Hello,

Take a look at SQLRowCount(
http://msdn2.microsoft.com/en-us/library//ms711835.aspx ). You may note:

*/For other statements and functions, the driver may define the value
returned in *RowCountPtr. For example, some data sources may be able to
return the number of rows returned by a SELECT statement or a catalog
function before fetching the rows./*

You may rely on this when using psqlODBC or ODBCng with buffering mode
ON (default).

Adam M wrote:
> Generally you would do that with a count function instead of relying
> on something else.
>
> "select * from layer where visible = 1"
>
> so I guess "SELECT COUNT(*) FROM layer WHERE visible=1" would give you
> the answer.
>
> - Adam
>
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