class_docstr: This handler handles connection and execution of the PostgreSQL statements.
docstr: Handles the connection to a PostgreSQL database instance.
docstr_tok: ["Handles","the","connection","to","a","PostgreSQL","database","instance","."]
code: def connect(self):
      """
      Handles the connection to a PostgreSQL database instance.
      """
      if self.is_connected is True:
          return self.connection
  
      config = {
          "host": self.connection_args.get("host"),
          "port": self.connection_args.get("port"),
          "user": self.connection_args.get("user"),
          "password": self.connection_args.get("password"),
          "dbname": self.connection_args.get("database"),
      }
  
      if self.connection_args.get("sslmode"):
          config["sslmode"] = self.connection_args.get("sslmode")
  
      if self.connection_args.get("schema"):
          config[
              "options"
          ] = f'-c search_path={self.connection_args.get("schema")},public'
  
      connection = psycopg.connect(**config, connect_timeout=10)
  
      self.is_connected = True
      self.connection = connection
      return self.connection
  
imports: from collections import OrderedDict
  import psycopg
  from psycopg.postgres import types
  from psycopg.pq import ExecStatus
  from pandas import DataFrame
  from mindsdb_sql import parse_sql
  from mindsdb_sql.render.sqlalchemy_render import SqlalchemyRender
  from mindsdb_sql.parser.ast.base import ASTNode
  from mindsdb.integrations.libs.base import DatabaseHandler
  from mindsdb.integrations.libs.const import HANDLER_CONNECTION_ARG_TYPE
  from mindsdb.utilities import log
  from mindsdb.integrations.libs.response import HandlerStatusResponse, HandlerResponse, RESPONSE_TYPE
  import mindsdb.utilities.profiler
label_desc: Use image node_id 3 for calling the PostgresHandler obj's underlying member method code with example usage: obj.connect() and returns: self, self