unit1.pas

一系列DELPHI的控件如何使用的例子,例子有的比较简单,但是能详细的说明了控件的使用,对许多刚涉足DELPHI的朋友会很有帮助的

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, Buttons, DB, DBTables, DBCtrls, Mask, Grids, DBGrids,
  ExtCtrls, ComCtrls;

type
  TForm1 = class(TForm)
    PageControl1: TPageControl;
    TabSheet1: TTabSheet;
    TabSheet2: TTabSheet;
    Panel1: TPanel;
    DBGrid1: TDBGrid;
    Panel2: TPanel;
    GroupBox1: TGroupBox;
    DBEdit1: TDBEdit;
    DBEdit2: TDBEdit;
    DBEdit3: TDBEdit;
    DBEdit4: TDBEdit;
    DBEdit5: TDBEdit;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    DBNavigator1: TDBNavigator;
    Table1: TTable;
    DataSource1: TDataSource;
    BitBtn1: TBitBtn;
    BitBtn2: TBitBtn;
    BitBtn3: TBitBtn;
    BitBtn4: TBitBtn;
    BitBtn5: TBitBtn;
    BitBtn6: TBitBtn;
    BitBtn7: TBitBtn;
    ComboBox1: TComboBox;
    Label6: TLabel;
    procedure BitBtn1Click(Sender: TObject);
    procedure BitBtn2Click(Sender: TObject);
    procedure BitBtn3Click(Sender: TObject);
    procedure BitBtn4Click(Sender: TObject);
    procedure BitBtn5Click(Sender: TObject);
    procedure BitBtn6Click(Sender: TObject);
    procedure BitBtn7Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure ComboBox1Change(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.BitBtn1Click(Sender: TObject);
begin
   if not table1.Bof then
      table1.First
   else
      showmessage('已是首记录');
end;

procedure TForm1.BitBtn2Click(Sender: TObject);
begin
   if not table1.Bof then
      table1.Prior
   else
      showmessage('已是首记录');
end;

procedure TForm1.BitBtn3Click(Sender: TObject);
begin
   if not table1.Eof then
      table1.Next
   else
      showmessage('已是尾记录');
end;

procedure TForm1.BitBtn4Click(Sender: TObject);
begin
   if not table1.Eof then
      table1.Last
   else
      showmessage('已是尾记录');

end;

procedure TForm1.BitBtn5Click(Sender: TObject);
begin
   table1.Edit;
end;

procedure TForm1.BitBtn6Click(Sender: TObject);
begin
   if table1.State in [dsedit,dsinsert] then
   table1.Post;
end;

procedure TForm1.BitBtn7Click(Sender: TObject);
begin
   table1.Delete;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
    with combobox1 do
    begin
     items.Clear;
     table1.First;
     while not table1.Eof do
       begin
       items.Add(table1.fieldbyname('name').AsString);
       table1.next;
       end;
       itemindex:=0;
    end;
    table1.First;

end;

procedure TForm1.ComboBox1Change(Sender: TObject);
begin
   with table1 do
   begin
     editkey;
     fieldbyname('name').AsString:=combobox1.Text;
     gotokey;
   end;
end;

end.