record.h

来自「VC6数据库开发指南」· C头文件 代码 · 共 74 行

// Record.H : Declaration of the CRecord class

#ifndef __RECORD_H_
#define __RECORD_H_

class CRecordAccessor
{
public:
	LONG m_column0;
	TCHAR m_column1[41];
	SHORT m_column2;

BEGIN_COLUMN_MAP(CRecordAccessor)
    COLUMN_ENTRY(1,m_column0);
    COLUMN_ENTRY(2,m_column1);
    COLUMN_ENTRY(3,m_column2);
END_COLUMN_MAP()

DEFINE_COMMAND(CRecordAccessor, _T(" \
	SELECT \
		* \
		FROM 学生"))

	// 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 CRecord : public CCommand<CAccessor<CRecordAccessor> >
{
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("学生信息"));
		dbinit.AddProperty(DBPROP_INIT_PROMPT, (short)4);
		dbinit.AddProperty(DBPROP_INIT_LCID, (long)2052);
		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);

		return CCommand<CAccessor<CRecordAccessor> >::Open(m_session, NULL, &propset);
	}
	CSession	m_session;
};

#endif // __RECORD_H_