invenio_2013_08_22_hstRECORD_affected_fields.py
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	# -- coding: utf-8 --
	##
	## This file is part of Invenio.
	## Copyright (C) 2012, 2013 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.

	from invenio.dbquery import run_sql

	depends_on = ['invenio_2012_11_15_hstRECORD_marcxml_longblob']

	def info():
	return "New column hstRECORD.affected_fields"

	def do_upgrade():
	#first step: change the table
	create_statement = run_sql('SHOW CREATE TABLE hstRECORD')[0][1]
	if 'affected_fields' not in create_statement:
	run_sql("ALTER TABLE hstRECORD ADD COLUMN affected_fields text NOT NULL default '' AFTER job_details")
	#second step: nothing
	#we don't need to fill in the column since empty value
	#is valid and it means that all fields/tags were modified

	def estimate():
	""" Estimate running time of upgrade in seconds (optional). """
	return 1

	def pre_upgrade():
	pass

	def post_upgrade():
	"""Check for potentially invalid revisions"""