unit12.~pas

来自「一个可以用于书店的图书信息管理系统」· ~PAS 代码 · 共 85 行

unit Unit12;

interface

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

type
  TForm12 = class(TForm)
    Image1: TImage;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    ADOQuery1: TADOQuery;
    DataSource1: TDataSource;
    CheckBox1: TCheckBox;
    BitBtn1: TBitBtn;
    BitBtn2: TBitBtn;
    DBGrid1: TDBGrid;
    procedure BitBtn2Click(Sender: TObject);
    procedure BitBtn1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form12: TForm12;

implementation

uses Unit2;

{$R *.dfm}

procedure TForm12.BitBtn2Click(Sender: TObject);
begin
close;
form2.show;
end;

procedure TForm12.BitBtn1Click(Sender: TObject);
Var
s_sql:string;
begin
  adoquery1.Close;
  adoquery1.SQL.clear;
  s_sql:='select * from 图书信息 where 1=1';
  if not checkbox1.Checked then
  begin
  if edit1.text<>'' then
  s_sql:=s_sql+'and 图书编号='''+edit1.text+'''';
  if edit2.text<>'' then
  s_sql:=s_sql+'and 图书名称='''+edit2.text+'''';
  if edit3.text<>'' then
  s_sql:=s_sql+'and 作者='''+edit3.text+'''';
end
  else
  begin
   if edit1.text<>'' then
  s_sql:=s_sql+'and 图书编号 like ''%'+edit1.text+'%''';
  if edit2.text<>'' then
  s_sql:=s_sql+'and 图书名称 like ''%'+edit2.text+'%''';
  if edit3.text<>'' then
  s_sql:=s_sql+'and 作者 like ''%'+edit3.text+'%''';
  end;
  adoquery1.sql.add(s_sql);
  adoquery1.Open;
  if adoquery1.RecordCount=0 then
  application.MessageBox('找不到该图书记录，请查看自己的查询条件！','图书管理系统-提示信息',mb_ok);
  end;

procedure TForm12.FormCreate(Sender: TObject);
begin
adoquery1.Close;
end;

end.