How to put milliseconds into an SQL datetime field using void RFX_Date(CFieldExchange* pFX, const char* szName, TIMESTAMP_STRUCT& value); ?

I have a class that wraps CRecordset to read/write values to an SQL table using ODBC.

I recently discovered however that when dealing with datetime fields the milliseconds were being lost.

So I looked up RFX_Date and did some googling to find that the version we had used was the CTime version, which has no milliseconds.

OK, so I changed my class from using CTimes to TIMESTAMP_STRUCT.

I ran my code and stepped through and could now see the milliseconds being valid using the following code where m_tDate is the TIMESTAMP_STRUCT which is used in the RFX_Date.

The problem is it isn't actually working! The value in the table is still truncated to the nearest second. I have checked using SQL Server 2005 management studio.

I have also tried using a COleDateTime but also debugs fine but doesn't actually put the milliseconds into the table datetime field.

What am I missing?
Thanks.

// From the header
TIMESTAMP_STRUCT m_Date;
 
// From the source
CProductHistorySet::CProductHistorySet(CDatabase* pdb)
	: CRecordset(pdb)
{
	m_nDefaultType = dynaset;
 
	SYSTEMTIME sysTime;
 
	::GetSystemTime(&sysTime);
 
	m_Date.year = sysTime.wYear;
	m_Date.month = sysTime.wMonth;
	m_Date.day = sysTime.wDay;
	m_Date.hour = sysTime.wHour;
	m_Date.minute = sysTime.wMinute;
	m_Date.second = sysTime.wSecond;
	m_Date.fraction = sysTime.wMilliseconds;
}
 
void CProductHistorySet::DoFieldExchange(CFieldExchange* pFX)
{
	//{{AFX_FIELD_MAP(CProductHistorySet)
	pFX->SetFieldType(CFieldExchange::outputColumn);
	RFX_Date(pFX, _T("[Datedb]"), m_Date);
...
}

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