В разделе приведено описание пользовательского алгоритма получения данных, реализованного в виде класса MyDtCustomProvider на языке Fore.
Данные загружаются из текстового файла «C:\Data_Out.txt».
Добавьте ссылки на системные сборки: Dt, Xml.
Public Class MyDtCustomProvider: Object, IDtCustomProvider
_mb: IMetabase;
p: IDtTextProvider;
fs: IDtFieldDefinitions;
m_active, keep: Boolean;
Public Constructor MyDtCustomProvider;
Begin
m_Active := False;
End Constructor MyDtCustomProvider;
Public Sub Open;
Begin
m_Active := True;
If p = Null Then
p := New DtTextProvider.Create;
p.File := "C:\Data_Out.txt";
End If;
p.RangeHasHeader := True;
p.Open;
End Sub Open;
Public Sub Close;
Begin
m_Active := False;
p.Close;
End Sub Close;
Public Sub Save(Element: IXMLDOMElement);
Begin
p.Save(Element);
End Sub Save;
Public Sub Load(Element: IXMLDOMElement);
Begin
If p = Null Then
p := New DtTextProvider.Create;
p.File := "C:\Data_Out.txt";
End If;
End Sub Load;
Public Sub FieldsFromFile;
Begin
p.FieldsFromFile;
End Sub FieldsFromFile;
Public Property GetType: DtObjectType
Get
Begin
Return DtObjectType.TDtTextProvider;
End Get
End Property GetType;
Public Sub ClearFields;
Begin
p.ClearFields;
End Sub ClearFields;
Public Sub Fetch(Var Values: Array);
Begin
p.Fetch(Values);
End Sub Fetch;
Public Function FetchRows(Count: Integer; Var Values: Array): Integer;
Var
i: Integer;
Begin
i := p.FetchRows(Count, Values);
Return i;
End Function FetchRows;
Public Function ReadingRowsCount: Integer;
Begin
Return p.ReadingRowsCount;
End Function ReadingRowsCount;
Public Function ImplementFetchRows: Boolean;
Begin
Return True;
End Function ImplementFetchRows;
Function get_Eof: Boolean;
Begin
Return p.Eof;
End Function get_Eof;
Function get_Fields: IDtFieldDefinitions;
Begin
If fs = Null Then
fs := p.Fields;
End If;
Return fs;
End Function get_Fields;
Function get_Active: boolean;
Begin
Return m_Active;
End Function get_Active;
Function get_getType: dtobjecttype;
Begin
Return dtobjecttype.TDtUserProviderEx
End Function get_getType;
Public Function get_Metabase: IMetabase;
Begin
Return _mb;
End Function get_Metabase;
Public Sub set_Metabase(metabase: IMetabase);
Begin
_mb := metabase;
End Sub set_Metabase;
Function get_KeepCalcFields: Boolean;
Begin
Return keep;
End Function get_KeepCalcFields;
Sub set_KeepCalcFields(Value: Boolean);
Begin
keep := Value;
End Sub set_KeepCalcFields;
End Class MyDtCustomProvider;
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