passwordsset.h

< Visual C++数据库经典开发实例精解>>的实例源码

// PasswordsSet.h : interface of the CPasswordsSet class
//
/////////////////////////////////////////////////////////////////////////////

#if !defined(AFX_PASSWORDSSET_H__54E691E6_DFF2_4BE9_88B3_1754A14759E1__INCLUDED_)
#define AFX_PASSWORDSSET_H__54E691E6_DFF2_4BE9_88B3_1754A14759E1__INCLUDED_

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

class CPassword
{
public:
	CPassword()
	{
		memset( (void*)this, 0, sizeof(*this) );
	};
	//为每个字段定义对应的数据成员
	char m_password[11];
	char m_userid[16];


BEGIN_COLUMN_MAP(CPassword)
		//建立数据成员与字段变量的映射
		COLUMN_ENTRY_TYPE(2, DBTYPE_STR, m_password)
		COLUMN_ENTRY_TYPE(1, DBTYPE_STR, m_userid)
END_COLUMN_MAP()

};

class CPasswordsSet : public CCommand<CAccessor<CPassword> >
{
public:

	HRESULT Open()
	{
		CDataSource db;
		CSession	session;
		HRESULT		hr;
		//定义打开记录集的选项
		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_PERSIST_ENCRYPTED, false);
		dbinit.AddProperty(DBPROP_AUTH_PERSIST_SENSITIVE_AUTHINFO, false);
		dbinit.AddProperty(DBPROP_AUTH_USERID, "Admin");
		dbinit.AddProperty(DBPROP_INIT_DATASOURCE, "C:\\VCSample\\数据库\\passwords.mdb");
		dbinit.AddProperty(DBPROP_INIT_MODE, (long)16);
		dbinit.AddProperty(DBPROP_INIT_PROMPT, (short)4);
		dbinit.AddProperty(DBPROP_INIT_PROVIDERSTRING, ";COUNTRY=0;CP=1252;LANGID=0x0409");
		dbinit.AddProperty(DBPROP_INIT_LCID, (long)1033);

		hr = db.OpenWithServiceComponents("Microsoft.Jet.OLEDB.3.51", &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 );
		//打开记录集
		hr = CCommand<CAccessor<CPassword> >::Open(session, "SELECT * FROM password", &propset);
		if (FAILED(hr))
			return hr;

		return MoveNext();//执行MoveNext()函数，使第一条记录成为当前记录
	}

};

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

#endif // !defined(AFX_PASSWORDSSET_H__54E691E6_DFF2_4BE9_88B3_1754A14759E1__INCLUDED_)