的FireDAC樣本項目(示範ArrayDML)c:\Users\Public\Documents\Embarcadero\Studio\19.0\Samples\Object Pascal\Database\FireDAC\Samples\Comp Layer\TFDQuery\ExecSQL\Batch\Batch.dproj
編譯與上Params[2].AsBlobs
分配2個// W1058 Implicit string cast with potential data loss from string to rawbytestring
警告與//W 1058
表示:Params.asBlob分配給W1058
procedure TfrmBatch.btnExecSQLClick(Sender: TObject);
var
i: Integer;
iTm: LongWord;
begin
qrySelect.Open;
qrySelect.ServerDeleteAll(True);
qrySelect.Close;
with qryBatch do
if cbxBatchExec.Checked then begin
Params.ArraySize := StrToInt(edtArraySize.Text);
iTm := GetTickCount;
for i := 0 to Params.ArraySize - 1 do begin
Params[0].AsIntegers[i] := i;
Params[1].AsStrings[i] := 'string' + IntToStr(i);
Params[1].Size := 20;
if cbxInsertBlob.Checked then
Params[2].AsBlobs[i] := 'blob' + IntToStr(i); // W1058
end;
Execute(Params.ArraySize);
iTm := GetTickCount - iTm;
end
else begin
Params.ArraySize := 1;
iTm := GetTickCount;
for i := 0 to StrToInt(edtArraySize.Text) - 1 do begin
Params[0].AsInteger := i;
Params[1].AsString := 'string' + IntToStr(i);
Params[1].Size := 20;
if cbxInsertBlob.Checked then
Params[2].AsBlob := 'blob' + IntToStr(i); // W1058
ExecSQL;
end;
iTm := GetTickCount - iTm;
end;
StatusBar1.SimpleText := 'Time executing is ' + FloatToStr(iTm/1000.0) + ' sec.';
qrySelect.Open;
end;
什麼是解決這個正確的方法是什麼? (在FireDAC下,AsBlobs在Windows下已更改爲TFDByteString
= RawByteString
)。這兩種鑄造爲RawByteString()
或Params[2].Value
分配使編譯器警告消失,但我不能確定它這不會導致潛在的問題......