OracleDataAdapter.Requery

Question

I'm trying to avoid soft parses when I reexecute a piece of SQL. The Requery parameter on OracleDataAdapter seems to be what I want, but I can't get it to work. Can anyone advise me as to exactly what the Requery parameter is used for. Some sample code would be great.
The docs say of requery:
This property determines whether the SelectCommand is reexecuted on the next
call to Fill.
My example code looks like this. The connection used is created once then the code below is executed many times.
DataSet ds = new DataSet();
string sql="SELECT A,B FROM mytable WHERE ID= :1";
OracleCommand cmd = new OracleCommand( sql, connection );
cmd.Parameters.Add( "ID", OracleDbType.Decimal ).Value = theID;
OracleDataAdapter dataAdapter = new OracleDataAdapter();
dataAdapter.SelectCommand = cmd;
dataAdapter.Requery = false;
dataAdapter.Fill( ds, "Assets" );
sqltrace shows for this SQL:
call count
Parse 250
Execute 250
Fetch 250
total 750
I would have expected if the "selectcommand was not being reexecuted then parses would be 1, i.e. I have achieved my goal of eliminating soft parses.
thanks
Dale

Answer 1

Requery feature is not meant to reduce the number of soft parses. This feature is designed to reduce the number of roundtrips if the data is being fetched for a specific range of rows.
For example, if a table has 20 rows, and you fill the dataset in steps for 1 to 10 rows and then 11 to 20 rows, SQL statement is executed twice as per ADO.NET spec. By setting Requery to false, you avoid the second roundtrip as the second set of rows are fetched from the same cursor.