在DELPHI中更簡單的存取JPEG文件到SQLSERVER數據庫

最近在CSDN上看到兩篇關於《DELPHI中存取JPEG文件到SQLSERVER》中的文章之後,覺得其中講述的方法雖然有可取之處,但頗費時,我這裡有更簡單的操作方法，而且安全可靠,不敢一人獨享,願發佈出來與大家共享。在Delphi7.0+Win2000+SqlServer 2000中測試通過，運行良好，現將思路、源碼公開如下：

解決思路：

1、 關鍵在於將打開的JPEG文件動態轉換為Tbitmap對象並顯示在Timage對像中；

2、 將顯示的圖片提交到數據庫中。

本例中在SQLSERVER2000中建立了一個試例表：exam(xm char(10),photo image)；

程序源代碼：

unit SavePic;

interface

uses

Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

Dialogs, ExtDlgs, ExtCtrls, DBCtrls, Grids, DBGrids, DB, ADODB, Buttons,

StdCtrls,Jpeg;

type

TForm1 = class(TForm)

SpeedButton1: TSpeedButton;

ADOConnection1: TADOConnection;

Table1: TADOTable;

DataSource1: TDataSource;

DBGrid1: TDBGrid;

DBImage1: TDBImage;

Image1: TImage;

SpeedButton2: TSpeedButton;

OpenPictureDialog1: TOpenPictureDialog;

Label1: TLabel;

Label2: TLabel;

Edit1: TEdit;

SpeedButton3: TSpeedButton;

PRocedure SpeedButton2Click(Sender: TObject);

procedure SpeedButton1Click(Sender: TObject);

procedure SpeedButton3Click(Sender: TObject);

private

{ Private declarations }

public

{ Public declarations }

end;

var

Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.SpeedButton2Click(Sender: TObject);

var

bmp1:TBitmap;

jpg1:TJpegImage;

begin

OpenPictureDialog1.DefaultExt:=GraphicExtension(TJpegimage);

if OpenPictureDialog1.Execute then

begin

bmp1:=TBitmap.Create;

jpg1:=TJpegImage.Create;

try

jpg1.LoadFromFile(OpenPictureDialog1.FileName);

bmp1.Assign(jpg1);

Image1.Picture.Bitmap.Assign(bmp1);

finally

jpg1.Free;

bmp1.Free;

end;

end;

end;

procedure TForm1.SpeedButton1Click(Sender: TObject);

begin

table1.Open;

table1.insert;

table1.fieldbyname('xm').asstring:=Edit1.Text;

table1.FieldByName('photo').Assign(Image1.Picture);

table1.post;

table1.Refresh;

end;

end.