unit6.pas

一个可以用于书店的图书信息管理系统

unit Unit6;

interface

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

type
  TForm7 = class(TForm)
    Image1: TImage;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Panel1: TPanel;
    CheckBox1: TCheckBox;
    DBGrid1: TDBGrid;
    ADOQuery1: TADOQuery;
    DataSource1: TDataSource;
    Label4: TLabel;
    Button1: TButton;
    Button2: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form7: TForm7;

implementation

uses Unit8, Unit3, Unit2;

{$R *.dfm}

procedure TForm7.FormCreate(Sender: TObject);
begin
adoquery1.close;
end;

procedure TForm7.Button1Click(Sender: TObject);
Var
S_sql:string;
begin
 adoquery1.Close;
 adoquery1.SQL.Clear;
 S_sql:='select * from 读者信息 where 1=1';

  if edit1.Text<>''then   begin
  if checkbox1.Checked then
  S_sql:=S_sql+'and 读者编号 like ''%'+edit1.text+'%'''
  else
  S_sql:=S_sql+'and 读者编号='''+edit1.text+'''';
   end;
  if edit2.Text<>'' then  begin
  if checkbox1.Checked then
  S_sql:=S_sql+'and 读者姓名 like ''%'+edit1.Text+'%'''
  else
  S_sql:=S_sql+'and 读者姓名 ='''+edit1.Text+'''';
  end;
   if edit3.Text<>'' then    begin
  if checkbox1.Checked then
  S_sql:=S_sql+'and 系别 like ''%'+edit1.Text+'%'''
  else
  S_sql:=S_sql+'and 系别 ='''+edit1.Text+'''';
  end;
  adoquery1.sql.add(S_sql);
  adoquery1.open;
  edit1.text:='';
  edit2.text:='';
  edit3.text:='';
  if adoquery1.recordcount=0 then
  begin
  adoquery1.Close;
  Application.MessageBox('没有该学生的记录','提示信息',mb_ok);
end;
end;
procedure TForm7.Button2Click(Sender: TObject);
begin
form7.close;
form2.show;
end;



end.