Frequently Asked Questions

Using Stored Procedures

Question:

How do I use stored procedures in a multi-tier environment?

Answer:

You'll need to get the provider interface and set the

parameters before trying to open the client dataset.

Unfortunately there is no way to do this at design time,

but it should work OK at run time.  Here is some code that

shows basically what you need to do:



procedure TDBClientTest.Button3Click(Sender: TObject);

var

  Params: Variant;

begin

  ClientData.Provider := RemoteServer1.GetProvider('ProviderName');

  Params := VarArrayCreate([0, 1], varVariant);

  Params[0] := VarArrayOf(['@InParam1', 101]);

  Params[1] := VarArrayOf(['@InParam2', 'test_param']);

  ClientData.Provider.SetParams(Params);

  ClientData.Open;

end;



This example assumes the stored procedure takes 2

parameters, and binds them by name.   If you need to

update the data returned from a stored procedure, you

will need to use a TUpdateSQLProvider.