怎样在delphi的数据库中加入自己的图片? 我编写了一个delphi数据库,想在数据库中加入自己的图片,但是我不知道怎样才能在数据库中加入自己的图片,我找了很多书上面都讲了加图片。不过加的是delphi自己自带的图片,我不能将自己的图片加入其中,请各位帮帮我,谢谢了!! 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 同意dbimage.picture.loadfromfile('1.jpg'); 存入:TBlobField(Table.FieldByName('tp')).LoadFromFile(d:\a.jpg);取出TBlobField(Table.FieldByName('tp')).SaveToFile(d:\a.jpg);1.儲存圖片的方法: (1).用 LoadFromFile 的方法 Table1.Insert; // 將圖片存至 Table1 的 Field1 欄位 Table1Field1.LoadFromFile('c:\Windows\Waves.bmp'); Table1.Post; (2).用 LoadFromStream 的方法 var FS: TFileStream; begin Table1.Insert; FS := TFileStream.Create('c:\Windows\Winlogo.bmp', fmOpenRead); try Table1Field1.LoadFromStream(FS); finally FS.Free; end; Table1.Post; end;2.將 Blob 欄位取出, 在 Image1 上顯示:uses jpeg;var Stream1: TFileStream;jpeg: TJPEGImage;begin Stream1 := TBlobStream.Create(Table1Field1, bmRead); // 將 Table1 的 Field1 欄位取出 try jpeg.LoadFromStream(Stream1); Image1.Picture.Assign(jpeg); finally jpeg.Free; Stream1.Free; end;end;请参考上面 ≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡████DELPHI存取JPEG文件到SQL Server数据库█████〓〓〓〓〓Ghyghost(著名关心CSDN结贴率爱国代表)〓〓〓〓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡ 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;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);varpicstream:tadoblobstream;beginadoquery1.edit;picstream:=tadoblobstream.Create(tblobfield(adoquery1.fields[1]),bmWrite);if form1.opendialog1.execute thenbeginpicstream.LoadFromFile(opendialog1.filename);picstream.Position:=0;adoquery1.edit;tblobfield(adoquery1.Fields[1]).loadfromstream(picstream);adoquery1.post;end;end;procedure TForm1.showbuttonClick(Sender: TObject);varghy:TADOBlobstream;pic:tjpegimage;beginghy := 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;finallyghy.Freeend;end;procedure TForm1.DBNavigator1Click(Sender: TObject; Button: TNavigateBtn);beginif 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);varghy:TADOBlobstream;pic:tbitmap;beginghy := 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;finallyghy.Freeend;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。 大字段存取,不要了吧,我试过,即便是jpg的存到数据库里,也是按照二进制存储,占很大空间,和bmp一样,不如存路径好了。 delphi cxgrid主从简单问题 IdHttpServer无法支持超过2G的文件下载? 线程中创建窗口,关闭时遇到的问题。 设定DbGridEh合计行信息问题,在线等 F1Book中ObjCreatePicture方法使用?? 心痛只能放在心里,只能默默的接受。给你讲个我的真实的爱情故事! 在DELPHI 中如何取得字符串的长度? 请问用什么语句可以判断一个Variant的type是否是Null? ★★★★怎么样才能达到这种效果呢★★★★ 焦点的问题? 怎样在Internet上实现文件互传!(急!!) 高分请教用treeview设计一个有4层的树型结构,急(在线等)
dbimage.picture.loadfromfile('1.jpg');
TBlobField(Table.FieldByName('tp')).LoadFromFile(d:\a.jpg);
取出
TBlobField(Table.FieldByName('tp')).SaveToFile(d:\a.jpg);
1.儲存圖片的方法:
(1).用 LoadFromFile 的方法
Table1.Insert; // 將圖片存至 Table1 的 Field1 欄位
Table1Field1.LoadFromFile('c:\Windows\Waves.bmp');
Table1.Post; (2).用 LoadFromStream 的方法
var FS: TFileStream;
begin
Table1.Insert;
FS := TFileStream.Create('c:\Windows\Winlogo.bmp', fmOpenRead);
try
Table1Field1.LoadFromStream(FS);
finally
FS.Free;
end;
Table1.Post;
end;2.將 Blob 欄位取出, 在 Image1 上顯示:
uses jpeg;
var Stream1: TFileStream;
jpeg: TJPEGImage;
begin
Stream1 := TBlobStream.Create(Table1Field1, bmRead); // 將 Table1 的 Field1 欄位取出
try
jpeg.LoadFromStream(Stream1);
Image1.Picture.Assign(jpeg);
finally
jpeg.Free;
Stream1.Free;
end;
end;
请参考上面
████DELPHI存取JPEG文件到SQL Server数据库█████
〓〓〓〓〓Ghyghost(著名关心CSDN结贴率爱国代表)〓〓〓〓
▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓
≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡
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;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;
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。