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;;; ob-sql.el --- org-babel functions for sql evaluation
;; Copyright (C) 2009-2015 Free Software Foundation, Inc.
;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage: http://orgmode.org
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Org-Babel support for evaluating sql source code.
;; (see also ob-sqlite.el)
;;
;; SQL is somewhat unique in that there are many different engines for
;; the evaluation of sql (Mysql, PostgreSQL, etc...), so much of this
;; file will have to be implemented engine by engine.
;;
;; Also SQL evaluation generally takes place inside of a database.
;;
;; Header args used:
;; - engine
;; - cmdline
;; - dbhost
;; - dbuser
;; - dbpassword
;; - database
;; - colnames (default, nil, means "yes")
;; - result-params
;; - out-file
;; The following are used but not really implemented for SQL:
;; - colname-names
;; - rownames
;; - rowname-names
;;
;; TODO:
;;
;; - support for sessions
;; - support for more engines (currently only supports mysql)
;; - what's a reasonable way to drop table data into SQL?
;;
;;; Code:
(require 'ob)
(eval-when-compile (require 'cl))
(declare-function org-table-import "org-table" (file arg))
(declare-function orgtbl-to-csv "org-table" (table params))
(declare-function org-table-to-lisp "org-table" (&optional txt))
(defvar org-babel-default-header-args:sql '())
(defconst org-babel-header-args:sql
'((engine . :any)
(out-file . :any)
(dbhost . :any)
(dbuser . :any)
(dbpassword . :any)
(database . :any))
"SQL-specific header arguments.")
(defun org-babel-expand-body:sql (body params)
"Expand BODY according to the values of PARAMS."
(org-babel-sql-expand-vars
body (mapcar #'cdr (org-babel-get-header params :var))))
(defun dbstring-mysql (host user password database)
"Make MySQL cmd line args for database connection. Pass nil to omit that arg."
(combine-and-quote-strings
(remq nil
(list (when host (concat "-h" host))
(when user (concat "-u" user))
(when password (concat "-p" password))
(when database (concat "-D" database))))))
(defun org-babel-execute:sql (body params)
"Execute a block of Sql code with Babel.
This function is called by `org-babel-execute-src-block'."
(let* ((result-params (cdr (assoc :result-params params)))
(cmdline (cdr (assoc :cmdline params)))
(dbhost (cdr (assoc :dbhost params)))
(dbuser (cdr (assoc :dbuser params)))
(dbpassword (cdr (assoc :dbpassword params)))
(database (cdr (assoc :database params)))
(engine (cdr (assoc :engine params)))
(colnames-p (not (equal "no" (cdr (assoc :colnames params)))))
(in-file (org-babel-temp-file "sql-in-"))
(out-file (or (cdr (assoc :out-file params))
(org-babel-temp-file "sql-out-")))
(header-delim "")
(command (case (intern engine)
('dbi (format "dbish --batch %s < %s | sed '%s' > %s"
(or cmdline "")
(org-babel-process-file-name in-file)
"/^+/d;s/^\|//;s/(NULL)/ /g;$d"
(org-babel-process-file-name out-file)))
('monetdb (format "mclient -f tab %s < %s > %s"
(or cmdline "")
(org-babel-process-file-name in-file)
(org-babel-process-file-name out-file)))
('msosql (format "osql %s -s \"\t\" -i %s -o %s"
(or cmdline "")
(org-babel-process-file-name in-file)
(org-babel-process-file-name out-file)))
('mysql (format "mysql %s %s %s < %s > %s"
(dbstring-mysql dbhost dbuser dbpassword database)
(if colnames-p "" "-N")
(or cmdline "")
(org-babel-process-file-name in-file)
(org-babel-process-file-name out-file)))
('postgresql (format
"psql -A -P footer=off -F \"\t\" -f %s -o %s %s"
(org-babel-process-file-name in-file)
(org-babel-process-file-name out-file)
(or cmdline "")))
(t (error "No support for the %s SQL engine" engine)))))
(with-temp-file in-file
(insert
(case (intern engine)
('dbi "/format partbox\n")
(t ""))
(org-babel-expand-body:sql body params)))
(message command)
(org-babel-eval command "")
(org-babel-result-cond result-params
(with-temp-buffer
(progn (insert-file-contents-literally out-file) (buffer-string)))
(with-temp-buffer
(cond
((or (eq (intern engine) 'mysql)
(eq (intern engine) 'dbi)
(eq (intern engine) 'postgresql))
;; Add header row delimiter after column-names header in first line
(cond
(colnames-p
(with-temp-buffer
(insert-file-contents out-file)
(goto-char (point-min))
(forward-line 1)
(insert "-\n")
(setq header-delim "-")
(write-file out-file)))))
(t
;; Need to figure out the delimiter for the header row
(with-temp-buffer
(insert-file-contents out-file)
(goto-char (point-min))
(when (re-search-forward "^\\(-+\\)[^-]" nil t)
(setq header-delim (match-string-no-properties 1)))
(goto-char (point-max))
(forward-char -1)
(while (looking-at "\n")
(delete-char 1)
(goto-char (point-max))
(forward-char -1))
(write-file out-file))))
(org-table-import out-file '(16))
(org-babel-reassemble-table
(mapcar (lambda (x)
(if (string= (car x) header-delim)
'hline
x))
(org-table-to-lisp))
(org-babel-pick-name (cdr (assoc :colname-names params))
(cdr (assoc :colnames params)))
(org-babel-pick-name (cdr (assoc :rowname-names params))
(cdr (assoc :rownames params))))))))
(defun org-babel-sql-expand-vars (body vars)
"Expand the variables held in VARS in BODY."
(mapc
(lambda (pair)
(setq body
(replace-regexp-in-string
(format "\$%s" (car pair)) ;FIXME: "\$" == "$"!
(let ((val (cdr pair)))
(if (listp val)
(let ((data-file (org-babel-temp-file "sql-data-")))
(with-temp-file data-file
(insert (orgtbl-to-csv
val '(:fmt (lambda (el) (if (stringp el)
el
(format "%S" el)))))))
data-file)
(if (stringp val) val (format "%S" val))))
body)))
vars)
body)
(defun org-babel-prep-session:sql (session params)
"Raise an error because Sql sessions aren't implemented."
(error "SQL sessions not yet implemented"))
(provide 'ob-sql)
;;; ob-sql.el ends here
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