temperatures.h

这是ATL电子书的随书代码

// Temperatures.H : Declaration of the CTemperatures class

#ifndef __TEMPERATURES_H_
#define __TEMPERATURES_H_

class CTemperaturesAccessor
{
public:
	TCHAR m_City[27];
	unsigned long m_High;
	unsigned long m_Low;
	double m_Precipitation;
	unsigned long m_customerid;
	unsigned long m_orderid;
	DBDATE m_orderdate;
	double m_Amount;

BEGIN_COLUMN_MAP(CTemperaturesAccessor)
	COLUMN_ENTRY(1, m_City)
	COLUMN_ENTRY(2, m_High)
	COLUMN_ENTRY(3, m_Low)
	COLUMN_ENTRY(4, m_Precipitation)
END_COLUMN_MAP()


	// You may wish to call this function if you are inserting a record and wish to
	// initialize all the fields, if you are not going to explicitly set all of them.
	void ClearRecord()
	{
		memset(this, 0, sizeof(*this));
	}
};

class CTemperatures : public CTable<CAccessor<CTemperaturesAccessor> >
{
public:
	HRESULT Open()
	{
		HRESULT		hr;

		hr = OpenDataSource();
		if (FAILED(hr))
			return hr;

		return OpenRowset();
	}
	HRESULT OpenDataSource()
	{
		HRESULT		hr;
		CDataSource db;
		CDBPropSet	dbinit(DBPROPSET_DBINIT);

		dbinit.AddProperty(DBPROP_AUTH_PASSWORD, OLESTR("password"));
		dbinit.AddProperty(DBPROP_AUTH_PERSIST_SENSITIVE_AUTHINFO, false);
		dbinit.AddProperty(DBPROP_AUTH_USERID, OLESTR("rpatton"));
		dbinit.AddProperty(DBPROP_INIT_DATASOURCE, OLESTR(""));
		dbinit.AddProperty(DBPROP_INIT_LCID, (long)0);
		dbinit.AddProperty(DBPROP_INIT_LOCATION, OLESTR("d:\\my documents\\serverfile.txt"));
		dbinit.AddProperty(DBPROP_INIT_MODE, (long)0);
		dbinit.AddProperty(DBPROP_INIT_PROMPT, (short)2);
		dbinit.AddProperty(DBPROP_INIT_PROVIDERSTRING, OLESTR(""));
		dbinit.AddProperty(DBPROP_INIT_TIMEOUT, (long)0);
		hr = db.Open(_T("ATL_OLEDB_Prov.CarusoeProv.1"), &dbinit);
		if (FAILED(hr))
			return hr;

		return m_session.Open(db);
	}
	HRESULT OpenRowset()
	{
		return CTable<CAccessor<CTemperaturesAccessor> >::Open(m_session, _T("d:\\my documents\\temperatures.txt"));
	}
	CSession	m_session;
};

#endif // __TEMPERATURES_H_