unit1.pas

来自「Delphi函数参考大全的CD」· PAS 代码 · 共 54 行

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, DB, ADODB, Math;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Student: TEdit;
    ADOConnection1: TADOConnection;
    ADOQuery1: TADOQuery;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  yw,xs,yy,temp: Integer;
begin
  With ADOQuery1 do
  begin
    Close;
    SQL.Clear;
    SQL.Add('select 语文,数学,英语 from 学生成绩表 where 姓名 = :name');
    Parameters.ParamByName('name').Value := Student.Text;
    Open;
  end;
  if ADOQuery1.RecordCount>0 then
  begin
    yw := ADOQuery1.FieldByName('语文').Value;
    xs := ADOQuery1.FieldByName('数学').Value;
    yy := ADOQuery1.FieldByName('英语').Value;
    temp := Min(yw,xs);
    temp := Min(temp,yy);
    ShowMessage('该学生的最低成绩为 '+ IntToStr(temp));
  end;
end;


end.