codegen.py 文件源码

def _get_compiled_expression(statement):
    """Returns the statement in a form where any placeholders have been filled in."""
    if isinstance(statement, TextClause):
        return statement.text

    dialect = statement._from_objects[0].bind.dialect
    compiler = statement._compiler(dialect)

    # Adapted from http://stackoverflow.com/a/5698357/242021
    class LiteralCompiler(compiler.__class__):
        def visit_bindparam(self, bindparam, within_columns_clause=False, literal_binds=False, **kwargs):
            return super(LiteralCompiler, self).render_literal_bindparam(
                bindparam, within_columns_clause=within_columns_clause,
                literal_binds=literal_binds, **kwargs
            )

    compiler = LiteralCompiler(dialect, statement)
    return compiler.process(statement)