class_docstr: View for presenting your own forms
  Inherit from this view to provide some base
  processing for your customized form views.
  
  Notice that this class inherits from BaseView
  so all properties from the parent class can be overridden also.
  
  Implement form_get and form_post to implement
  your form pre-processing and post-processing
code: def this_form_post(self) -> Any:
      self._init_vars()
      form = self.form.refresh()
      if form.validate_on_submit():
          response = self.form_post(
              form
          )  # pylint: disable=assignment-from-no-return
          if not response:
              return redirect(self.get_redirect())
          return response
      return self.render_template(
          self.form_template,
          title=self.form_title,
          form=form,
          appbuilder=self.appbuilder,
      )
  
imports: import io
  import json
  import os
  import tempfile
  import zipfile
  from typing import Any, TYPE_CHECKING
  import pandas
  from flask import flash, g, redirect
  from flask_appbuilder import expose, SimpleFormView
  from flask_appbuilder.models.sqla.interface import SQLAInterface
  from flask_appbuilder.security.decorators import has_access
  from flask_babel import lazy_gettext
  from werkzeug.wrappers import Response
  from wtforms.fields import StringField
  from wtforms.validators import ValidationError
  import superset.models.core
  from superset import app, db
  from superset.connectors.sqla.models import SqlaTable
  from superset.constants import MODEL_VIEW_RW_METHOD_PERMISSION_MAP, RouteMethod
  from superset.exceptions import CertificateException
  from superset.extensions import event_logger
  from superset.sql_parse import Table
  from superset.superset_typing import FlaskResponse
  from superset.utils import core
  from superset.views.base import DeleteMixin, SupersetModelView, YamlExportMixin
  from .forms import ColumnarToDatabaseForm, CsvToDatabaseForm, ExcelToDatabaseForm
  from .mixins import DatabaseMixin
  from .validators import schema_allows_file_upload, sqlalchemy_uri_validator
label_desc: Use image node_id 2 for calling the CustomFormView obj's underlying member method code with example usage: obj.this_form_post() and returns: self, response, redirect