Ado+Delphi6+access数据库如何用流将图片存储和读出?看了很多贴都没找到答案,那位高人给我发个例子,百分相赠[email protected]

Question

看了很多贴都没找到答案,那位高人给我发个Delphi6+access数据库的例子,百分相赠!我的信箱:  [email protected]
大家踊跃发言,分不够可以再开几贴!下面是两个未解决的贴三贴共三百分,前三个好例子各88分!:)
http://community.csdn.net/Expert/topic/3413/3413642.xml?temp=3.467959E-02
http://community.csdn.net/Expert/topic/3413/3413897.xml?temp=.6816828

Answer 1

pic:=tmemorystream.Create;
  jpg:=TJpegImage.Create;
  try
    with ADOQuery1 do
    begin
      TBlobField(FieldByName('字段名')).SaveToStream(pic);
    end;
    pic.Position:=0;
    jpg.LoadFromStream(pic);
    Image1.Picture.Bitmap.Assign(jpg);//读取
  finally
    pic.Free;
    jpg.Free;
  end;  tblobfield(adoquery1.FieldByName('字段名')).LoadFromStream(pic);//存入

Answer 2

学习~~~~~~~~~~~~~帮你顶上去高手们 顺便帮我看下 这个问题
http://community.csdn.net/Expert/topic/3417/3417060.xml?temp=.9449579

Answer 3

将字段设成“OLE 对象”类型。程序 hsmserver(撒哈拉之雨的悲伤)编的很好了

Answer 4

其实这个有个第三方控件的，IMAGEEN，支持数据感知的

Answer 5

一、存入
procedure TForm_pic.BitBtn1Click(Sender: TObject);
var
  j1,j2:string;
  MyJPEG : TJPEGImage;
  MS: TMemoryStream;           //需uses jpeg 单元
begin
openpicturedialog1.Execute;
j1:=openpicturedialog1.FileName;
image1.Picture.LoadFromFile(j1); //在image1显示所选的图片
j2:=AnsiUpperCase(ExtractFileExt(j1)); //大写后缀名 ExtNameif (j2='.JPG') or (j2='.BMP') then begin
j2:=AnsiUpperCase(ExtractFileName(j1));//大写文件名adotable1.Append;
adotable1.FieldValues['b']:=j1;
adotable1.FieldValues['c']:=j2;
adotable1.Post;
//以下把打开的图象文件（jpg bmp)以jpeg(jpg)方式保存到数据库中
MyJPEG := TJPEGImage.Create;
 try
    with MyJPEG do
    begin
    Assign(Image1.Picture.Graphic);
    MS:=TMemoryStream.create;
    SaveToStream(MS);
    MS.Position:=0;
    adoTable1.Edit;
    TBlobField(adoTable1.FieldbyName('a')).LoadFromStream(MS);
    adoTable1.Post;
    messagebox(getactivewindow(),'图像保存完毕！','保存',mb_ok);
    end;
 finally
    MyJPEG.Free;
end;end
else begin
showmessage('本程序只能对JPG和BMP的文件保存，请重新选择!');
end;end;
二、读出procedure TForm_pic.BitBtn5Click(Sender: TObject);
var tempstream:TStringStream;
   tempjpeg:TJPEGImage; 
begin
   try
        tempstream:=TStringStream.Create(' ');
        TBlobField(adotable1.FieldByName('a')).SaveToStream(tempstream);            
        tempstream.Position:=0;
        tempjpeg:=TJPEGImage.Create;
        tempjpeg.LoadFromStream(tempstream);
        DBImage1.Picture.Bitmap.Assign(tempjpeg);
  finally
        tempstream.Free;
        tempjpeg.Free;
end;end;

Answer 6

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      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;
　　到此用DELPHI存取JPEG文件到SQL Server数据库中的具体操作已经叙述完毕。    这是我写的代码，应用到SQL中的，我想在ACCESS数据库中应该没有什么问题。

Answer 7

ADOQuery1id: TIntegerField;
    ADOQuery1pic: TBlobField;
注：固定字段，由数据集右键添加。~~~