数据库中的jpg的问题?写、读? 请问怎么向数据库里面添加jpg图片啊?好像delphi对图形的支持不太好 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 增加:Query.Close;Query.SQL.Clear;Query.SQL.Add('INSERT INTO myimages(FileName,pic) VALUE(''Image1'',:pic)');Query.ParamByName('pic').LoadFromFile('D:\Hasd.bmp',ftBlob);Query.ExecSQL; 修改:Query.Close;Query.SQL.Clear;Query.SQL.Add('UPDATE myimages SET pic=:pic WHERE filename=''Image1''');Query.ParamByName('pic').LoadFromFile('D:\Hasd2.bmp',ftBlob);Query.ExecSQL; 哈哈(·¥·)huojiehai(海天子) 你好啊! to huojiehai(海天子)请问:你说的对jpg支持吗?你写的是bmp啊还有是LoadFromFile();只有一个参数 为了支持JPEG文件格式首先得在uees中加入jpeg单元。uses jpeg; to jiangjian0427(carabao) : huojiehai(海天子) 用的是保存文件名的方法, 那就無所謂是什麼文件了!!也許這種實現不是很好吧, 看需求, 正常, 也可直接用流寫到數據庫, 然後, 同樣用流讀出,再寫入到 Image 類 補充一句, >>好像delphi对图形的支持不太好好象是吧, 但至少對JPG支持還很好的, 在Access, MsSql2000上, 我實現我如上的方法都很正常!! DELPHI存取JPEG文件到SQL Server数据库 unit Unit1; interface usesWindows, 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}typeTForm1 = 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;varForm1: TForm1;implementation{$R *.DFM}function JpegStartsInBlob(PicField:TBlobField):integer;varghy: TADOBlobstream;buffer:Word;hx: string;beginResult := -1;ghy := TADOBlobstream.Create(PicField, bmRead);trywhile (Result = -1) and (ghy.Position + 1 < ghy.Size) dobeginghy.ReadBuffer(buffer, 1);hx:=IntToHex(buffer, 2);if hx = 'FF' then beginghy.ReadBuffer(buffer, 1);hx:=IntToHex(buffer, 2);if hx = 'D8' then Result := ghy.Position - 2else if hx = 'FF' thenghy.Position := ghy.Position-1;end; //ifend; //whilefinallyghy.Freeend; //tryend;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);tryghy.Seek(JpegStartsInBlob(Adoquery1pic),soFromBeginning);Pic:=TJpegImage.Create;tryPic.LoadFromStream(ghy);Image1.Picture.Graphic:=Pic;finallyPic.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;tryPic.LoadFromStream(ghy);Image1.Picture.Graphic:=Pic;finallyPic.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。 DELPHI存取JPEG文件到SQL Server数据库(续文) unit Unit1;interfaceusesWindows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,Db, DBCtrls, Grids, DBGrids, ADODB, ExtDlgs,jpeg, ExtCtrls, StdCtrls;typeTForm1 = class(TForm)ADOConnection1: TADOConnection;ADOQuery1: TADOQuery;DataSource1: TDataSource;DBGrid1: TDBGrid;DBImage1: TDBImage;ADOQuery1ID: TStringField;ADOQuery1FIELD: TStringField;ADOQuery1STYLE: TStringField;ADOQuery1SYSTEM: TStringField;ADOQuery1DATE: TDateTimeField;ADOQuery1PERSON1: TStringField;ADOQuery1PERSON2: TStringField;ADOQuery1PERSON3: TStringField;ADOQuery1PHOTO: TBlobField;ADOQuery1DESCRIPTION: TStringField;OpenPictureDialog1: TOpenPictureDialog;Image1: TImage;Button1: TButton;Memo1: TMemo;procedure DBImage1Click(Sender: