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, ExtCtrls, DB, DBTables, ComCtrls, StdCtrls, Grids, DBGrids;

type
  TForm1 = class(TForm)
    GroupBox1: TGroupBox;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Edit4: TEdit;
    Edit5: TEdit;
    Panel1: TPanel;
    Button1: TButton;
    Button2: TButton;
    StatusBar1: TStatusBar;
    Button3: TButton;
    Query1: TQuery;
    Timer1: TTimer;
    Panel2: TPanel;
    Query2: TQuery;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    procedure Timer1Timer(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Timer1Timer(Sender: TObject);
begin
   StatusBar1.Panels[1].Text:=datetostr(date())+'  '+timetostr(time());
end;

procedure TForm1.Button2Click(Sender: TObject);
var i:integer;
begin
    for i:=ComponentCount-1 downto 1 do
    begin
      if (components[i] is Tedit) then
         begin
         (components[i] as tedit).Text:='';
         end;
    end;
    edit1.SetFocus;
    button1.Enabled:=false;
end;

procedure TForm1.Button1Click(Sender: TObject);
var i:integer;
begin
  with query1 do
    begin
    sql.Clear;
    sql.Add('insert into country ');
    sql.Add('values(:x1,:x2,:x3,:x4,:x5)');
    ParamByName('x1').AsString:=edit1.Text;
    ParamByName('x2').AsString:=edit2.Text;
    ParamByName('x3').AsString:=edit3.Text;
    ParamByName('x4').AsFloat:=strtofloat(edit4.Text);
    ParamByName('x5').AsFloat:=strtofloat(edit5.Text);
    Prepare;
    ExecSQL;
    end;
    showmessage('数据已经插入');
    for i:=ComponentCount-1 downto 1 do
    begin
      if (components[i] is Tedit) then
         begin
         (components[i] as tedit).Text:='';
         end;
    end;
    edit1.SetFocus;
    button1.Enabled:=true;
    with query2 do
     begin
      close;
      open;
     end;

end;

end.