Skip dropping/re-adding of constraints and indexes for MySQL #1499

calaccess_raw/management/commands/loadcalaccessrawfile.py

@@ -147,9 +147,6 @@ def load(self):
                     "{} not configured in DATABASES settings.".format(self.database)
                 )
 
-        # temporarily drop model and field constraints and indexes
-        self.model.objects.drop_constraints_and_indexes()
-
         # set up database connection
         self.connection = connections[self.database]
         self.cursor = self.connection.cursor()
@@ -161,16 +158,17 @@ def load(self):
             'django.db.backends.postgresql_psycopg2'
             'django.contrib.gis.db.backends.postgis'
         ):
+            # temporarily drop model and field constraints and indexes
+            self.model.objects.drop_constraints_and_indexes()
             self.load_postgresql()
+            # re-add model and field constraints and indexes
+            self.model.objects.add_constraints_and_indexes()
         else:
             self.failure("Sorry your database engine is unsupported")
             raise CommandError(
                 "Only MySQL and PostgresSQL backends supported."
             )
 
-        # re-add model and field constraints and indexes
-        self.model.objects.add_constraints_and_indexes()
-
     def load_dat(self):
         """
         Takes a model and a csv file and loads it into dat.