在IMAGE控件里如何正确的读入JPEG文件，并正确的从SQL SERVER7.0中读出重放回IMAGE控件?

Question

存入数据库中：  
  Image1.Picture.SaveToFile(FileName);
  Query1.close;
  Query1.Sql.Clear;
  Query1.Sql.Add('Insert into TableName Values(:name,:image)'); 
  Query1.ParamByName('name').AsString:=Edit1.Text;
  Query1.ParamByName('image').LoadFromFile(FileName,ftBlob);
  DeleteFile(FileName);
  Query1.ExecSQL;        
图片显示：uses jpegprocedure TForm1.ShowJpegClick(Sender:TObject);
var
  Jp:TJpegImage;
begin
  TBlobField(Table1.FieldByName('jpeg')).SaveToFile(FileName);
  Jp:=TJpegImage.Create;
  Jp.LoadFromFile(FileName);
  Image1.Picture.Graphic:=Jp;
end; 

Answer 1

放入1个Tbutton,TOpendialog,Timage
unit Unit1;interfaceuses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls,Jpeg, ExtCtrls, ExtDlgs;type
  TForm1 = class(TForm)
    Image1: TImage;
    Button1: TButton;
    OpenPictureDialog1: TOpenPictureDialog;
     procedure FormCreate(Sender: TObject);
    procedure FormPaint(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;var
  Form1: TForm1;
   AJPEG : TJPEGImage;
  x,y:integer;
implementation{$R *.DFM}procedure TForm1.FormCreate(Sender: TObject);
begin
  Canvas.Pen.Color:=clBlack; 
  Canvas.Pen.Style:=psSolid; 
  Canvas.Brush.color:=clBtnFace; 
  Canvas.Brush.Style:=bsSolid; //以上是Canvas的属性
  AJpeg:=TJpegImage.Create;//动态生成Jpeg; 
  AJpeg.LoadFromFile('X:\*.jpg') //打开JPEG 文件 ;
end;procedure TForm1.FormPaint(Sender: TObject);
begin
  Canvas.Rectangle(2,2,800,600);  
  x:=10; 
  y:=10;
  Form1.Canvas.Draw(x,y,AJpeg); //以(x,y)为左上角输出 JPEG 文件; end;procedure TForm1.Button1Click(Sender: TObject);
begin
if OpenPictureDialog1.Execute then
  begin
    AJpeg.Free; //释放旧AJpeg;
    AJpeg:=TJpegImage.Create; //产生新AJpeg;
    AJpeg.LoadFromFile(OpenPictureDialog1.Filename); //打开JPEG文件;
  end;
Canvas.Rectangle(2,2,800,600); 
x:=10;
y:=10;
Form1.Canvas.Draw(x,y,AJpeg); //显示新AJpeg;end;end.