Actually, why couldn't you just dim "objConn" globally and make it equal nothing - setting as an object when required? IsOBject wouldnt fail then.
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Check if variable has been declared in ASP
Hi,
Im writing a script and i want to check whether a variable has been declared or not. My database connection name is objConn, and so i want to check whether that variable has been declared, if it hasnt the user is on a page that has no database driven content and so i dont want to query the DB...
I use IsObject(objConn) to check whether the variable is an object but because i have option explicit on every page that returns an error...
I could turn on On Error Resume Next before the IsObject statement but i dont like to do this because i will never know if theres an error.
Any ideas or solutions anyone....
Thanks in advance
Al Higgs
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Answers
Try define a function like below to check to see if the connection establish or not:
<%
function isDBConnectionOk(dbpath)
on error resume next
set conn=server.CreateObject("
conn.Open "Provider=MICROSOFT.JET.OL
if conn.state = 1 then
isDBConnectionOk = true
else
isDBConnectionOk = false
end if
conn.close
set conn = nothing
end function
%>
then
<%
if isDBConnectionOk("E:\sites
'database connection ok
else
'database connection failed
end if
%>
Here's the answer! the vbscript function 'VarType()' will tell what type the variable is - if it isnt declared it returns as 0.
http://www.devguru.com/tec
higgsy,
You can use TypeName() too to detect what type of the variables.
Eg:
<%
Dim x
x=request("strName")
Response.Write("VarType : " & TypeName(x))
%>
But, i believe after you put "Option Explicit" should alert for any undeclare variables. Then, you can know/fix which variables is still not declare.
Regards
x_com
As you are using Option Explicit, you have to declare the variable objConn if you want to check it's status.
I would rather put a constant in the include file that determines if the connection is opened:
Const blnHasDatabase=True
Then in the files without database connection, I would put:
Const blnHasDatabase=False
Then you simply check the constant for the status:
If blnHasDatabase Then
... do the query
End If
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by: justjuicePosted on 2003-10-23 at 02:55:54ID: 9605361
objToFind = "myobj"
objfound = false
For Each Item in Application.Contents
If Item = objToFind Then
objFound = true
Exit For
End If
Next
response.write("Object found?:" & objFound)