kingcms的asp版本的如何实现if标签

        {if {king:from/}='' then}
       暂无来源
       {else}
       来源：{king:from/}
       {end if}

        {king:if len("(king:title/)")>0}<span>{king:title/}</span>{/king:if}

{king:sql cmd="select kc_from from king__article_page where kup=0 and kid= (king:kid/) "}
                             {/king}