[求助]为什么登录不上，又不显示错误呢？

我作的用函数来判断用户是否有登录记录的登录网页，加了函数判断后，即登录不了，又不报错，不知什么原因，想请各位前辈高人指教。函数代码和登录后的记录代码如下（其余省了）。
函数代码：
Function checksysIswork() '用户登录检查
    Set rs=Server.CreateObject("adodb.recordset")
    Sql="SELECT * FROM kaoqing_table WHERE user='"&username&"' and recordYear="&Year(Now())&" and recordMonth="&Month(Now())&" and recordDay="&Day(Now())&""
    rs.Open sql,conn,1,1
    if rs.eof then
        checksysIswork=FALSE
        else
         if Iswork=0 then
           checksysIswork=TRUE
        else
           checksysIswork=FALSE
        end if
    End if
    rs.close
    conn.close
End Function
登记并记录代码：
  If Session("level")=3 and checksysIswork="True" Then
         set rs=server.createobject("adodb.recordset")
         insertsql="select * from kaoqing_table"
         rs.open insertsql,db,1,3
         rs.addnew
  
         rs("user")=username
         rs("recordYear")=Year(Now())
         rs("recordMonth")=Month(Now())
         rs("recordDay")=Day(Now())
         rs("recordTime")=Time
         rs("Iswork")=1
         rs("note")=note
         
         rs.update
   
         rs.close
        set rs=nothing
       Response.Redirect("normal.asp")
         Response.End