myoledbset.h

拥有检测数据库是否连接成功的功能,以及第一个记录,前一个记录,下一个记录,以及最后一个的记录的检测以及显示功能.适合初学者.

// MyOleDBSet.h : interface of the CMyOleDBSet class
//
/////////////////////////////////////////////////////////////////////////////

#if !defined(AFX_MYOLEDBSET_H__D4D37F47_845C_40CE_BB1A_58ECD4B40E99__INCLUDED_)
#define AFX_MYOLEDBSET_H__D4D37F47_845C_40CE_BB1A_58ECD4B40E99__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

class CStudent
{
public:
	CStudent()
	{
		memset( (void*)this, 0, sizeof(*this) );
	};

	int m_ID;
	wchar_t m_name[26];
	int m_number;


BEGIN_COLUMN_MAP(CStudent)
		COLUMN_ENTRY_TYPE(1, DBTYPE_I4, m_ID)
		COLUMN_ENTRY_TYPE(2, DBTYPE_WSTR, m_name)
		COLUMN_ENTRY_TYPE(3, DBTYPE_I4, m_number)
END_COLUMN_MAP()

};

class CMyOleDBSet : public CCommand<CAccessor<CStudent> >
{
public:

	HRESULT Open()
	{
		CDataSource db;
		CSession	session;
		HRESULT		hr;

		CDBPropSet	dbinit(DBPROPSET_DBINIT);
		dbinit.AddProperty(DBPROP_AUTH_CACHE_AUTHINFO, true);
		dbinit.AddProperty(DBPROP_AUTH_ENCRYPT_PASSWORD, false);
		dbinit.AddProperty(DBPROP_AUTH_MASK_PASSWORD, false);
		dbinit.AddProperty(DBPROP_AUTH_PASSWORD, "");
		dbinit.AddProperty(DBPROP_AUTH_USERID, "Admin");
		dbinit.AddProperty(DBPROP_INIT_DATASOURCE, "C:\\db1.mdb");
		dbinit.AddProperty(DBPROP_INIT_MODE, (long)16);
		dbinit.AddProperty(DBPROP_INIT_PROMPT, (short)4);
		dbinit.AddProperty(DBPROP_INIT_PROVIDERSTRING, "");
		dbinit.AddProperty(DBPROP_INIT_LCID, (long)1033);
		dbinit.AddProperty(DBPROP_AUTH_PERSIST_SENSITIVE_AUTHINFO, false);

		hr = db.OpenWithServiceComponents("Microsoft.Jet.OLEDB.4.0", &dbinit);
		if (FAILED(hr))
			return hr;

		hr = session.Open(db);
		if (FAILED(hr))
			return hr;

		CDBPropSet	propset(DBPROPSET_ROWSET);
		propset.AddProperty(DBPROP_CANFETCHBACKWARDS, true);
		propset.AddProperty(DBPROP_IRowsetScroll, true);
		propset.AddProperty(DBPROP_IRowsetChange, true);
		propset.AddProperty(DBPROP_UPDATABILITY, DBPROPVAL_UP_CHANGE | DBPROPVAL_UP_INSERT | DBPROPVAL_UP_DELETE );

		hr = CCommand<CAccessor<CStudent> >::Open(session, "SELECT * FROM student", &propset);
		if (FAILED(hr))
			return hr;

		return MoveNext();
	}

};

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_MYOLEDBSET_H__D4D37F47_845C_40CE_BB1A_58ECD4B40E99__INCLUDED_)