invenio_2013_03_07_crcILLREQUEST_overdue_letter.py
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	# -- coding: utf-8 --
	##
	## This file is part of Invenio.
	## Copyright (C) 2012 CERN.
	##
	## Invenio 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 2 of the
	## License, or (at your option) any later version.
	##
	## Invenio 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 Invenio; if not, write to the Free Software Foundation, Inc.,
	## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

	import warnings
	from invenio.dbquery import run_sql
	from invenio.utils.text import wait_for_user

	depends_on = ['invenio_release_1_1_0']

	def info():
	return "New crcILLREQUEST overdue letter columns"

	def do_upgrade():
	stmt = run_sql('SHOW CREATE TABLE crcILLREQUEST')[0][1]
	if '`overdue_letter_number` int(3)' not in stmt:
	run_sql("ALTER TABLE crcILLREQUEST ADD COLUMN overdue_letter_number int(3) unsigned NOT NULL default '0'")
	if '`overdue_letter_date` datetime' not in stmt:
	run_sql("ALTER TABLE crcILLREQUEST ADD COLUMN overdue_letter_date datetime NOT NULL default '0000-00-00 00:00:00'")


	def estimate():
	return 1

	def pre_upgrade():
	pass

	def post_upgrade():
	pass