delphi将图片保存到SQL数据库和读取图片

1. procedure TForm1.LoadPictureClick(Sender: TObject);  // 上传图片begin  OpenPictureDialog1.Title := '打开图片';  if OpenPictureDialog1.Execute then  begin    Image1.Picture.LoadFromFile(OpenPictureDialog1.FileName);  end;end;

2. procedure TForm1.saveClick(Sender: TObject);   //保存var  Stream:TMemoryStream;begin  try    Stream := TMemoryStream.Create; //  创建内存流    Image1.Picture.Graphic.SaveToStream(Stream);   // 将图片保存到内存流中

      //Image1.Picture.LoadFromFile(OpenPictureDialog1.FileName);（另一种方法）    adoquery1.Close;    adoquery1.SQL.Clear;    adoQuery1.SQL.Add('Insert into test3 values (:id,:photo)');    ADOQuery1.Parameters.ParamByName('id').Value := editId.Text;    adoQuery1.Parameters.ParamByName('photo').LoadFromStream(Stream,ftBlob); // 读取保存的内存图    adoquery1.ExecSQL;  finally    Stream.Free;     // 释放内存流  end;end;

3. procedure TForm1.ReadClick(Sender: TObject);   // 读取图片var  Stream:TMemoryStream;  Jpg:TjpegImage;begin  ADOQuery1.Close;  ADOQuery1.SQL.Text:='SELECT * FROM test3 where id =' + editId.Text;   // 查询图片  ADOQuery1.Open;  if not ADOQuery1.FieldByName('photo').IsNull then  begin    Stream:=TMemoryStream.Create ;    Jpg:=TjpegImage.Create ;    TBlobField(ADOQuery1.FieldByName('photo')).SaveToStream(Stream);    // 显示的转换为BlobField并保存到内存流    Stream.Position :=0;    jpg.LoadFromStream(Stream);    // 加载图片    image2.Picture.Assign(Jpg);  end  else  begin    image2.Picture :=nil;  end;

       Stream.Free;

       Jpg.Free;end;

   END