functions >
isnull

is it null ? true or false

辨識是否為無資料的VBscript函數

is null = chcek if it is null for true?

------ attention -------
Empty is false fot null

有東西: 布林運算IsNull()就會回應False
沒東西: 布林運算IsNull()就會回應True

<%

if isnull(rs("aData")) then

end if

%>

<%

if not isnull(rs("aData")) then

end if

%>


------------------------------------
<% 

bData=Empty
if IsNull(bData) then
response.write "it is true"
else
response.write "it is false"
end if

%>

----- Example 2 isnull() code script -----
<%
dim string

string="012345"

If isNull(string) Then

response.write IsNull(string)&"<br>"
response.write((string))

else

response.write (string)&"<br>"
response.write(isNull(string))

end if

%>

可運用檢查資料或字串是否為空的

it is false

Example 2:

012345
False

---- -------------- -----
not isnull(  ) , isnull(  )

error: isnotnull(  ) , notnull(  )

---- ---------- ----