unit27.~pas

本人用delphi开发的一个小型医院管理系统。

unit Unit27;

interface

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

type
  TForm27 = class(TForm)
    PageControl1: TPageControl;
    TabSheet1: TTabSheet;
    TabSheet2: TTabSheet;
    Label1: TLabel;
    Edit1: TEdit;
    Label2: TLabel;
    Edit2: TEdit;
    Button1: TButton;
    Button2: TButton;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    ADOConnection1: TADOConnection;
    ADOQuery1: TADOQuery;
    ADOQuery2: TADOQuery;
    DataSource2: TDataSource;
    Label3: TLabel;
    Edit3: TEdit;
    Button3: TButton;
    DBGrid2: TDBGrid;
    Button4: TButton;
    Button5: TButton;
    Button6: TButton;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form27: TForm27;
  Query : TADOQuery;
  aaa,yonghu,mima:Char;
implementation

{$R *.dfm}

procedure TForm27.FormCreate(Sender: TObject);
begin
    adoquery1.Close;
    adoquery1.SQL.Clear;
    adoquery1.SQL.Add('select  *  from  denglu');
    adoquery1.Open;
end;


procedure TForm27.Button1Click(Sender: TObject);
begin
if (Edit1.Text<>'') and (Edit2.text<>'')  then
 begin

   Query := TADOQuery.Create(nil);
   Query.Connection :=ADOConnection1;
   Query.SQL.Add('select yonghu from denglu  where yonghu =:aaa');
   Query.Parameters.ParamByName('aaa').Value :=edit1.Text;
   Query.Open;
   if Query.RecordCount <>0 then
   showmessage('此用户信息已存在！')
   else
   begin
    adoquery1.Open;
    adoquery1.SQL.Clear;
    adoquery1.SQL.Add('insert  into  denglu(yonghu,mima)  values(:yonghu,:mima)');
    adoquery1.Parameters.ParamByName('yonghu').Value:=Edit1.Text;
    adoquery1.Parameters.ParamByName('mima').Value:=Edit2.Text;

    adoquery1.ExecSQL;

    adoquery1.Close;
    adoquery1.SQL.Clear;
    adoquery1.SQL.Add('select  *  from  denglu');
    adoquery1.Open;

    edit1.Clear;edit2.Clear;
    showmessage('数据已经添加成功！');
   end
 end
else
  if (Edit1.Text='') then
   showmessage('请输入用户！')
else
  if (Edit2.Text='') then
   showmessage('请输入密码！');
end;


procedure TForm27.Button3Click(Sender: TObject);
begin
if (Edit3.Text<>'') then
begin
   Query := TADOQuery.Create(nil);
   Query.Connection :=ADOConnection1;
   Query.SQL.Add('select yonghu from denglu  where yonghu =:aaa');
   Query.Parameters.ParamByName('aaa').Value :=edit3.Text;
   Query.Open;
   if Query.RecordCount =0 then  //非0表示存在，0表示不存在
   showmessage('此用户信息不存在！')
   else

  begin
  adoquery2.Close;
  adoquery2.SQL.Clear;
  adoquery2.SQL.Add('select  *  from denglu where yonghu='''+edit3.Text+'''');
  adoquery2.Open;
  end
end

else
   showmessage('请输入用户名！');
end;

procedure TForm27.Button4Click(Sender: TObject);
begin
if (edit3.Text<>'') then
  begin
  adoquery2.Close;
  adoquery2.SQL.Clear;
  adoquery2.SQL.Add('delete   from  denglu where yonghu='''+edit3.Text+'''');
  adoquery2.ExecSQL;

  adoquery1.Close;
  adoquery1.SQL.Clear;
  adoquery1.SQL.Add('select  *  from  denglu');
  adoquery1.Open;

  showmessage('数据已经删除成功！');
  end

end;

procedure TForm27.Button5Click(Sender: TObject);
begin
  adoquery2.Post;

  adoquery1.Close;
  adoquery1.SQL.Clear;
  adoquery1.SQL.Add('select  *  from  denglu');
  adoquery1.Open;

  showmessage('数据已经修改成功！');
end;

procedure TForm27.Button2Click(Sender: TObject);
begin
form27.Close;
end;

procedure TForm27.Button6Click(Sender: TObject);
begin
form27.Close;
end;

end.