstring-mysql (host port user password database)
  84   "Make MySQL cmd line args for database connection.  Pass nil to omit that arg."
  85   (combine-and-quote-strings
  86    (delq nil
  87          (list (when host     (concat "-h" host))
  88                (when port     (format "-P%d" port))
  89                (when user     (concat "-u" user))
  90                (when password (concat "-p" password))
  91                (when database (concat "-D" database))))))
  92
  93 (defun org-babel-sql-dbstring-postgresql (host user database)
  94   "Make PostgreSQL command line args for database connection.
  95 Pass nil to omit that arg."
  96   (combine-and-quote-strings
  97    (delq nil
  98          (list (when host (concat "-h" host))
  99                (when user (concat "-U" user))
 100                (when database (concat "-d" database))))))
 101
 102 (defun org-babel-execute:sql (body params)
 103   "Execute a block of Sql code with Babel.
 104 This function is called by `org-babel-execute-src-block'."
 105   (let* ((result-params (cdr (assoc :result-params params)))
 106          (cmdline (cdr (assoc :cmdline params)))
 107          (dbhost (cdr (assoc :dbhost params)))
 108          (dbport (cdr (assq :dbport params)))
 109          (dbuser (cdr (assoc :dbuser params)))
 110          (dbpassword (cdr (assoc :dbpassword params)))
 111          (database (cdr (assoc :database params)))
 112          (engine (cdr (assoc :engine params)))
 113          (colnames-p (not (equal "no" (cdr (assoc :colnames params)))))
 114          (in-file (org-babel-temp-file "sql-in-"))
 115          (out-file (or (cdr (assoc :out-file params))
 116                        (org-babel-temp-file "sql-out-")))
 117          (header-delim "")
 118          (command (case (intern engine)
 119                     ('dbi (format "dbish --batch %s < %s | sed '%s' > %s"
 120                                   (or cmdline "")
 121                                   (org-babel-process-file-name in-file)
 122                                   "/^+/d;s/^\|//;s/(NULL)/ /g;$d"
 123                                   (org-babel-process-file-name out-file)))
 124                     ('monetdb (format "mclient -f tab %s < %s > %s"
 125                                       (or cmdline "")
 126                                       (org-babel-process-file-name in-file)
 127                                       (org-babel-process-file-name out-file)))
 128                     ('msosql (format "osql %s -s \"\t\" -i %s -o %s"
 129                                      (or cmdline "")
 130                                      (org-babel-process-file-name in-file)
 131                                      (org-babel-process-file-name out-file)))
 132                     ('mysql (format "mysql %s %s %s < %s > %s"
 133                                     (org-babel-sql-dbstring-mysql
 134                                      dbhost dbport dbuser dbpassword database)
 135                                     (if colnames-p "" "-N")
 136                                     (or cmdline "")
 137                                     (org-babel-process-file-name in-file)
 138                                     (org-babel-process-file-name out-file)))
 139                     ('postgresql (format
 140                                   "psql --set=\"ON_ERROR_STOP=1\" %s -A -P footer=off -F \"\t\"  %s -f %s -o %s %s"
 141                                   (if colnames-p "" "-t")
 142                                   (org-babel-sql-dbstring-postgresql dbhost dbuser database)
 143                                   (org-babel-process-file-name in-file)
 144                                   (org-babel-process-file-name out-file)
 145                                   (or cmdline "")))
 146                     (t (error "No support for the %s SQL engine" engine)))))
 147     (with-temp-file in-file
 148       (insert
 149        (case (intern engine)
 150          ('dbi "/format partbox\n")
 151          (t ""))
 152        (org-babel-expand-body:sql body params)))
 153     (message command)
 154     (org-babel-eval command "")
 155     (org-babel-result-cond result-params
 156       (with-temp-buffer
 157           (progn (insert-file-contents-literally out-file) (buffer-string)))
 158       (with-temp-buffer
 159         (cond
 160           ((or (eq (intern engine) 'mysql)
 161                (eq (intern engine) 'dbi)
 162                (eq (intern engine) 'postgresql))
 163            ;; Add header row delimiter after column-names header in first line
 164            (cond
 165             (colnames-p
 166              (with-temp-buffer
 167                (insert-file-contents out-file)
 168                (goto-char (point-min))
 169                (forward-line 1)
 170                (insert "-\n")
 171                (setq header-delim "-")
 172                (write-file out-file)))))
 173           (t
 174            ;; Need to figure out the delimiter for the header row
 175            (with-temp-buffer
 176              (insert-file-contents out-file)
 177              (goto-char (point-min))
 178              (when (re-search-forward "^\\(-+\\)[^-]" nil t)
 179                (setq header-delim (match-string-no-properties 1)))
 180              (goto-char (point-max))
 181              (forward-char -1)
 182              (while (looking-at "\n")
 183                (delete-char 1)
 184                (goto-char (point-max))
 185                (forward-char -1))
 186              (write-file out-file))))
 187         (org-table-import out-file '(16))
 188         (org-babel-reassemble-table
 189          (mapcar (lambda (x)
 190                    (if (string= (car x) header-delim)
 191                        'hline
 192                      x))
 193                  (org-table-to-lisp))
 194          (org-babel-pick-name (cdr (assoc :colname-names params))
 195                               (cdr (assoc :colnames params)))
 196          (org-babel-pick-name (cdr (assoc :rowname-names params))
 197                               (cdr (assoc :rownames params))))))))
 198
 199 (defun org-babel-sql-expand-vars (body vars)
 200   "Expand the variables held in VARS in BODY."
 201   (mapc
 202    (lambda (pair)
 203      (setq body
 204            (replace-regexp-in-string
 205             (format "\$%s" (car pair))  ;FIXME: "\$" == "$"!
 206             (let ((val (cdr pair)))
 207               (if (listp val)
 208                   (let ((data-file (org-babel-temp-file "sql-data-")))
 209                     (with-temp-file data-file
 210                       (insert (orgtbl-to-csv
 211                                val '(:fmt (lambda (el) (if (stringp el)
 212                                                       el
 213                                                     (format "%S" el)))))))
 214                     data-file)
 215                 (if (stringp val) val (format "%S" val))))
 216             body)))
 217    vars)
 218   body)
 219
 220 (defun org-babel-prep-session:sql (session params)
 221   "Raise an error because Sql sessions aren't implemented."
 222   (error "SQL sessions not yet implemented"))
 223
 224 (provide 'ob-sql)
 225
 226
 227
 228 ;;; ob-sql.el ends here