TVecColumn.ReadDataset Method

Reads the contents of underlying field and stores it's contents in vector.

Pascal

procedure ReadDataset(ReadAsComplex: boolean = false);

Reads the contents of underlying field and stores it's contents in the Vector vector. Depending on TMtxDataset.ReadWriteMode the following operation is performed:

wmRecord => read all Vector properties from current record position. The underlying dataset field must be BLOB field, otherwise an exception is raised.
wmColumn => read all values from the underlying field and store them to Vector Values. If the ReadAsComplex parameter is true then two consecutive dataset records are treated as real and imaginary part of complex number. By default, ReadAsComplex is false meaning each record in dataset is treated as one real number. The Vector Length and Complex properties are adjusted automatically.

See Also

WriteDataset, TMtxDataset.ReadWriteMode

Example

procedure TForm1.FormCreate(Sender: TObject); begin MtxDataSet.Dataset := Table1; MtxDataSet.VecColumns.Clear; with MtxDataset.VecColumns.Add do begin FieldName := 'TimeAnalysis'; ReadWriteMode := wmRecord; end; with MtxDataset.VecColumns.Add do begin FieldName := 'FFTAnalysis'; ReadWriteMode := wmRecord; end; // read only first field MtxDataset.VecColumns[0].ReadDataset; ViewValues(MtxDataset.VecColumns[0].Vector); end;

void __fastcall TForm1::FormCreate(TObject *Sender) { MtxDataSet->Dataset = Table1; MtxDataSet->VecColumns->Clear(); TVecColumn *col; col = MtxDataSet->VecColumns->Add(); col->FieldName = "TimeAnalysis"; col->ReadWriteMode = wmRecord; col = MtxDataSet->VecColumns->Add(); col->FieldName = "FFTAnalysis"; col->ReadWriteMode = wmRecord; // read only first field MtxDataset->VecColumns->Items[0].ReadDataset(false); ViewValues(MtxDataset->VecColumns-Items[0]->Vector,"",true,false,false); }

TVecColumn Class, TVecColumn Members, MtxVecDBTools Namespace, public, Example, See Also

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