'The placeholder here has to include MySQL\'s WKT constructor.  Because
MySQL does not support spatial transformations, there is no need to
modify the placeholder based on the contents of the given value.'

def get_geom_placeholder(self, value, srid):

    if hasattr(value, 'expression'):
        placeholder = self.get_expression_column(value)
    else:
        placeholder = ('%s(%%s)' % self.from_text)
    return placeholder
