前台delphi6后台sql2000，如何向image字段存入一JPG图象！

Question

如题
谢谢

Answer 1

read： 
TBlobField * pField=(TBlobField *)pQuery->FieldByName("Image");TBlobStream * pmem=new TBlobStream(pField,bmRead);pmem->Seek(0,soFromBeginning);Graphics::TBitmap * pBitmap=new Graphics::TBitmap();pBitmap->LoadFromStream(pmem);Image1->Picture->Assign(pBitmap);delete pBitmap;delete pmem;write：TBlobField * pField=(TBlobField *)pQuery->FieldByName("Image");TBlobStream * pmem=new TBlobStream(pField,bmWrite);pmem->Seek(0,soFromBeginning);Graphics::TBitmap * pBitmap=new Graphics::TBitmap();pBitmap->Assign(Image1->Picture->Graphic);pBitmap->SaveToStream(pmem);delete pBitmap;delete pmem;　

Answer 2

uses jpg;
var
MyJpg:TJpegImage;
with adoquery1 do
 begin
  open;
  append;
  MyJpg:=TJpegImage.create;
  try
  if openpicturedialog1.exeacte then
   MyJpg.loadfromfile(openpicturedialog1.filename);
  TBlobField(Fieldbyname('图片')).assige(MyJpg);
  finally
  MyJpg.free;
  end;
  pose;
 end;

Answer 3

uses jpeg;
.......var v_path:string;
    v_photo:TJPEGImage;
begin
  v_path:='路徑';
  v_photo:=TJPEGImage.Create;
  v_photo.LoadFromFile(v_path);
  table1.edit;
  table1.FieldByName('path').Value:=v_path;//path為路徑字段
  table1.FieldByName('photo').Assign(v_photo);//photo為圖片字段
  table1.Post;
end;

Answer 4

adoc_trans.commandtext:= 'insert  into image values (:p1)';
adoc_trans.Parameters.ParamByName('p1').LoadFromFile(ls_file, ftBlob);
adoc_trans.execute;
---------
adoc_trans为一个adocommand

Answer 5

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.如果数据库中要存储的是BMP文件，则在procedure TForm1.showbuttonClick(Sender: TObject);过程中代码更改如下即可存储显示BMP文件格式的操作。
procedure TForm1.showbuttonClick(Sender: TObject);
var
ghy:TADOBlobstream;
pic:tbitmap;
begin
ghy := TADOBlobstream.Create(Adoquery1pic, bmRead);
try
 { ghy.Seek(JpegStartsInBlob(Adoquery1pic),soFromBeginning);}
  Pic:=Tbitmap.Create;
  try
   Pic.LoadFromStream(ghy);
   Image1.Picture.Graphic:=Pic;
  finally
   Pic.Free;
  end;
finally
ghy.Free
end;
end;