sqlserver 中使用ado控件插入图像问题

[ljdyn]

各位大侠，怎么才能使用ADO控件向sqlserver中插入图片。
要求是，插入image控件的显示区域，因为image我已使用scrollbar使之能够显示图片的部分区域，（代码见delphi自带的scrollbar例子），如果能有对图象的放大缩小功能更好。
分不够可以一直加，小弟的可用分还是有5000多的阿，且小弟信用一直很好。
大侠们帮忙。

[ljdyn]

谁来帮帮忙阿。

[lqdmafeng]

image.savetofile(filename);
tblobfiled(query1.fieldbyname('fieldname')).loadfromfile(filename);
query1.post;
deletefile(filename);

上面是通过文件的方式，你也可以通过流的方式，在网上找找资料，而且我上面的也是凭记忆写的，只是个思路

[angle097113]

var
ms: TStringStream;
File_Type: string;
begin
if not (Shy_qry.eof and Shy_qry.bof) then
begin
ms := TStringStream.Create('');
OpenPictureDialog1.InitialDir := sm_directory;
if (OpenPictureDialog1.Execute) and (trim(OpenPictureDialog1.filename) <> '') then
begin
File_Type := ExtractFileExt(OpenPictureDialog1.filename);
if UpperCase(File_Type) <> '.JPG' then
begin
OpenPictureDialog1.Filename := BmpToJpg(OpenPictureDialog1.filename);
end;
Image1.picture.loadfromfile(OpenPictureDialog1.filename);
Image1.Picture.Graphic.SaveToStream(ms);
if not (Shy_qry.State in [dsedit, dsinsert]) then
begin
Shy_qry.Edit;
end;
Shy_qry.Fieldbyname('photo_type').AsString := Copy(OpenPictureDialog1.filename, length(OpenPictureDialog1.filename) - 2, 3);
Ms.Position := 0;
(Shy_Qry.Fieldbyname('photo') as Tblobfield).LoadFromStream(ms);
if Shy_Qry.State in [dsedit] then
begin
Shy_qry.Post;
end;
end;
ms.Free;
end
else
begin
Application.MessageBox('请先输入数据再提取照片!', '错误', MB_ICONSTOP + MB_OK);
end;
end;

[立志做一个佳娃~]

DELPHI存取JPEG文件到SQL Server数据库
　　　　　　　　　　　　　　　　　　　　　　　　　　　高红岩(ghyghost)
　
　　近日笔者书写一个小型的学生管理系统时，需要用到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)，但发现了★eagletian★高手翻译的ADO英文技术文档，里面涉及到了数据库存取JPEG文件的关键技术，在win98+sql server桌面版中测试通过，运行良好，现于源码公开如下：
unit Unit1;
interface
uses
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;
　　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。

[立志做一个佳娃~]

简便插入法

tblobfield.loadfrom(file_name);

[立志做一个佳娃~]

简便插入法

tblobfield.loadfromfile(file_name);

祝你好运............

[ljdyn]

原来网络上流传的都是ghyghost的文章，还是通过文件插入，不过也行，我使用copyrect只能对于bmp,还是能插入选中的一块。行吧，给分吧。