Urgent pls: Poor performance on update/insert

From: Aykut Canturk (aykut.canturk_at_karina-mira.com)
Date: 01/27/05 

Date: Thu, 27 Jan 2005 13:50:44 +0200

I need to update a set of records in SQL server table.
But due to neccessities, the number of records on the screen can be
different from the number of records in database.

If a record exits on database, I need to update it. if it doesn't I need to
insert a new one

the sample code is below. but the performance is very poor. I works a little
slow on development computer. I mean application and SQL server are both
installed on same PC. but it you separete them and take SQL server to
another PC on network (which is full dublex 100mbps) performace becomes very
boring stages. even for 20 records (600 total records on table) this
procedure waits very very long times like 10 to 20 seconds.

Any idea about how can I make this routine faster ? for example with single
sql statement or someting.

PS: guidid field is the key field on this table.

    cn.Open ConnectionString

    cn.BeginTrans

    sqlstr = "SELECT * FROM rackrates"

    rst.Open sqlstr, cn, adOpenDynamic, adLockOptimistic

    For a = 1 To RoomCount

 CurrentRecordGuidid = myarray(a) ' get record guidid to be updated or
added from an array

        rst.Filter = "guidid='" & CurrentRecordGuidid & "' "

        If rst.BOF And rst.EOF Then ' means no record, let's add one
            rst.AddNew
        End If

            rst("guidid") = CurrentRecordGuidid

            rst("name") = "something"

' .... update other fields

            rst.Update
    Next
    cn.CommitTrans

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