在ASP应用中验证用户身份(5)

五、会话终止

　　 当ASP会话结束时会运行global.asa中的Session_OnEnd方法，可以在这里删除
保存在Application("Users")数组中由于超时而被终止会话的用户。记录用户是由
于什么原因（超时还是显式退出）终止会话往往很有用处，下面的代码通过更新Users
表的TimedOut字段实现该功能：
sub Session_OnEnd
dim AppUsers
dim aUser
dim I
dim j
dim conn
dim supportsCookies
dim foundUser
on error resume next
supportsCookies=Session("SupportsCookies")
Application.Lock
AppUsers = Application("Users")
foundUser = false
for I = 0 to ubound(AppUsers)
set aUser = AppUsers(I)
if supportsCookies then
if aUser("SessionID") = Session.SessionID then
foundUser = true
end if
elseif dateAdd("n", Session.timeout, aUser("LastActivity")) < now()
then
foundUser = true
end if
if foundUser then
set conn = server.createObject("ADODB.Connection")
conn.ConnectionString=Session("ConnectionString")
conn.ConnectionTimeout=Session("ConnectionTimeout")
conn.mode=Session("Mode")
conn.open
conn.execute "UPDATE Users SET TimedOut=1 WHERE Users.Signon='" &
aUser("Signon") & "'"
conn.close
set conn=nothing
set aUser=nothing
set AppUsers(I) = nothing
for j = I to ubound(AppUsers) - 1
set AppUsers(j) = AppUsers(j + 1)
next
if ubound(AppUsers) > 0 then
redim preserve AppUsers(ubound(AppUsers) - 1)
else
AppUsers = Array()
end if
exit for
end if
next
Application("Users") = AppUsers
Application.UnLock
end sub