Datasnap.DSProviderDataModuleAdapter.TDSProviderDataModuleAdapter.AS_GetParams
Delphi
function AS_GetParams(const ProviderName: OleStr; OwnerDataStream: TDBXStreamValue): OleVariant;
C++
System::OleVariant __fastcall AS_GetParams(const System::WideString ProviderName, Data::Dbxcommon::TDBXStreamValue* OwnerDataStream);
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
| function | public | Datasnap.DSProviderDataModuleAdapter.pas Datasnap.DSProviderDataModuleAdapter.hpp |
Datasnap.DSProviderDataModuleAdapter | TDSProviderDataModuleAdapter |
Description
Fetches current parameter values from the dataset bound to a specified provider.
Use AS_GetParams to retrieve the current parameter values from the dataset associated with a provider.
The ProviderName parameter specifies the name of the provider component whose dataset has the parameters.
The OwnerDataStream represents custom information that originates in a client dataset's BeforeGetParams event handler and returns information that is passed to the client dataset's AfterGetParams event handler.
AS_GetParams _result (C++) or AS_GetParams (Delphi) returns the parameters, encoded as a Variant array, where each element is a 2-element Variant array containing a parameter name and a parameter value. These parameters can be converted to a TParams object, using the UnpackParams procedure. If the dataset has no parameters, or if the provider does not support parameter fetching, AS_GetParams _result (C++) or AS_GetParams (Delphi) returns a Null Variant.
Note: AS_GetParams should not be used to retrieve output parameters from stateless application servers, because parameter values may be changed by other applications. When writing a stateless application server, retrieve parameter values using the AS_Execute method instead.