<commit_before>import datetime

from django.db.utils import DatabaseError

try:
    from django.utils.six.moves import _thread as thread
except ImportError:
    from django.utils.six.moves import _dummy_thread as thread
from collections import namedtuple
from contextlib import contextmanager

from django.conf import settings
from django.db import DEFAULT_DB_ALIAS
from django.db.backends.signals import connection_created
from django.db.backends import util
from django.db.transaction import TransactionManagementError
from django.utils.functional import cached_property
from django.utils.importlib import import_module
from django.utils import six
from django.utils import timezone


class BaseDatabaseWrapper(object):
    """
    Represents a database connection.
    """
    ops = None
    vendor = 'unknown'

    def __init__(self, settings_dict, alias=DEFAULT_DB_ALIAS,
                 allow_thread_sharing=False):
        # `settings_dict` should be a dictionary containing keys such as
        # NAME, USER, etc. It's called `settings_dict` instead of `settings`
        # to disambiguate it from Django settings modules.
        self.connection = None
        self.queries = []
        self.settings_dict = settings_dict
        self.alias = alias
        self.use_debug_cursor = None

        # Transaction related attributes
        self.transaction_state = []
        self.savepoint_state = 0
        self._dirty = None
        self._thread_ident = thread.get_ident()
        self.allow_thread_sharing = allow_thread_sharing

    def __eq__(self, other):
        return self.alias == other.alias

    def __ne__(self, other):
        return not self == other

    __hash__ = object.__hash__

    def _cursor(self):
        if self.connection is None:
            conn_params = self.get_connection_params()
            self.connection = self.get_new_connection(conn_params)
            self.init_connection_state()
            connection_created.send(sender=self.__class__, connection=self)
        return self.create_cursor()

    def _commit(self):
        if self.connection is not None:
            return self.connection.commit()

    def _rollback(self):
        if self.connection is not None:
            return self.connection.rollback()

    def _enter_transaction_management(self, managed):
        """
        A hook for backend-specific changes required when entering manual
        transaction handling.
        """
        pass<commit_msg>Added required methods in BaseDatabaseWrapper.<commit_after>import datetime

from django.db.utils import DatabaseError

try:
    from django.utils.six.moves import _thread as thread
except ImportError:
    from django.utils.six.moves import _dummy_thread as thread
from collections import namedtuple
from contextlib import contextmanager

from django.conf import settings
from django.db import DEFAULT_DB_ALIAS
from django.db.backends.signals import connection_created
from django.db.backends import util
from django.db.transaction import TransactionManagementError
from django.utils.functional import cached_property
from django.utils.importlib import import_module
from django.utils import six
from django.utils import timezone


class BaseDatabaseWrapper(object):
    """
    Represents a database connection.
    """
    ops = None
    vendor = 'unknown'

    def __init__(self, settings_dict, alias=DEFAULT_DB_ALIAS,
                 allow_thread_sharing=False):
        # `settings_dict` should be a dictionary containing keys such as
        # NAME, USER, etc. It's called `settings_dict` instead of `settings`
        # to disambiguate it from Django settings modules.
        self.connection = None
        self.queries = []
        self.settings_dict = settings_dict
        self.alias = alias
        self.use_debug_cursor = None

        # Transaction related attributes
        self.transaction_state = []
        self.savepoint_state = 0
        self._dirty = None
        self._thread_ident = thread.get_ident()
        self.allow_thread_sharing = allow_thread_sharing

    def __eq__(self, other):
        return self.alias == other.alias

    def __ne__(self, other):
        return not self == other

    __hash__ = object.__hash__

    def get_connection_params(self):
        raise NotImplementedError

    def get_new_connection(self, conn_params):
        raise NotImplementedError

    def init_connection_state(self):
        raise NotImplementedError

    def create_cursor(self):
        raise NotImplementedError

    def _cursor(self):
        if self.connection is None:
            conn_params = self.get_connection_params()
            self.connection = self.get_new_connection(conn_params)
            self.init_connection_state()
            connection_created.send(sender=self.__class__, connection=self)
        return self.create_cursor()

    def _commit(self):
        if self.connection is not None:
            return self.connection.commit()

    def _rollback(self):
        if self.connection is not None:
            return self.connection.rollback()

    def _enter_transaction_management(self, managed):
        """
        A hook for backend-specific changes required when entering manual
        transaction handling.
        """
        pass
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