TsgcWSPClient_Dataset › Events › OnMetaData

OnMetaData Event

Fires when the server answers a GetMetaData request with the Dataset field definitions.

Syntax

property OnMetaData: TsgcWSMetaDataEvent;
// TsgcWSMetaDataEvent = procedure(Connection: TsgcWSConnection; const JSON: IsgcObjectJSON) of object

Default Value

—

Remarks

Raised in response to a GetMetaData call. JSON is an array where each item describes a server-side field through the properties fieldname, datatype, datasize and keyfield. Use this event to build a client-side Dataset schema that matches the server before performing an initial Synchronize.

Example

procedure TForm1.oProtocolMetaData(Connection: TsgcWSConnection;
  const JSON: IsgcObjectJSON);
var
  i: Integer;
  vFieldName, vDataType: string;
  vDataSize: Integer;
  vKeyField: Boolean;
begin
  for i := 0 to JSON.Count - 1 do
  begin
    vFieldName := JSON.Item[i].Node['fieldname'].Value;
    vDataType := JSON.Item[i].Node['datatype'].Value;
    vDataSize := JSON.Item[i].Node['datasize'].Value;
    vKeyField := JSON.Item[i].Node['keyfield'].Value;
  end;
end;

Back to Events