向下选中N条

方法1：单击事件写法

procedure TForm3.N24Click(Sender: TObject);
var
  Atiao:string;
  I: Integer;
//begin
begin
   //获取N值
  if not InputQuery('输入条数', '需选择条数', Atiao) then
  begin
    ShowMessage('请输入选择条数N值');
    Exit;
  end;
//向下选中N条，循环N次修改选中的值为真；
 begin
  for I := 1 to Atiao.ToInteger do
  begin
    with frmDataPool.qry需要做的事 do
    begin
    Edit;
    FieldByName('选中').AsBoolean := True;
    Post;
    Next;
    end;
  end;
 end;
end;

方法2：类写法

unit USelectDownNRec;

interface
uses  FDataPool, Data.DB, Data.Win.ADODB, Vcl.Menus,  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.ComCtrls,
  Vcl.ExtCtrls, Vcl.DBCtrls, Vcl.Grids, Vcl.DBGrids, Clipbrd,
  Vcl.StdCtrls;
/// <summary>
/// 向下选中N条 ，循环N次修改选中的值为真；
/// </summary>
type TSelectDownNRec =class
  public
  class procedure selectnrecord (var SAdq:TADOQuery);
end;

implementation
  class procedure TSelectDownNRec.selectnrecord(var SAdq: TADOQuery);
 var
  Atiao:string;
  I: Integer;
begin
   //获取N值
  if not InputQuery('输入条数', '需选择条数', Atiao) then
  begin
    ShowMessage('请输入选择条数N值');
    Exit;
  end;
//向下选中N条，循环N次修改选中的值为真；
 begin
  for I := 1 to Atiao.ToInteger do
  begin
    with SAdq do
    begin
    Edit;
    FieldByName('选中').AsBoolean := True;
    Post;
    Next;
    end;
  end;
 end;
end;

end.

类引用方法：（哪个单元需要使用要先引用定义的类单元：如在uses 语句里面添加 USelectDownNRec;）

然后按下方方法调用即可：

procedure TForm3.N24Click(Sender: TObject);
begin
TSelectDownNRec.selectnrecord(frmDataPool.qry需要做的事);
end;