c_table.pas

《delphi数据库设计与实例开发》随书光盘

unit c_table;

interface

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

type
  Tcfrm_table = class(TForm)
    ToolBar1: TToolBar;
    TButton1: TToolButton;
    TButton2: TToolButton;
    TButton3: TToolButton;
    ToolButton7: TToolButton;
    TButton5: TToolButton;
    TButton6: TToolButton;
    ToolButton4: TToolButton;
    TButton8: TToolButton;
    DBNavigator1: TDBNavigator;
    Panel1: TPanel;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    DBEdit1: TDBEdit;
    DBGrid2: TDBGrid;
    StatusBar1: TStatusBar;
    DataSource1: TDataSource;
    ImageList1: TImageList;
    DBComboBox1: TDBComboBox;
    DBComboBox2: TDBComboBox;
    procedure FormCreate(Sender: TObject);
    procedure TButton1Click(Sender: TObject);
    procedure TButton2Click(Sender: TObject);
    procedure DataSource1DataChange(Sender: TObject; Field: TField);
    procedure TButton5Click(Sender: TObject);
    procedure TButton6Click(Sender: TObject);
    procedure TButton3Click(Sender: TObject);
  private
    { Private declarations }
  public
  procedure cpsl;
    { Public declarations }
  end;

var
  cfrm_table: Tcfrm_table;
  tablecount:integer;

implementation

uses c_datam, publicvar;

{$R *.dfm}
procedure tcfrm_table.cpsl;
begin
   tablecount:=dm.ADO_table.RecordCount;
   StatusBar1.Panels[0].text:='当前的桌位总数为：'+inttostr(tablecount);
end;

procedure Tcfrm_table.FormCreate(Sender: TObject);
begin
  StatusBar1.Panels[1].Text:=datetostr(date())+'|'+username;
  dm.ADO_table.Open;
  dm.ADO_table.Sort:='table_id';
  dm.ADO_table.First;
end;

procedure Tcfrm_table.TButton1Click(Sender: TObject);
begin
  dm.ADO_table.Append;
  TButton5.Tag:=0;
  TButton1.Enabled:=false;
  TButton2.Enabled:=false;
  TButton3.Enabled:=false;
  TButton5.Enabled:=true;
  TButton6.Enabled:=true;
  DBCombobox1.Text:='';
  DBCombobox1.Enabled:=true;
  DBEdit1.Enabled:=true;
  DBCombobox2.Enabled:=true;
end;

procedure Tcfrm_table.TButton2Click(Sender: TObject);
var
 tableid,mes:string;
begin
 tableid:=dm.ADO_table.fieldbyname('table_id').asstring;
 dm.ado_meals.open;
 dm.ado_meals.first;
 if dm.ado_meals.locate('table_id',tableid,[]) then
  begin
      mes:='桌位： <'+dm.ADO_table.fieldbyname('table_id').AsString
           +'> 已有顾客，不能修改！';
      application.MessageBox(pchar(mes),pchar('提示')
       ,+MB_ICONQUESTION);
       dm.ado_meals.close;
      exit;
  end
  else
  begin
  dm.ado_meals.close;
  TButton5.Tag:=1;
  TButton1.Enabled:=false;
  TButton2.Enabled:=false;
  TButton3.Enabled:=false;
  TButton5.Enabled:=true;
  TButton6.Enabled:=true;
  DBCombobox1.Enabled:=true;
  DBEdit1.Enabled:=true;
  DBCombobox2.Enabled:=true;
  end;

end;

procedure Tcfrm_table.DataSource1DataChange(Sender: TObject;
  Field: TField);
begin
DBCombobox1.Text:=dm.ADO_table.fieldbyname('table_type').AsString;
DBCombobox2.Text:=dm.ADO_table.fieldbyname('table_state').AsString;
end;

procedure Tcfrm_table.TButton5Click(Sender: TObject);
begin
if Length(DBEdit1.Text)<3 then  //判断输入的桌位号是否合法
    begin
      Application.MessageBox(PChar('桌位不能为空或小于3位,请重新录入！')
      , PChar('提示'),MB_ICONEXCLAMATION);
      DBEdit1.SetFocus();
      exit;
     end;
  if DBCombobox1.Text='' then  //判断是否输入了类型
    begin
      Application.MessageBox(PChar('类型不能为空,请重新录入！')
      , PChar('提示'),MB_ICONEXCLAMATION);
      DBCombobox1.SetFocus();
      exit;
     end;
  if TButton5.Tag=1 then dm.ADO_table.Edit;
  try
   dm.ADO_table.Post;
  except
    Application.MessageBox(PChar('桌位编号重复,请重新录入！'), PChar('提示'),
      MB_ICONEXCLAMATION);
    DBEdit1.SetFocus();
    exit;
  end;
  TButton1.Enabled:=true;
  TButton2.Enabled:=true;
  TButton3.Enabled:=true;
  TButton5.Enabled:=false;
  TButton6.Enabled:=false;
  DBCombobox1.Enabled:=false;
  DBEdit1.Enabled:=false;
 DBCombobox2.Enabled:=false;
  cpsl;
end;

procedure Tcfrm_table.TButton6Click(Sender: TObject);
begin
 dm.ADO_table.Cancel;
 TButton1.Enabled:=true;
  TButton2.Enabled:=true;
  TButton3.Enabled:=true;
  TButton5.Enabled:=false;
  TButton6.Enabled:=false;
  DBCombobox1.Enabled:=false;
  DBEdit1.Enabled:=false;
 DBCombobox2.Enabled:=false;
end;

procedure Tcfrm_table.TButton3Click(Sender: TObject);
var tableid,mes:string;
begin
 tableid:=dm.ADO_table.fieldbyname('table_id').asstring;
 dm.ado_meals.open;
 dm.ado_meals.first;
 if dm.ado_meals.locate('table_id',tableid,[]) then
  begin
      mes:='桌位： <'+dm.ADO_table.fieldbyname('table_id').AsString
           +'> 已有顾客，不能修改！';
      application.MessageBox(pchar(mes),pchar('提示')
       ,+MB_ICONQUESTION);
       dm.ado_meals.close;
      exit;
  end;
   mes:='是否要删除桌位< '+dm.ADO_table.fieldbyname('table_id').AsString +'>';
 if application.MessageBox(pchar(mes),pchar('等待确认')
    ,+MB_ICONQUESTION+mb_okcancel+MB_DEFBUTTON2)=idok then
     begin
      dm.ADO_table.Delete;//删除桌位记录
      cpsl;
     end;
end;

end.