SQL2000数据库,jpg图片的字段如何存放？

Question

组件Image只处理BMP格式,请高手指点

Answer 1

unit Unit1;interfaceuses
 Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
 ExtCtrls, DBCtrls, Grids, DBGrids, Db, ADODB,jpeg, StdCtrls,dbtables;
  {一定要USES JPEG单元,使能存储JPG文件格式}
type
 TForm1 = class(TForm)
   DataSource1: TDataSource;
   ADOQuery1: TADOQuery;
   DBGrid1: TDBGrid;
   DBNavigator1: TDBNavigator;
   Image1: TImage;
   savebutton: TButton;
   showbutton: TButton;
   OpenDialog1: TOpenDialog;
   ADOQuery1id: TIntegerField;
   ADOQuery1pic: TBlobField;
   procedure savebuttonClick(Sender: TObject);
   procedure showbuttonClick(Sender: TObject);
   procedure DBNavigator1Click(Sender: TObject; Button: TNavigateBtn);
 private
   { Private declarations }
 public
   { Public declarations }
 end;var
 Form1: TForm1;implementation{$R *.DFM}function JpegStartsInBlob(PicField:TBlobField):integer;
  var
   ghy: TADOBlobstream;
   buffer:Word;
   hx: string;
  begin
   Result := -1;
   ghy := TADOBlobstream.Create(PicField, bmRead);
   try
    while (Result = -1) and (ghy.Position + 1 < ghy.Size) do
    begin
     ghy.ReadBuffer(buffer, 1);
     hx:=IntToHex(buffer, 2);
     if hx = ’FF’ then begin
      ghy.ReadBuffer(buffer, 1);
      hx:=IntToHex(buffer, 2);
     if hx = ’D8’ then Result := ghy.Position - 2
      else if hx = ’FF’ then
            ghy.Position := ghy.Position-1;
     end; //if
    end; //while
    finally
     ghy.Free
    end;  //try
  end;
procedure TForm1.savebuttonClick(Sender: TObject);
var
picstream:tadoblobstream;
begin
adoquery1.edit;
picstream:=tadoblobstream.Create(tblobfield(adoquery1.fields[1]),bmWrite);
if form1.opendialog1.execute then
begin
picstream.LoadFromFile(opendialog1.filename);
picstream.Position:=0;
adoquery1.edit;
tblobfield(adoquery1.Fields[1]).loadfromstream(picstream);
adoquery1.post;
end;
end;procedure TForm1.showbuttonClick(Sender: TObject);
var
ghy:TADOBlobstream;
pic:tjpegimage;
begin
ghy := TADOBlobstream.Create(Adoquery1pic, bmRead);
try
 ghy.Seek(JpegStartsInBlob(Adoquery1pic),soFromBeginning);
 Pic:=TJpegImage.Create;
 try
  Pic.LoadFromStream(ghy);
  Image1.Picture.Graphic:=Pic;
 finally
  Pic.Free;
 end;
finally
ghy.Free
end;
end;procedure TForm1.DBNavigator1Click(Sender: TObject; Button: TNavigateBtn);
begin
if button in [nbFirst, nbPrior, nbNext, nbLast] then showbutton.Click;
end;end.

Answer 2

海龙：
　　那字段的编辑组件还是Image，是吧？

Answer 3

海龙同志：
    Adoquery1pic这是什么呢？编译时有错，请再指示

Answer 4

再寻海龙同志给予支持一下，好吗？
能否将你的Demo程序发到