main.~pas

Delphi7数据库开发教程,包含该书21套实例

unit Main;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DB, DBTables, Grids, DBGrids, StdCtrls;

type
  TForm1 = class(TForm)
    DBGrid1: TDBGrid;
    DataSource1: TDataSource;
    Query1: TQuery;
    btnOrder: TButton;
    edtEmpNo: TEdit;
    Label1: TLabel;
    procedure btnOrderClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.btnOrderClick(Sender: TObject);
begin
  with Query1 do
  begin
    Close;
    //将SQL语句赋值给ADOQry的SQL属性
    SQL.Clear;
    SQL.Add('select * from employee where empno = :no');
    ParamByName('no').AsInteger := StrToInt(edtEmpNo.Text);
    Open;
  end;
end;

end.