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213 lines
7.4 KiB
EmacsLisp
213 lines
7.4 KiB
EmacsLisp
;;; ob-sql.el --- org-babel functions for sql evaluation
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;; Copyright (C) 2009-2013 Free Software Foundation, Inc.
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;; Author: Eric Schulte
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;; Keywords: literate programming, reproducible research
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;; Homepage: http://orgmode.org
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Org-Babel support for evaluating sql source code.
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;; (see also ob-sqlite.el)
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;;
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;; SQL is somewhat unique in that there are many different engines for
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;; the evaluation of sql (Mysql, PostgreSQL, etc...), so much of this
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;; file will have to be implemented engine by engine.
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;;
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;; Also SQL evaluation generally takes place inside of a database.
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;;
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;; Header args used:
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;; - engine
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;; - cmdline
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;; - dbhost
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;; - dbuser
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;; - dbpassword
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;; - database
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;; - colnames (default, nil, means "yes")
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;; - result-params
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;; - out-file
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;; The following are used but not really implemented for SQL:
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;; - colname-names
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;; - rownames
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;; - rowname-names
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;;
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;; TODO:
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;;
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;; - support for sessions
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;; - support for more engines (currently only supports mysql)
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;; - what's a reasonable way to drop table data into SQL?
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;;
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;;; Code:
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(require 'ob)
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(eval-when-compile (require 'cl))
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(declare-function org-table-import "org-table" (file arg))
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(declare-function orgtbl-to-csv "org-table" (table params))
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(declare-function org-table-to-lisp "org-table" (&optional txt))
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(defvar org-babel-default-header-args:sql '())
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(defconst org-babel-header-args:sql
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'((engine . :any)
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(out-file . :any)
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(dbhost . :any)
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(dbuser . :any)
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(dbpassword . :any)
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(database . :any))
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"SQL-specific header arguments.")
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(defun org-babel-expand-body:sql (body params)
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"Expand BODY according to the values of PARAMS."
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(org-babel-sql-expand-vars
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body (mapcar #'cdr (org-babel-get-header params :var))))
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(defun dbstring-mysql (host user password database)
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"Make MySQL cmd line args for database connection. Pass nil to omit that arg."
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(combine-and-quote-strings
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(remq nil
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(list (when host (concat "-h" host))
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(when user (concat "-u" user))
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(when password (concat "-p" password))
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(when database (concat "-D" database))))))
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(defun org-babel-execute:sql (body params)
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"Execute a block of Sql code with Babel.
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This function is called by `org-babel-execute-src-block'."
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(let* ((result-params (cdr (assoc :result-params params)))
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(cmdline (cdr (assoc :cmdline params)))
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(dbhost (cdr (assoc :dbhost params)))
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(dbuser (cdr (assoc :dbuser params)))
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(dbpassword (cdr (assoc :dbpassword params)))
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(database (cdr (assoc :database params)))
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(engine (cdr (assoc :engine params)))
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(colnames-p (not (equal "no" (cdr (assoc :colnames params)))))
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(in-file (org-babel-temp-file "sql-in-"))
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(out-file (or (cdr (assoc :out-file params))
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(org-babel-temp-file "sql-out-")))
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(header-delim "")
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(command (case (intern engine)
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('dbi (format "dbish --batch %s < %s | sed '%s' > %s"
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(or cmdline "")
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(org-babel-process-file-name in-file)
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"/^+/d;s/^\|//;s/(NULL)/ /g;$d"
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(org-babel-process-file-name out-file)))
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('monetdb (format "mclient -f tab %s < %s > %s"
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(or cmdline "")
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(org-babel-process-file-name in-file)
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(org-babel-process-file-name out-file)))
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('msosql (format "osql %s -s \"\t\" -i %s -o %s"
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(or cmdline "")
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(org-babel-process-file-name in-file)
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(org-babel-process-file-name out-file)))
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('mysql (format "mysql %s %s %s < %s > %s"
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(dbstring-mysql dbhost dbuser dbpassword database)
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(if colnames-p "" "-N")
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(or cmdline "")
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(org-babel-process-file-name in-file)
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(org-babel-process-file-name out-file)))
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('postgresql (format
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"psql -A -P footer=off -F \"\t\" -f %s -o %s %s"
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(org-babel-process-file-name in-file)
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(org-babel-process-file-name out-file)
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(or cmdline "")))
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(t (error "No support for the %s SQL engine" engine)))))
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(with-temp-file in-file
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(insert
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(case (intern engine)
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('dbi "/format partbox\n")
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(t ""))
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(org-babel-expand-body:sql body params)))
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(message command)
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(org-babel-eval command "")
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(org-babel-result-cond result-params
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(with-temp-buffer
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(progn (insert-file-contents-literally out-file) (buffer-string)))
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(with-temp-buffer
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(cond
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((or (eq (intern engine) 'mysql)
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(eq (intern engine) 'dbi)
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(eq (intern engine) 'postgresql))
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;; Add header row delimiter after column-names header in first line
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(cond
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(colnames-p
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(with-temp-buffer
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(insert-file-contents out-file)
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(goto-char (point-min))
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(forward-line 1)
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(insert "-\n")
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(setq header-delim "-")
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(write-file out-file)))))
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(t
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;; Need to figure out the delimiter for the header row
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(with-temp-buffer
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(insert-file-contents out-file)
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(goto-char (point-min))
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(when (re-search-forward "^\\(-+\\)[^-]" nil t)
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(setq header-delim (match-string-no-properties 1)))
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(goto-char (point-max))
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(forward-char -1)
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(while (looking-at "\n")
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(delete-char 1)
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(goto-char (point-max))
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(forward-char -1))
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(write-file out-file))))
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(org-table-import out-file '(16))
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(org-babel-reassemble-table
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(mapcar (lambda (x)
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(if (string= (car x) header-delim)
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'hline
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x))
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(org-table-to-lisp))
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(org-babel-pick-name (cdr (assoc :colname-names params))
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(cdr (assoc :colnames params)))
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(org-babel-pick-name (cdr (assoc :rowname-names params))
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(cdr (assoc :rownames params))))))))
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(defun org-babel-sql-expand-vars (body vars)
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"Expand the variables held in VARS in BODY."
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(mapc
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(lambda (pair)
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(setq body
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(replace-regexp-in-string
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(format "\$%s" (car pair)) ;FIXME: "\$" == "$"!
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(let ((val (cdr pair)))
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(if (listp val)
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(let ((data-file (org-babel-temp-file "sql-data-")))
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(with-temp-file data-file
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(insert (orgtbl-to-csv
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val '(:fmt (lambda (el) (if (stringp el)
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el
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(format "%S" el)))))))
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data-file)
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(if (stringp val) val (format "%S" val))))
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body)))
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vars)
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body)
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(defun org-babel-prep-session:sql (session params)
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"Raise an error because Sql sessions aren't implemented."
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(error "SQL sessions not yet implemented"))
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(provide 'ob-sql)
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;;; ob-sql.el ends here
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