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R3600/modules/miscutil/lib/upgrades/invenio_2013_10_11_bibHOLDINGPEN_longblob.py
595c3a043b1amaint-2.0

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invenio_2013_10_11_bibHOLDINGPEN_longblob.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 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.
import warnings
import zlib
from invenio.dbquery import run_sql
depends_on = ['invenio_release_1_1_0']
def info():
return "Change bibHOLDINGPEN.changeset_xml storage to longblob"
def do_upgrade():
create_statement = run_sql('SHOW CREATE TABLE bibHOLDINGPEN')[0][1]
if '`changeset_xml` longblob' not in create_statement:
# First do a backup of the table
run_sql("""CREATE TABLE IF NOT EXISTS bibHOLDINGPEN_backup SELECT * FROM bibHOLDINGPEN""")
# And alter it
run_sql("ALTER TABLE bibHOLDINGPEN CHANGE changeset_xml changeset_xml longblob NOT NULL")
# Compress all the record xml content
for row in run_sql("""SELECT * FROM bibHOLDINGPEN"""):
try:
record_xml = row[2]
zlib.decompress(record_xml)
except zlib.error:
run_sql("UPDATE bibHOLDINGPEN SET changeset_xml=%s WHERE changeset_id=%s", (zlib.compress(record_xml), row[0]))
warnings.warn("A backup table bibHOLDINGPEN_backup was created in the process. It can be deleted now.")
def estimate():
""" Estimate running time of upgrade in seconds (optional). """
count_rows = run_sql("SELECT COUNT(*) FROM bibHOLDINGPEN")[0][0]
return count_rows / 20
def pre_upgrade():
"""Check for potentially invalid revisions"""
res = run_sql("""SELECT DISTINCT(changeset_id) FROM bibHOLDINGPEN
WHERE LENGTH(changeset_xml) = %s""", [2**16-1])
if res:
warnings.warn("""You have %s holding pen entries with potentially corrupt data!
You can find the rows affected with the sql command:
SELECT DISTINCT(changeset_id) FROM bibHOLDINGPEN
WHERE LENGTH(changeset_xml) = 65535""" % len(res))
from invenio.textutils import wait_for_user
try:
wait_for_user("\nThis upgrade will delete all the corrupted entries. A backup table bibHOLDINGPEN_backup will be created.\n")
except SystemExit:
raise RuntimeError("Upgrade aborted by user.")
for r in res:
run_sql("""DELETE FROM bibHOLDINGPEN WHERE changeset_id=%s""" % r[0])
def post_upgrade():
pass
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