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How to update memo using adchunk and ADO/ODBC?
Message
De
15/03/2005 19:24:31
Cetin Basoz
Engineerica Inc.
Izmir, Turquie
 
 
Information générale
Forum:
Visual FoxPro
Catégorie:
Problèmes
Divers
Thread ID:
00996096
Message ID:
00996152
Vues:
17
>I need to update a memo field using ADO from as ASP application. I've looked at KB Q208208. It only shows how to add a new record and populate the memo using the "adchunk" approach. I need to know how use this to update a memo in an existing record. I have a free table with a CDX file that has 3 indices. I need to know how to fetch a single record's memo using a unique key value (like using "set order to" then doing a seek in VFP), and then write back an updated version of them memo, all with ADO. I know the syntax for creating a connection, etc, but I don't know the rules/techniques for performing these simple steps. Can somebody help me? Thanks very much!
>
>Here's what I'm getting: Microsoft OLE DB Provider for ODBC Drivers (0x80004005)
>[Microsoft][ODBC Visual FoxPro Driver]Cannot update the cursor.
>
>Here's the code snippet, given the memo field "comments"
>
>* This is already done successfully:
>Select Comments  From MyDBF Where ID=SomeUniqueKeyVal
>* ID is a field that is indexed alone in a rushmore-optimized index
>* Assume the connection is named "conn" and the recordset is named "rs"
>* Set up the test:
>cLongParm=rs("comments") + chr(13) + string(254,"A")
>liChunkSize = 254
>Rs.Fields("comments")=""
>FOR i = 1 to len(lcLongParm) step liChunkSize
>  liStartAt = i
>  liWorkString = mid(lcLongParm, liStartAt, liChunkSize)
>  Rs.Fields("comments").AppendChunk(liWorkString)
>NEXT
>conn.execute "Set Reprocess to 5 seconds",,1
>* This fails:
>Rs.Update
>
It's saying "Cannot update the cursor". W/o memo can it? It sounds more like a security problem.
Cetin
Çetin Basöz

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