数据库的CURD

查$sql = "select * from cates where cid=$cid";

删除$sql = "delete from cates where cid=$cid" ;

修改$sql = "update cates set cname='$cname' where cid=$cid";

添加$sql="insert into lyb_message(mtitle,mcontent,mtime,ip,uid)values('$title','$content','$time','$ip','$uid')";