code: def execute(self, statement, parameters=None):
          
          self._check_closed()
  
          if not parameters:
              # Directly execute the statement, nothing else to prepare:
              self._execute_direct(statement)
          else:
              self.executemany(statement, parameters=[parameters])
          return self
docs: Execute statement on database
          :param statement: a valid SQL statement
          :param parameters: a list/tuple of parameters
          :returns: this cursor
  
          In order to be compatible with Python's DBAPI five parameter styles
          must be supported.
  
          paramstyle	Meaning
          ---------------------------------------------------------
          1) qmark       Question mark style, e.g. ...WHERE name=?
          2) numeric     Numeric, positional style, e.g. ...WHERE name=:1
          3) named       Named style, e.g. ...WHERE name=:name
          4) format      ANSI C printf format codes, e.g. ...WHERE name=%s
          5) pyformat    Python extended format codes, e.g. ...WHERE name=%(name)s
  
          Hana's 'prepare statement' feature supports 1) and 2), while 4 and 5
          are handle by Python's own string expansion mechanism.
          Note that case 3 is not yet supported by this method!