如何从数据库存取图片文件 如何将JPG格式的图片数据流放入数据库,如何从数据库取出将JPG格式的图片数据流 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 为了争取第一,拷了人家的:)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),但源码如下: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; 给你段代码,看那两个事件的代码就行,如果想处理jpg,那就加jpeg单元unit Unit1;interfaceuses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, DBCtrls, StdCtrls, Mask, DB, ExtCtrls, DBTables, ExtDlgs;type TForm1 = class(TForm)Table1: TTable; Panel1: TPanel; DataSource1: TDataSource; Table1NAME: TStringField; Table1SIZE: TSmallintField; Table1WEIGHT: TSmallintField; Table1AREA: TStringField; Table1BMP: TBlobField; Label1: TLabel; DBEdit1: TDBEdit; Label2: TLabel; DBEdit2: TDBEdit; Label3: TLabel; DBEdit3: TDBEdit; Label4: TLabel; DBEdit4: TDBEdit; Label5: TLabel; DBImage1: TDBImage; DBNavigator1: TDBNavigator; Button1: TButton; Button2: TButton; OpenPictureDialog1: TOpenPictureDialog; procedure Button2Click(Sender: TObject); procedure Button1Click(Sender: TObject); private { Private declarations } public { Public declarations } end;var Form1: TForm1;implementation{$R *.dfm}procedure TForm1.Button2Click(Sender: TObject);begin if OpenPictureDialog1.Execute then begin table1.Edit; //DBImage1.Picture.LoadFromFile(OpenPictureDialog1.FileName); TBlobField(table1.FieldByName('bmp')).LoadFromFile(OpenPictureDialog1.FileName); table1.Post; end;end;procedure TForm1.Button1Click(Sender: TObject);begin if OpenPictureDialog1.Execute then begin table1.Edit; //DBImage1.Picture.LoadFromFile(OpenPictureDialog1.FileName); //使用TBLOBFIELD类实现保存图象 TBlobField(table1.FieldByName('bmp')).LoadFromFile(OpenPictureDialog1.FileName); table1.Post; end;end;end. glfwyz()你的代码可是我的哦,代码再http://expert.csdn.net/Expert/topic/2070/2070079.xml?temp=9.132022E-02karach(卡车) 有没有能用在dellphi2010中的Ehdbgrid 如何捕获TWebBrowser中网页的按钮点击事件?? 怎么去掉约束! 用FR写一个报表的DLL的问题 DELPHI中是否有类似于网页设计中的session变量? delphi技术难题,我刚刚才发现的 怎样实现一个表对多个表的Relation关系? 在delphi中如何获取位图数据的起始位置。 应用程序服务器已运行,当连接时为何会再产生一个应用程序服务器的运行 我很盲目!!怎么办??谁来帮助我!!! Table,Query,..etc 怎样将二笔记录集合并。。。 (高难) 结束程序
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),但源码如下:
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;
type TForm1 = class(TForm)
Table1: TTable;
Panel1: TPanel;
DataSource1: TDataSource;
Table1NAME: TStringField;
Table1SIZE: TSmallintField;
Table1WEIGHT: TSmallintField;
Table1AREA: TStringField;
Table1BMP: TBlobField;
Label1: TLabel;
DBEdit1: TDBEdit;
Label2: TLabel;
DBEdit2: TDBEdit;
Label3: TLabel;
DBEdit3: TDBEdit;
Label4: TLabel;
DBEdit4: TDBEdit;
Label5: TLabel;
DBImage1: TDBImage;
DBNavigator1: TDBNavigator;
Button1: TButton;
Button2: TButton;
OpenPictureDialog1: TOpenPictureDialog;
procedure Button2Click(Sender: TObject);
procedure Button1Click(Sender: TObject);
private { Private declarations }
public { Public declarations }
end;
var Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button2Click(Sender: TObject);
begin if OpenPictureDialog1.Execute then
begin
table1.Edit;
//DBImage1.Picture.LoadFromFile(OpenPictureDialog1.FileName); TBlobField(table1.FieldByName('bmp')).LoadFromFile(OpenPictureDialog1.FileName); table1.Post;
end;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin if OpenPictureDialog1.Execute then
begin
table1.Edit;
//DBImage1.Picture.LoadFromFile(OpenPictureDialog1.FileName);
//使用TBLOBFIELD类实现保存图象
TBlobField(table1.FieldByName('bmp')).LoadFromFile(OpenPictureDialog1.FileName); table1.Post;
end;
end;
end.
karach(卡车)