changunit.pas

用Delphi做的一个学生数据库系统

unit changUnit;

interface

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

type
  Tchangfrom = class(TForm)
    Panel1: TPanel;
    Label2: TLabel;
    DateTimePicker1: TDateTimePicker;
    Button1: TButton;
    Button2: TButton;
    GroupBox1: TGroupBox;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    Label6: TLabel;
    Label7: TLabel;
    Edit2: TEdit;
    Edit3: TEdit;
    Edit4: TEdit;
    Edit5: TEdit;
    Edit6: TEdit;
    GroupBox3: TGroupBox;
    Memo1: TMemo;
    Edit_xuehao: TEdit;
    Label1: TLabel;
    Button3: TButton;
    DBGrid_change: TDBGrid;
    Label8: TLabel;
    Edit_number: TEdit;
    RadioGroup1: TRadioGroup;
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure Button3Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Edit_xuehaoKeyPress(Sender: TObject; var Key: Char);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  changfrom: Tchangfrom;
  
implementation

uses MainUnit, dm;

{$R *.dfm}

procedure Tchangfrom.FormClose(Sender: TObject; var Action: TCloseAction);
begin

action:=cafree;
mainform.tb_change.Down:=false;
end;

procedure Tchangfrom.Button3Click(Sender: TObject);     //查询
 var
 str:string;
begin
   if Edit_xuehao.Text='' then
   begin
   DBGrid_change.Visible:=false;
   Application.MessageBox('学号不能为空!','提示',64)
   end
   else
   begin
    DBGrid_change.Visible:=true;
    str:='select 学号,姓名,性别,出生日期,student.班级编号,籍贯,班主任  from student,class where student.班级编号=class.班级编号 and 学号='+Edit_xuehao.Text;
    dmform.ADOQuery_stu.Close;
    dmform.ADOQuery_stu.SQL.Clear;
    dmform.ADOQuery_stu.SQL.Add(str);
    dmform.ADOQuery_stu.Open;

    edit2.Text:=dmform.ADOQuery_stu.FieldByName('姓名').AsString;
    edit3.Text:=dmform.ADOQuery_stu.FieldByName('性别').AsString;
    edit4.Text:=dmform.ADOQuery_stu.FieldByName('出生日期').AsString;
    edit5.Text:=dmform.ADOQuery_stu.FieldByName('班级编号').AsString;
    edit6.Text:=dmform.ADOQuery_stu.FieldByName('班主任').AsString;
    with dmform.ADOQuery_change do
          begin
             close;
             SQL.Clear;
             SQL.Add('select * from change where 学号='+Edit_xuehao.Text);
             open;
          end;
    end;
end;

procedure Tchangfrom.Button1Click(Sender: TObject);    //保存
var
str:string;
begin
  if Edit_xuehao.Text=''  then
   begin
   DBGrid_change.Visible:=false;
   Application.MessageBox('学号不能为空!','提示',64)
   end
   else
   begin
  str:='insert into change(记录号,学号,学籍变更类型,记录日期,说明) values (:a,:b,:c,:d,:e)';
  dmform.ADOQuery_change.Close;
  dmform.ADOQuery_change.SQL.Clear;
  dmform.ADOQuery_change.SQL.Add(str);
  dmform.ADOQuery_change.Parameters[0].Value:=Trim(Edit_number.Text); // 记录号
  dmform.ADOQuery_change.Parameters[1].Value:=Trim(Edit_xuehao.Text);//学号
  dmform.ADOQuery_change.Parameters[3].Value:=DateTimePicker1.DateTime;//记录日期
  dmform.ADOQuery_change.Parameters[4].Value:=Memo1.Lines.Text; //说明
  case RadioGroup1.ItemIndex of
    0:dmform.ADOQuery_change.Parameters[2].Value:=RadioGroup1.Items.Strings[0];            //学籍变更类型
    1:dmform.ADOQuery_change.Parameters[2].Value:=RadioGroup1.Items.Strings[1];
    2:dmform.ADOQuery_change.Parameters[2].Value:=RadioGroup1.Items.Strings[2];
    3:dmform.ADOQuery_change.Parameters[2].Value:=RadioGroup1.Items.Strings[3];
    4:dmform.ADOQuery_change.Parameters[2].Value:=RadioGroup1.Items.Strings[4];
    5:dmform.ADOQuery_change.Parameters[2].Value:=RadioGroup1.Items.Strings[5];
  else ;
  end;
   dmform.ADOQuery_change.ExecSQL;
   Application.MessageBox('保存成功!','提示',64)
   end;
end;

procedure Tchangfrom.Button2Click(Sender: TObject);
begin
close;
end;

procedure Tchangfrom.Edit_xuehaoKeyPress(Sender: TObject; var Key: Char);
var
m:boolean;                                                     //只允许输入数字
begin
    m:=(key<#8)or(key>#8)and(key<#48)or(key>#57);
    if m then
    key:=#0;
end;

end.