render.py 文件源码

def _render_server_default(default, autogen_context):
    rendered = _user_defined_render("server_default", default, autogen_context)
    if rendered is not False:
        return rendered

    if isinstance(default, sa_schema.DefaultClause):
        if isinstance(default.arg, string_types):
            default = default.arg
        else:
            default = str(default.arg.compile(
                            dialect=autogen_context['dialect']))
    if isinstance(default, string_types):
        # TODO: this is just a hack to get
        # tests to pass until we figure out
        # WTF sqlite is doing
        default = re.sub(r"^'|'$", "", default)
        return repr(default)
    else:
        return None