调用uid=5的用户 classid=6的分类 里的4条数据
<!--{block name="uchblog" parameter="sql/SELECT * FROM uchome_blog LEFT JOIN uchome_class ON uchome_blog.classid=uchome_class.classid WHERE uchome_blog.uid=5 and uchome_blog.classid=6 ORDER BY uchome_blog.dateline desc LIMIT 0,4/cachetime/900/cachename/focus_i"}-->