求中段代码的详细说明

sql="select * from SoftDown_SoftInfo where SoftID="&SoftID
rs.open sql,conn,1,1
'下面是赋值给变量 下面用到
DayDate=trim(rs("DayDate"))
WeekDate=trim(rs("WeekDate"))
MonthDate=trim(rs("MonthDate"))
AllHits=trim(rs("AllHits"))
avgGrade=trim(rs("avgGrade"))
Points=rs("Points")

'更新软件下载次数
sql="update SoftDown_SoftLink set Hits=Hits+1 where Id=" & cstr(request.QueryString("ID"))
conn.execute sql
'更新浏览或者点击次数(原来基础上+1)

sql="update SoftDown_SoftInfo set AllHits=AllHits+1,DayHits=DayHits+1,WeekHits=WeekHits+1,MonthHits=Monthhits+1 where SoftId=" & SoftID
conn.execute sql
'更新总点击量 当日点击量 周点击量 月点击量(原来基础上+1)

if datediff("H",DayDate,Now)>=24 then
sql="update SoftDown_SoftInfo set DayDate=Now(),DayHits=1 where SoftId=" & SoftID
conn.execute sql      
end if
'更新记录日期不是当前日期软件信息表的记录 设置日期为当前时间 日点击量+1 条件为
'以下类似 周/月
if datediff("D",WeekDate,Now)>=7 then
sql="update SoftDown_SoftInfo set WeekDate=Now(),WeekHits=1 where SoftId=" & SoftID
conn.execute sql
end if

if datediff("D",MonthDate,Now)>=31 then
sql="update SoftDown_SoftInfo set MonthDate=Now(),MonthHits=1 where SoftId=" & SoftID
    conn.execute sql
end if

rs.close