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"""GNUmed database pruning DML generator.
This script generates DML for pruning database tables
before restoring backups.
Theory of operation:
The script reads a plaintext format database backup of the
--data-only variety as generated by pg_dump and creates the
appropriate DML commands to prune the tables which are
inserted into by the backup.
It is useful to pre-process the dump with:
cut -f -5 -d " " data-only-dump.sql | grep -E "^(SET)|(INSERT)"
to weed out superfluous cruft.
"""
#==================================================================
# $Source: /home/ncq/Projekte/cvs2git/vcs-mirror/gnumed/gnumed/server/bootstrap/gmDBPruningDMLGenerator.py,v $
__version__ = "$Revision: 1.3 $"
__author__ = "Karsten.Hilbert@gmx.net"
__license__ = "GPL v2 or later (details at http://www.gnu.org)"
import sys, os.path, codecs, logging
_log = logging.getLogger('gm.bootstrapper')
_log.info(__version__)
#==================================================================
def generate_pruning_dml(filename=None):
# FIXME: encoding may need configuration
backup_file = codecs.open(filename = filename, mode = 'rU', encoding = 'utf8')
backup_path, name = os.path.split(filename)
name, ext = os.path.splitext(name)
dml_name = os.path.join(backup_path, '%s-prune_tables.sql' % name)
dml_file = codecs.open(filename = dml_name, mode = 'w', encoding = 'utf8')
prev_table = None
idx = 1
for line in backup_file:
print idx
idx += 1
# reproduce configuration
if line.startswith('SET '):
dml_file.write(line)
# detect tables to prune
if line.startswith('INSERT INTO '):
table = line.split()[2]
# skip duplicates
if prev_table == table:
continue
prev_table = table
dml_file.write('delete from %s;\n' % table)
dml_file.close()
backup_file.close()
#==================================================================
# main
#------------------------------------------------------------------
if __name__ == "__main__" :
generate_pruning_dml(sys.argv[1])
#==================================================================
# $Log: gmDBPruningDMLGenerator.py,v $
# Revision 1.3 2009-04-24 12:12:33 ncq
# - typo
#
# Revision 1.2 2008/01/07 14:15:43 ncq
# - port to gmCfg2/gmLog2
# - create database with default transaction mode set to readonly
#
# Revision 1.1 2007/11/04 01:28:07 ncq
# - first version
#
#
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