phpcms的limit不起作用的解决方法

{pc:get sql="SELECT * FROM v9_news ORDER BY id DESC LIMIT 2,5" cache="3600" page="$page" dbsource="discuz" return="data"}

SELECT * FROM v9_news ORDER BY id DESC LIMIT 2,5 LIMIT 0,20

{pc:get sql="SELECT title,url FROM v9_news where catid=9 and status=99 order by updatetime desc" start="0" num="4" return="v"}

{pc:get sql="SELECT title,url FROM v9_news where catid=9 and status=99 order by updatetime desc limit 0,4--" return="v"}