MASQL中ifNull函数在xml文件中怎么写？

Question

MASQL中ifNull函数在xml文件中怎么写

Answer 1

<%@LANGUAGE="VBSCRIPT" CODEPAGE="65001"%>
<%
Response.ContentType="application/xml"
Response.Charset="utf-8"
response.cachecontrol="no-cache"
response.addHeader "pragma","no-cache"
response.expires=-1
response.expiresAbsolute=now-1

db="file.mdb" '数据库路径，相对路径
set conn = server.CreateObject("adodb.connection")
conn.Open "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Server.MapPath(db)

Response.Write("<?xml version=""1.0"" encoding=""utf-8""?>")
set rs=Server.CreateObject("adodb.recordset")
rs.open "SELECT * FROM [file]",conn,1,1
if rs.Eof and rs.Bof then
Response.Write("<vcaster>")
Response.Write ("<item item_url=""no file"" item_title=""no file"">")
Response.Write("</item>")
Response.Write ("</vcaster>")
else
Response.Write("<vcaster>")
do while Not rs.Eof

Response.Write ("<item item_url="""&rs("fileurl")&""" item_title="""&rs("name")&""">")
Response.Write("</item>")

if rs.Eof then
Exit do
End if
rs.MoveNext
Loop
Response.Write ("</vcaster>")
End if
rs.Close
Set rs=Nothing
conn.Close
Set conn=Nothing
%>

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Answer 2

SQL Syntax 1:
IFNULL( expression, replacement )
Parameters:
expression
Any expression of any type. This expression is check for NULL.
replacement

The return value if the expression is NULL.

Escape Syntax:
{fn IFNULL( expression, replacement )}
Return Type:
The same as the numeric expression.

SQL SYNTAX 2:
IFNULL( expression )
Return Type:
BOOLEAN

SELECT ifnull( name , '')