TObject);procedure Button1Click(Sender: TObject);procedure FormShow(Sender: TObject);private{ Private declarations }public{ Public declarations }end;varForm1: TForm1;implementation{$R *.DFM}procedure TForm1.DBImage1Click(Sender: TObject);varpicstream:tadoblobstream;bmppic:tbitmap;jpgpic:tjpegimage;bmpstream:TMemoryStream;beginif form1.OpenPictureDialog1.Execute thenbeginif extractfileext(form1.openpicturedialog1.filename)='.bmp' thenbeginadoquery1.edit;picstream:=tadoblobstream.Create(tblobfield(ADOQuery1PHOTO),bmWrite);//注:上句代码中的ADOQuery1PHOTO是adoquery1中的固定字段photo的固定字段的name//用户需要手工添加固定字段,也可用fields[i]来进行选择,这点在//"DELPHI存取JPEG文件到SQL Server数据库"这篇文章中没有注释,至使许多朋友没有//编译成功。picstream.LoadFromFile(openpicturedialog1.filename);picstream.Position:=0;adoquery1.edit;tblobfield(ADOQuery1PHOTO).loadfromstream(picstream);adoquery1.post;adoquery1.edit;picstream.free;endelsebeginjpgpic:=tjpegimage.Create;bmppic:=tbitmap.Create;bmpstream:=tmemorystream.Create;jpgpic.LoadFromFile(openpicturedialog1.filename);bmppic.Assign(jpgpic);bmppic.SaveToStream(bmpstream);adoquery1.edit;picstream:=tadoblobstream.Create(tblobfield(ADOQuery1PHOTO),bmWrite);//注:上句代码中的ADOQuery1PHOTO是adoquery1中的固定字段photo的固定字段的name//用户需要手工添加固定字段,也可用fields[i]来进行选择,这点在//"DELPHI存取JPEG文件到SQL Server数据库"这篇文章中没有注释,至使许多朋友没有 //编译成功。picstream.LoadFromStream(bmpstream);picstream.Position:=0;adoquery1.edit;tblobfield(ADOQuery1PHOTO).loadfromstream(picstream);adoquery1.post;jpgpic.free;bmppic.free;bmpstream.free;adoquery1.edit;picstream.free;end;end; end;procedure TForm1.Button1Click(Sender: TObject);beginmemo1.Lines.Add(form1.openpicturedialog1.filter);end;procedure TForm1.FormShow(Sender: TObject);beginform1.openpicturedialog1.filter:='All *.jpg;*.jpeg;*.bmp;|*.jpg;*.jpeg;*.bmp;)';end;end. 为什么对数据库操作时,连接数不停增加,不减少了 问下大家? 请问如何让mainmenu运行时候没有快捷健提示? 与其他程序的交互(知道 aa.exe 启动、让它放前面、让它退后面)在线等! 论坛黑话大全! 大侠们请帮忙,安装了devexpress quantumgrid出现大问题了? 关于QRDBText控件能否过行显示 关于换系统能够继续用 delphi的问题,知道的很简单! JensiaTsang实在对不起,给分的时候漏给了,请接分! socket 的ip,host,port如何设置 怎样取一个数值型字段的第三、四位的值? 有关gridEH的超难问题??????高手请进!!
Query.Close;
Query.SQL.Clear;
Query.SQL.Add('INSERT INTO myimages(FileName,pic) VALUE(''Image1'',:pic)');
Query.ParamByName('pic').LoadFromFile('D:\Hasd.bmp',ftBlob);
Query.ExecSQL; 修改:Query.Close;
Query.SQL.Clear;
Query.SQL.Add('UPDATE myimages SET pic=:pic WHERE filename=''Image1''');
Query.ParamByName('pic').LoadFromFile('D:\Hasd2.bmp',ftBlob);
Query.ExecSQL;
(·¥·)
huojiehai(海天子)
你好啊!
请问:你说的对jpg支持吗?你写的是bmp啊
还有是LoadFromFile();只有一个参数
huojiehai(海天子) 用的是保存文件名的方法, 那就無所謂是什麼文件了!!也許這種實現不是很好吧, 看需求, 正常, 也可直接用流寫到數據庫, 然後, 同樣用流讀出,再寫入到 Image 類
>>好像delphi对图形的支持不太好
好象是吧, 但至少對JPG支持還很好的, 在Access, MsSql2000上, 我實現我如上的方法都很正常!!
