chosecountclass.cpp

教学管理系统

// ChoseCountClass.cpp : implementation file
//

#include "stdafx.h"
#include "COdbc.h"
#include "ChoseCountClass.h"
#include <afxdb.h>
#include "ChoseCourse.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CChoseCountClass dialog


CChoseCountClass::CChoseCountClass(CWnd* pParent /*=NULL*/)
	: CDialog(CChoseCountClass::IDD, pParent)
{
	//{{AFX_DATA_INIT(CChoseCountClass)
	m_class = _T("");
	m_result = _T("");
	//}}AFX_DATA_INIT
}


void CChoseCountClass::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CChoseCountClass)
	DDX_Text(pDX, IDC_EDIT1, m_class);
	DDX_Text(pDX, IDC_EDIT2, m_result);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CChoseCountClass, CDialog)
	//{{AFX_MSG_MAP(CChoseCountClass)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CChoseCountClass message handlers

void CChoseCountClass::OnOK() 
{
	// TODO: Add extra validation here
	
	CDatabase db;
	BOOL bRtn;
	CString sql,tmp;
	try {
	bRtn = db.OpenEx("DSN=教学管理系统;UID=sa", CDatabase::noOdbcDialog);
	}catch (CDBException *pDBEx) {
	pDBEx->ReportError();
	}catch (CMemoryException *pMemEx) {
	pMemEx->ReportError();
	}
	if (!bRtn)
	printf("连接数据库失败!");

	UpdateData(true);
	sql="select count(*) from student where class='";
	sql+=m_class;
	sql+="' and student_id in ";
	sql+="(select student_id from student_lesson)";
	CChoseCourse rs(&db);
	try {
	bRtn = rs.Open(CRecordset::snapshot,sql);
	} catch(CDBException *pDBEx) {
	pDBEx->ReportError();
	} catch(CMemoryException *pMemEx) {
	pMemEx->ReportError();
	}
	if(!bRtn) {
	AfxMessageBox("Query table failed!",MB_OK|MB_ICONERROR);
	return ;
	}
	/* 4、逐条获取查询结果*/
	for(rs.MoveFirst();!rs.IsEOF();rs.MoveNext()) {
	// TODO: Add code here
	}
	/* 5、关闭记录集、数据库*/
	m_result=rs.m_student_id;
	UpdateData(false);
	rs.Close();
	db.Close();
}

void CChoseCountClass::OnCancel() 
{
	// TODO: Add extra cleanup here
	
	CDialog::OnCancel();
}