captureprice_unit.pas

学校班级教学管理系统 DELPHI7下的

unit CapturePrice_Unit;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, Base_Unit, StdCtrls, Buttons, DBCtrls, Grids, DBGrids, ComCtrls,
  ExtCtrls, Mask, DB, Menus, StdActns, ActnList;

type
  TfrmCapturePrice = class(TfrmBase)
    Panel1: TPanel;
    PageControl1: TPageControl;
    TabSheet1: TTabSheet;
    Panel2: TPanel;
    DBGrid1: TDBGrid;
    Panel3: TPanel;
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    cmbxClassName: TDBLookupComboBox;
    cmbxStudentID: TDBLookupComboBox;
    edtRemark: TDBMemo;
    btnAdd: TBitBtn;
    btnModify: TBitBtn;
    btnDel: TBitBtn;
    btnSave: TBitBtn;
    btnCancel: TBitBtn;
    TabSheet2: TTabSheet;
    Panel4: TPanel;
    Label14: TLabel;
    Label15: TLabel;
    Label16: TLabel;
    cmbxItems: TComboBox;
    cmbxCondition: TComboBox;
    cmbxValues: TComboBox;
    btnFind: TBitBtn;
    Panel5: TPanel;
    cmbxPriceName: TDBComboBox;
    edtPrice: TDBEdit;
    DataPrice: TDataSource;
    DataClassName: TDataSource;
    DataStudentID: TDataSource;
    DBGrid2: TDBGrid;
    DataFindPrice: TDataSource;
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure FormCreate(Sender: TObject);
    procedure btnFindClick(Sender: TObject);
    procedure btnAddClick(Sender: TObject);
    procedure btnModifyClick(Sender: TObject);
    procedure btnCancelClick(Sender: TObject);
    procedure btnDelClick(Sender: TObject);
    procedure btnSaveClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  frmCapturePrice: TfrmCapturePrice;

implementation

uses Common_Unit, DM_Unit;

{$R *.dfm}

procedure TfrmCapturePrice.FormClose(Sender: TObject;
  var Action: TCloseAction);
begin
  inherited;
  frmCapturePrice := nil;
end;

procedure TfrmCapturePrice.FormCreate(Sender: TObject);
var
  SQLPrice, SQLClassName, SQLDormID, SQLStudentID: string;
begin
  inherited;
  SQLPrice := 'Select * From Price';
  DataPrice.DataSet := SQLDataSet(SQLPrice,DM.ADOConn);   //连接数据库

  SQLClassName := 'Select * From ClassInfo';
  DataClassName.DataSet := SQLDataSet(SQLClassName,DM.ADOConn);

  SQLStudentID := 'Select * From StudentInfo';
  DataStudentID.DataSet := SQLDataSet(SQLStudentID,DM.ADOConn);
end;

procedure TfrmCapturePrice.btnFindClick(Sender: TObject);
var
  SQL: string;
begin
  inherited;
  if cmbxItems.ItemIndex = 0 then
    SQL := 'Select B.* From StudentInfo A, Price B ' +
          'where A.StudentID=B.StudentID and A.StudentID ' +
          cmbxCondition.Text + Quotedstr(cmbxValues.Text);

  if cmbxItems.ItemIndex = 1 then
  begin
    SQL := 'Select B.* From StudentInfo A, Price B ' +
          'where A.StudentID=B.StudentID and A.StuName '
          + cmbxCondition.Text + Quotedstr(cmbxValues.Text);
    if cmbxCondition.Text = 'Like' then
      SQL := 'Select B.* From StudentInfo A, Price B ' +
            'where A.StudentID=B.StudentID and A.StuName '
            + cmbxCondition.Text + Quotedstr('%' + cmbxValues.Text + '%');
  end;
  if SQL <> '' then
    DataFindPrice.DataSet := SQLDataSet(SQL,DM.ADOConn);
end;

procedure TfrmCapturePrice.btnAddClick(Sender: TObject);
begin
  inherited;
  DataPrice.DataSet.Insert;
end;

procedure TfrmCapturePrice.btnModifyClick(Sender: TObject);
begin
  inherited;
  DataPrice.DataSet.Edit;
end;

procedure TfrmCapturePrice.btnCancelClick(Sender: TObject);
begin
  inherited;
  DataPrice.DataSet.Cancel;
end;

procedure TfrmCapturePrice.btnDelClick(Sender: TObject);
begin
  inherited;
  if Application.MessageBox('确定要删除此条记录?','提示',68) = IDNo then
    Exit;
  DataPrice.DataSet.Delete;                          
end;

procedure TfrmCapturePrice.btnSaveClick(Sender: TObject);
begin
  inherited;
  if DataPrice.State in [dsInsert,dsEdit] then          //判断状态,只有在添加或是修改的时候才能保存信息
    DataPrice.DataSet.Post;
end;

end.