unit7.~pas

用delphi写的课堂作业

unit Unit7;

interface

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

type
  TFrame7 = class(TFrame)
    DBGrid1: TDBGrid;
    DBMemo1: TDBMemo;
    Button1: TButton;
    DataSource1: TDataSource;
    ADOQuery1: TADOQuery;
    Edit1: TEdit;
    Button2: TButton;
    Button3: TButton;
    Label2: TLabel;
    Button4: TButton;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure Label1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

implementation

{$R *.dfm}

procedure TFrame7.Button1Click(Sender: TObject);
var
 tiaojian:string;
begin
  if Edit1.Text<>'' then
  begin
    tiaojian := 'select * from student where sname like "%' + Edit1.Text + '%" or number like "%'+Edit1.Text+'%"or grade like "%'+Edit1.Text+'%" or sex like "%'+Edit1.Text+'%"';
    ADOQuery1.Close;
    ADOQuery1.SQL.Clear;
    ADOQuery1.SQL.Add(tiaojian);
    ADOQuery1.Open;
  end
  else
    messagebox(handle,'请输入查询条件！','检查输入',mb_iconwarning+mb_ok)
end;

procedure TFrame7.Label1Click(Sender: TObject);
var
xianshi:string;
begin
  xianshi := 'select * from student';
  ADOQuery1.Close;
  ADOQuery1.SQL.Clear;
  ADOQuery1.SQL.Add(xianshi);
  ADOQuery1.Open;
end;

procedure TFrame7.Button2Click(Sender: TObject);
begin
button3.Enabled:=true;
button2.Enabled:=false;
DBmemo1.ReadOnly:=false;
DBmemo1.Color:=clWhite;
ADOQuery1.Edit;
end;

procedure TFrame7.Button3Click(Sender: TObject);
begin
button2.Enabled:=true;
button3.Enabled:=false;
ADOQuery1.Post;
DBmemo1.ReadOnly:=true;
DBmemo1.Color:=clSilver;
application.MessageBox('信息已保存','确定');
end;

end.