class_docstr: This handler handles connection and execution of the DuckDB statements.
docstr: Close the database connection.
docstr_tok: ["Close","the","database","connection","."]
code: def disconnect(self):
      """Close the database connection."""
  
      if self.is_connected is False:
          return
  
      self.connection.close()
      self.is_connected = False
  
imports: from collections import OrderedDict
  import duckdb
  import pandas
  from duckdb import DuckDBPyConnection
  from mindsdb_sql import parse_sql
  from mindsdb_sql.parser.ast.base import ASTNode
  from mindsdb_sql.render.sqlalchemy_render import SqlalchemyRender
  from mindsdb.integrations.libs.base import DatabaseHandler
  from mindsdb.integrations.libs.const import HANDLER_CONNECTION_ARG_TYPE
  from mindsdb.integrations.libs.response import RESPONSE_TYPE
  from mindsdb.integrations.libs.response import HandlerResponse
  from mindsdb.integrations.libs.response import HandlerStatusResponse
  from mindsdb.utilities import log
label_desc: Use image node_id 4 for calling the DuckDBHandler obj's underlying member method code with example usage: obj.disconnect() without return types