DELPHI ADO /ODAC 實現BLOB存取(文件大小不限制)
通過ADO,ODAC實現文件上傳和讀取,具體代易做图如下:
源代易做图下載鏈接: http://download.csdn.net/download/xiechunlei8454/3875686
unit Unit1;
inte易做图ce
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, Grids, ValEdit, DB, ADODB, StdCtrls, DBAccess, Ora, MemDS,
ExtCtrls, jpeg;
type
TForm1 = class(TForm)
adc: TADOConnection;
os1: TOraSession;
Edit1: TEdit;
Label1: TLabel;
Label2: TLabel;
Edit2: TEdit;
Button1: TButton;
Button2: TButton;
Button3: TButton;
opd1: TOpenDialog;
adq1: TADOQuery;
oq1: TOraQuery;
Button4: TButton;
Button5: TButton;
Label3: TLabel;
Panel1: TPanel;
img1: TImage;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
procedure Button4Click(Sender: TObject);
procedure Button5Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
begin
if opd1.Execute then begin
edit2.Text:=opd1.FileName;
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
if edit1.Text='' then begin
showmessage('Please Input Name First!');
edit1.SelectAll;
edit1.SetFocus;
exit;
end;
if edit2.Text='' then begin
showmessage('Please Choose File First!');
button1.SetFocus;
exit;
end;
with adq1 do begin
close;
sql.clear;
sql.text:= 'select * from sfis1.c_test_t where name=:nm';
Parameters.ParamByName('nm').Value:=edit1.Text;
open;
if RecordCount>0 then begin
edit;
fieldbyname('name').value:=edit1.Text;
TBlobField(fieldbyname('appendex')).LoadFromFile(edit2.Text);
post;
close;
end else begin
append;
fieldbyname('name').value:=edit1.Text;
TBlobField(adq1.fieldbyname('appendex')).LoadFromFile(edit2.Text);
post;
close;
end;
end;
edit1.Text:='';
edit2.Text:='';
showmessage('ADO SAVE OK!');
end;
procedure TForm1.Button3Click(Sender: TObject);
begin
if edit1.Text='' then begin
showmessage('Please Input Name First!');
edit1.SelectAll;
edit1.SetFocus;
exit;
end;
if edit2.Text='' then begin
showmessage('Please Choose File First!');
button1.SetFocus;
exit;
end;
with oq1 do begin
close;
sql.clear;
sql.text:= 'select * from sfis1.c_test_t where name=:nm';
parambyname('nm').AsString:=edit1.Text;
open;
if recordcount>0 then
edit
else
append;
fieldbyname('name').value:=edit1.Text;
TBlobField(fieldbyname('appendex')).LoadFromFile(edit2.Text);
post;
close;
end;
edit1.Text:='';
edit2.Text:='';
showmessage('ODAC SAVE OK!');
end;
procedure TForm1.Button4Click(Sender: TObject);
var f1:string;
begin
if edit1.Text='' then begin
showmessage('Please Input Name First!');
edit1.SelectAll;
edit1.SetFocus;
exit;
end;
if edit1.Text<>'' then begin
with adq1 do begin
close;
sql.Clear;
sql.Add('select * from sfis1.c_test_t where name=:nm');
Parameters.ParamByName('nm').Value:=edit1.Text;
Open;
if recordcount>0 then begin
f1:=extractfilepath(application.ExeName)+edit1.Text+'.JPG';
if fileexists(f1) then
deletefile(f1);
Tblobfield(fieldbyname('appendex')).SaveToFile(f1);
&nb
补充：软件开发 , Delphi ,
