Use match when doing copies to db

[GeoWill]

specifically here:

UK-Polling-Stations/polling_stations/apps/addressbase/management/commands/update_addressbase.py

Lines 31 to 58 in 31f62e6

	class AddressbaseUpdater(BaseImporter):
	def get_table_name(self):
	return "addressbase_address"
	def import_data_to_temp_table(self):
	copy_string = f"""
	COPY {self.temp_table_name} (UPRN, address, postcode, location, addressbase_postal)
	FROM STDIN
	WITH (FORMAT CSV, DELIMITER ',', QUOTE '"');
	"""
	self.stdout.write(f"Executing: {copy_string}")
	with open(self.data_path) as f:
	self.cursor.copy_expert(copy_string, f)
	class UprnToCouncilUpdater(BaseImporter):
	def get_table_name(self):
	return "addressbase_uprntocouncil"
	def import_data_to_temp_table(self):
	copy_string = f"""
	COPY {self.temp_table_name} (uprn, lad, polling_station_id, advance_voting_station_id)
	FROM STDIN
	WITH (FORMAT CSV, DELIMITER ',', null '\\N');
	"""
	self.stdout.write(f"Executing: {copy_string}")
	with open(self.data_path) as f:
	self.cursor.copy_expert(copy_string, f)

Ref https://github.com/DemocracyClub/uk-geo-utils/pull/33/files#r1836749158