DELPHI存取JPEG文件到SQL Server数据库
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。
DELPHI存取JPEG文件到SQL Server数据库(续文)
unit Unit1;interfaceuses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
Db, DBCtrls, Grids, DBGrids, ADODB, ExtDlgs,jpeg, ExtCtrls, StdCtrls;type
TForm1 = class(TForm)
ADOConnection1: TADOConnection;
ADOQuery1: TADOQuery;
DataSource1: TDataSource;
DBGrid1: TDBGrid;
DBImage1: TDBImage;
ADOQuery1ID: TStringField;
ADOQuery1FIELD: TStringField;
ADOQuery1STYLE: TStringField;
ADOQuery1SYSTEM: TStringField;
ADOQuery1DATE: TDateTimeField;
ADOQuery1PERSON1: TStringField;
ADOQuery1PERSON2: TStringField;
ADOQuery1PERSON3: TStringField;
ADOQuery1PHOTO: TBlobField;
ADOQuery1DESCRIPTION: TStringField;
OpenPictureDialog1: TOpenPictureDialog;
Image1: TImage;
Button1: TButton;
Memo1: TMemo;
procedure DBImage1Click(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure FormShow(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;var
Form1: TForm1;implementation{$R *.DFM}procedure TForm1.DBImage1Click(Sender: TObject);
var
picstream:tadoblobstream;
bmppic:tbitmap;
jpgpic:tjpegimage;
bmpstream:TMemoryStream;
begin
if form1.OpenPictureDialog1.Execute then
begin
if extractfileext(form1.openpicturedialog1.filename)='.bmp' then
begin
adoquery1.edit;
picstream:=tadoblobstream.Create(tblobfield(ADOQuery1PHOTO),bmWrite);
//注:上句代码中的ADOQuery1PHOTO是adoquery1中的固定字段photo的固定字段的name
//用户需要手工添加固定字段,也可用fields[i]来进行选择,这点在
//"DELPHI存取JPEG文件到SQL Server数据库"这篇文章中没有注释,至使许多朋友没有
//编译成功。
picstream.LoadFromFile(openpicturedialog1.filename);
picstream.Position:=0;
adoquery1.edit;
tblobfield(ADOQuery1PHOTO).loadfromstream(picstream);
adoquery1.post;
adoquery1.edit;
picstream.free;
end
else
begin
jpgpic:=tjpegimage.Create;
bmppic:=tbitmap.Create;
bmpstream:=tmemorystream.Create;
jpgpic.LoadFromFile(openpicturedialog1.filename);
bmppic.Assign(jpgpic);
bmppic.SaveToStream(bmpstream);
adoquery1.edit;
picstream:=tadoblobstream.Create(tblobfield(ADOQuery1PHOTO),bmWrite);
//注:上句代码中的ADOQuery1PHOTO是adoquery1中的固定字段photo的固定字段的name
//用户需要手工添加固定字段,也可用fields[i]来进行选择,这点在
//"DELPHI存取JPEG文件到SQL Server数据库"这篇文章中没有注释,至使许多朋友没有
//编译成功。
picstream.LoadFromStream(bmpstream);
picstream.Position:=0;
adoquery1.edit;
tblobfield(ADOQuery1PHOTO).loadfromstream(picstream);
adoquery1.post;
jpgpic.free;
bmppic.free;
bmpstream.free;
adoquery1.edit;
picstream.free;
end;
end;
end;procedure TForm1.Button1Click(Sender: TObject);
begin
memo1.Lines.Add(form1.openpicturedialog1.filter);
end;procedure TForm1.FormShow(Sender: TObject);
begin
form1.openpicturedialog1.filter:='All *.jpg;*.jpeg;*.bmp;|*.jpg;*.jpeg;*.bmp;)';
end;end.