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Recordsets: Cursor Location: Client Vs Server: I am confused

Posted on 2004-04-15
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Last Modified: 2008-02-01
I know that when the a recordset is opened this way, the entire data will be "transferred" to the client and I can close the connection. Am I right?

Set adoRs.ActiveConnection = adoConn
adoRs.CursorLocation=adUseClient
adoRs.CursorType=adOpenStatic
adoRs.Open "SELECT * FROM TB_USERS"
Set adoRs.ActiveConnection = Nothing

What I am confused about is, what happens in the case below? Is the data transferred to the client? If YES then how is the data kept in sync (its a dynamic cursor). If the data is NOT transferred, then what is the use of specifying CursorLocation as dUseClient? I have not tried this code. I just want to know whether I am thinkng it right.

Set adoRs.ActiveConnection = adoConn
adoRs.CursorLocation=adUseClient
adoRs.CursorType=adOpenDynamic  'CHANGE FROM adOpenStatic TO adOpenDynamic
adoRs.Open "SELECT * FROM TB_USERS"
Set adoRs.ActiveConnection = Nothing

Also what happend if I use a adOpenKeyset instead?

I just want to get a clear picture of what happens with these and all other possible combinations? Especially the use of adUseClient and when the data is really on the client.

Thanks
Vickram
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Question by:VICKRAM
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10 Comments
 
LVL 71

Expert Comment

by:Éric Moreau
ID: 10832094
most options (like keyset and dynamic) are only usable when you use a server sided live cursor.
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LVL 13

Author Comment

by:VICKRAM
ID: 10832134
do you mean VB ignores the CursorLocation property when CursorType is keyset or dynamic ?
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Expert Comment

by:Éric Moreau
ID: 10832190
CursorLocation is the strongest property.
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Author Comment

by:VICKRAM
ID: 10832217
i did not understand wht u meant by  strongest property
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LVL 71

Expert Comment

by:Éric Moreau
ID: 10832237
the predominant. If you set the CursorLocation to adUseClient, the CursorType is modified for adOpenStatic
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Author Comment

by:VICKRAM
ID: 10832295
you mean If I set the CursorType to Dynamic/Keyset/ForwardOnly it will change to Static, if the cursorlocation is set to Client?
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LVL 71

Expert Comment

by:Éric Moreau
ID: 10832318
Yes. Also not all providers (for exemple Jet) are supporting all ADO options.
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Author Comment

by:VICKRAM
ID: 10832342
Does that mean that the only way to get all the data actually to the client machine is to use Client cursor location and cursortype as static?
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Accepted Solution

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Éric Moreau earned 400 total points
ID: 10832381
As soon as you open a Client-sided cursor, all the data is downloaded to the client.
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