department.h

vc++6.0数据库编程大全一书得各个章节得源码,比较详细.可以仔细参照学习!

// Department.H : Declaration of the CDepartment class

#ifndef __DEPARTMENT_H_
#define __DEPARTMENT_H_

class CDepartmentAccessor
{
public:
	TCHAR m_DepartmentCode[5];
	TCHAR m_DepartmentName[51];

BEGIN_COLUMN_MAP(CDepartmentAccessor)
	COLUMN_ENTRY(1, m_DepartmentCode)
	COLUMN_ENTRY(2, m_DepartmentName)
END_COLUMN_MAP()

DEFINE_COMMAND(CDepartmentAccessor, _T(" \
	SELECT \
		DepartmentCode, \
		DepartmentName  \
		FROM Department"))

	// 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));
	}
};
//Chuck Wood changed class definition to use an array rowset
class CDepartment : 
//	public CCommand<CAccessor<CDepartmentAccessor>>
	public CCommand<CAccessor<CDepartmentAccessor>, CArrayRowset<CDepartmentAccessor> >
{
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_PERSIST_SENSITIVE_AUTHINFO, false);
		dbinit.AddProperty(DBPROP_INIT_DATASOURCE, OLESTR("Classes"));
		dbinit.AddProperty(DBPROP_INIT_PROMPT, (short)4);
		dbinit.AddProperty(DBPROP_INIT_LCID, (long)1033);
		hr = db.Open(_T("MSDASQL"), &dbinit);
		if (FAILED(hr))
			return hr;

		return m_session.Open(db);
	}
	HRESULT OpenRowset()
	{
		// Set properties for open
		CDBPropSet	propset(DBPROPSET_ROWSET);
		propset.AddProperty(DBPROP_IRowsetChange, true);
		propset.AddProperty(DBPROP_UPDATABILITY, DBPROPVAL_UP_CHANGE | DBPROPVAL_UP_INSERT | DBPROPVAL_UP_DELETE);
//Changed by Chuck Wood to use proper ancestor
		return CCommand<CAccessor<CDepartmentAccessor>, CArrayRowset<CDepartmentAccessor> >::Open(m_session, NULL, &propset);
	}
	CSession	m_session;
};

#endif // __DEPARTMENT_H_