unit6.pas

学生信息管理系统

unit Unit6;

interface

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

type
  TForm3 = class(TForm)
    GroupBox1: TGroupBox;
    GroupBox2: TGroupBox;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    Label6: TLabel;
    Label7: TLabel;
    Label8: TLabel;
    Button1: TButton;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Edit4: TEdit;
    Edit5: TEdit;
    Edit6: TEdit;
    ComboBox1: TComboBox;
    ComboBox2: TComboBox;
    DBGrid1: TDBGrid;
    StatusBar1: TStatusBar;
    procedure Button1Click(Sender: TObject);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form3: TForm3;

implementation

uses Unit1;

{$R *.dfm}

procedure TForm3.Button1Click(Sender: TObject);
var
    sqlstr:string;
begin
    sqlstr:='select * from dangan where (1=1)';
    if edit1.Text <>'' then
    sqlstr:=sqlstr+'and (姓名='''+edit1.text+''')';
    if edit2.text<>'' then
    sqlstr:=sqlstr+'and (学号='''+edit2.text+''')';
    if combobox1.Text<>'' then
    sqlstr:=sqlstr+'and (性别='''+combobox1.text+''')' ;
    if combobox2.Text <>'' then
    sqlstr:=sqlstr+'and (党团员='''+combobox2.text+''')' ;
    if  edit3.text<>'' then
    sqlstr:=sqlstr+'and (院系='''+edit3.text+''')';
    if edit4.text<>'' then
    sqlstr:=sqlstr+'and (籍贯='''+edit4.text+''')';
    if edit5.text<>'' then
    sqlstr:=sqlstr+'and (专业='''+edit5.text+''')';
    if edit6.text<>'' then
    sqlstr:=sqlstr+'and (电话号码='''+edit6.text+''')';
    dm.ADOQuery1.Close ;
    dm.ADOQuery1.SQL.Clear ;
    dm.ADOQuery1.SQL.Add(sqlstr);
    dm.ADOQuery1.Open ;
    Edit1.Text:='';
    Edit2.Text:='';
    Edit3.Text:='';
    Edit4.Text:='';
    Edit5.Text:='';
    Edit6.Text:='';
    combobox1.Text:='';
    combobox2.Text:='';
    statusbar1.Panels[0].Text:='总共找到 '+inttostr(dm.ADOQuery1.RecordCount)+' 条记录';
end;

procedure TForm3.FormClose(Sender: TObject; var Action: TCloseAction);
begin
    action:=cafree;
end;

procedure TForm3.FormCreate(Sender: TObject);
begin
    dm.ADOConnection1.close;
    dm.ADOConnection1.Open;
    try
        dm.ADOConnection1.Open;
    except
        application.MessageBox('找不到数据库，引起该问题的原因是数据库文件可能被人为删除或改名.','无法打开数据库',0);
        application.Terminate;
  end;
end;

end.