怎么样实现jpg图片直接存取SQL SERVER数据??

Question

在DBIMAGE里怎么样实现jpg图片直接存取SQL SERVER数据??
我是把jpg格式转成bmp格式存的,请问有没有更好的方法?
还有jpg格式转成bmp格式后体积会大多少??谢谢帮助!!

Answer 1

http://218.56.11.178:8020/web/index.aspx
->下载基地->例程-数据库/报表->数据库图片存储
是用accsee做的，和sql server的非常相似，上次介绍个一个伙计，人家看不懂，不知你怎样？
今天用sql server又写了一个，如果你实在看不懂的话，给我发消息，我把今天做sql server的发给你。

Answer 2

uses Jpeg; 
var 
    JPGImage:TJpegImage;
    bitmap:tbitmap;
    bitmap:=tbitmap.create;
    JPGImage:=Tjpegimage.Create;
    JPGImage.LoadFromfile(openpicturedialog1.FileName);
    bitmap.assign(jpgimage);
    DBImage1.picture.bitmap.assign(bitmap);

Answer 3

下面的代码是 JPG 格式：//  存储 JPG 图片到数据库 ， 同时显示在 FOOTIMAGE 控件上 FootImage:TImage
var
  tempStream:TMemoryStream;
  JpgPic:TJpegImage;
  
  S:String;
begin
        try
          JpgPic:=TJpegImage.Create;
          tempStream:=TMemoryStream.Create;
          tempStream.Clear;
          Table.Edit;
          JpgPic.LoadFromFile(OpenDialog.FileName);
          FootImage.Picture.bitmap.assign(JpgPic);
          JpgPic.SaveToStream(tempStream);
          TBlobField(Table.FieldByName('图象')).LoadFromStream(tempStream) ;
          Table.Post;
        finally
          JpgPic.Free;
          tempStream.Free;
        end;
 end;//  显示数据库中的 JPG 图象 ，FootImage : TImage
 var
  MyJpeg:TJpegImage;
  MyStm:TMemoryStream;
begin
  
  if not Table.FieldByName('图象').IsNull then
  begin
    try
      MyJpeg:=TJpegImage.Create;
      MyStm:=TMemoryStream.Create;
      MyStm.Clear;
      TBlobField(Table.FieldByName('图象')).SaveToStream(MyStm);
      MyStm.Position:=0;
      MyJpeg.LoadFromStream(MyStm);
      FootImage.Picture.BitMap.Assign(MyJpeg);
    finally
      MyJpeg.Free;
      MyStm.Free;
    end;
 
end;

Answer 4

DELPHI存取JPEG文件到SQL Server数据库  
用ADO控件存取SQL Server数据库图片，查看资料发现基本都是针对BMP文件进行操作(巨增数据库大小)，源码公开如下：
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 5

TO karach(卡车) 上面的代码是您的原创吗？？：）