小弟刚学delphi,写了些代码出现了问题。麻烦高手帮忙看下 以下代码哪里出错了呢?procedure TForm1.Button4Click(Sender: TObject);
var user,pass,uname:string;
begin
user:=username.Text;
pass:=pwd.Text;
ADOQuery1.Close;
ADOQuery1.SQL.Clear;
ADOQuery1.SQL.Text:='select username from tb_members where username='''+user+'''and password='''+pass+'''';
ADOQuery1.Open;
uname:=ADOQuery1.FieldByName('username').AsString;
showmessage(uname);
end;end.
var user,pass,uname:string;
begin
user:=username.Text;
pass:=pwd.Text;
ADOQuery1.Close;
ADOQuery1.SQL.Clear;
ADOQuery1.SQL.Text:='select username from tb_members where username='''+user+'''and password='''+pass+'''';
ADOQuery1.Open;
uname:=ADOQuery1.FieldByName('username').AsString;
showmessage(uname);
end;end.
begin
user:=username.Text;
pass:=pwd.Text;
ADOQuery1.Close;
ADOQuery1.SQL.Clear;
ADOQuery1.SQL.Text:='select username from tb_members where username='''+user+'''and password='''+pass+'''';
ADOQuery1.Open;
if not ADOQuery1.IsEmpty then
begin
uname:=ADOQuery1.FieldByName('username').AsString;
showmessage(uname);
end
else
begin
showmessage('no data found.');
end;
end;end.