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# -*- coding: utf-8 -*-
"""
originally from http://www.djangosnippets.org/snippets/828/ by dnordberg
"""
import logging
import django
from django.conf import settings
from django.core.management.base import BaseCommand, CommandError
from six.moves import input
from django_extensions.management.mysql import parse_mysql_cnf
from django_extensions.management.utils import signalcommand
class Command(BaseCommand):
help = "Resets the database for this project."
def add_arguments(self, parser):
super(Command, self).add_arguments(parser)
parser.add_argument(
'--noinput', action='store_false',
dest='interactive', default=True,
help='Tells Django to NOT prompt the user for input of any kind.')
parser.add_argument(
'--no-utf8', action='store_true', dest='no_utf8_support',
default=False,
help='Tells Django to not create a UTF-8 charset database')
parser.add_argument(
'-U', '--user', action='store', dest='user', default=None,
help='Use another user for the database then defined in '
'settings.py')
parser.add_argument(
'-O', '--owner', action='store', dest='owner', default=None,
help='Use another owner for creating the database then the '
'user defined in settings or via --user')
parser.add_argument(
'-P', '--password', action='store', dest='password', default=None,
help='Use another password for the database then defined in '
'settings.py')
parser.add_argument(
'-D', '--dbname', action='store', dest='dbname', default=None,
help='Use another database name then defined in settings.py')
parser.add_argument(
'-R', '--router', action='store', dest='router', default='default',
help='Use this router-database other then defined in settings.py')
parser.add_argument(
'-c', '--close-sessions', action='store_true', dest='close_sessions', default=False,
help='Close database connections before dropping database (PostgreSQL only)')
@signalcommand
def handle(self, *args, **options):
"""
Resets the database for this project.
Note: Transaction wrappers are in reverse as a work around for
autocommit, anybody know how to do this the right way?
"""
if args:
raise CommandError("reset_db takes no arguments")
router = options.get('router')
dbinfo = settings.DATABASES.get(router)
if dbinfo is None:
raise CommandError("Unknown database router %s" % router)
engine = dbinfo.get('ENGINE').split('.')[-1]
user = password = database_name = database_host = database_port = ''
if engine == 'mysql':
(user, password, database_name, database_host, database_port) = parse_mysql_cnf(dbinfo)
user = options.get('user') or dbinfo.get('USER') or user
password = options.get('password') or dbinfo.get('PASSWORD') or password
owner = options.get('owner') or user
database_name = options.get('dbname') or dbinfo.get('NAME') or database_name
if database_name == '':
raise CommandError("You need to specify DATABASE_NAME in your Django settings file.")
database_host = dbinfo.get('HOST') or database_host
database_port = dbinfo.get('PORT') or database_port
verbosity = int(options.get('verbosity', 1))
if options.get('interactive'):
confirm = input("""
You have requested a database reset.
This will IRREVERSIBLY DESTROY
ALL data in the database "%s".
Are you sure you want to do this?
Type 'yes' to continue, or 'no' to cancel: """ % (database_name,))
else:
confirm = 'yes'
if confirm != 'yes':
print("Reset cancelled.")
return
if engine in ('sqlite3', 'spatialite'):
import os
try:
logging.info("Unlinking %s database" % engine)
os.unlink(database_name)
except OSError:
pass
elif engine in ('mysql',):
import MySQLdb as Database
kwargs = {
'user': user,
'passwd': password,
}
if database_host.startswith('/'):
kwargs['unix_socket'] = database_host
else:
kwargs['host'] = database_host
if database_port:
kwargs['port'] = int(database_port)
connection = Database.connect(**kwargs)
drop_query = 'DROP DATABASE IF EXISTS `%s`' % database_name
utf8_support = options.get('no_utf8_support', False) and '' or 'CHARACTER SET utf8'
create_query = 'CREATE DATABASE `%s` %s' % (database_name, utf8_support)
logging.info('Executing... "' + drop_query + '"')
connection.query(drop_query)
logging.info('Executing... "' + create_query + '"')
connection.query(create_query)
elif engine in ('postgresql', 'postgresql_psycopg2', 'postgis'):
if engine == 'postgresql' and django.VERSION < (1, 9):
import psycopg as Database # NOQA
elif engine in ('postgresql', 'postgresql_psycopg2', 'postgis'):
import psycopg2 as Database # NOQA
conn_params = {'database': 'template1'}
if user:
conn_params['user'] = user
if password:
conn_params['password'] = password
if database_host:
conn_params['host'] = database_host
if database_port:
conn_params['port'] = database_port
connection = Database.connect(**conn_params)
connection.set_isolation_level(0) # autocommit false
cursor = connection.cursor()
if options.get('close_sessions'):
close_sessions_query = """
SELECT pg_terminate_backend(pg_stat_activity.pid)
FROM pg_stat_activity
WHERE pg_stat_activity.datname = '%s';
""" % database_name
logging.info('Executing... "' + close_sessions_query.strip() + '"')
try:
cursor.execute(close_sessions_query)
except Database.ProgrammingError as e:
logging.exception("Error: %s" % str(e))
drop_query = "DROP DATABASE \"%s\";" % database_name
logging.info('Executing... "' + drop_query + '"')
try:
cursor.execute(drop_query)
except Database.ProgrammingError as e:
logging.exception("Error: %s" % str(e))
create_query = "CREATE DATABASE \"%s\"" % database_name
if owner:
create_query += " WITH OWNER = \"%s\" " % owner
create_query += " ENCODING = 'UTF8'"
if engine == 'postgis' and django.VERSION < (1, 9):
# For PostGIS 1.5, fetch template name if it exists
from django.contrib.gis.db.backends.postgis.base import DatabaseWrapper
postgis_template = DatabaseWrapper(dbinfo).template_postgis
if postgis_template is not None:
create_query += ' TEMPLATE = %s' % postgis_template
if settings.DEFAULT_TABLESPACE:
create_query += ' TABLESPACE = %s;' % settings.DEFAULT_TABLESPACE
else:
create_query += ';'
logging.info('Executing... "' + create_query + '"')
cursor.execute(create_query)
else:
raise CommandError("Unknown database engine %s" % engine)
if verbosity >= 2 or options.get('interactive'):
print("Reset successful.")
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