ADO读写DateTime方式

// 读取日期
var = m_pResultSet->GetCollect(_variant_t("Birth_Time"));

DATE            dt      = var.date;
COleDateTime    da      = COleDateTime(dt);
CString         strData = da.Format(_T("%Y-%m-%d"));
m_GridList.SetItemText(m_nRow, m_nColumn, strData);

// 写入日期
COleDateTime    oleDate = COleDateTime::GetCurrentTime();
CString         strDate = oleDate.Format(_T("%Y-%m-%d %H:%M:%S"));

m_pBorrowRS->Fields->GetItem(_variant_t("Borrow_Date"))->PutValue(_variant_t(strDate));
m_GridList.SetItemText(m_nRow, m_nColumn, strDate);

或：
COleDateTime    oleDate = COleDateTime::GetCurrentTime();

_variant_t  vtDate;
vtDate.vt   = VT_DATE;
vtDate      = oleDate.Format(_T("%Y-%m-%d %H:%M:%S"));

m_pBorrowRS->Fields->GetItem(_variant_t("Borrow_Date"))->PutValue(vtDate);
m_GridList.SetItemText(m_nRow, , (LPCTSTR)_bstr_t(vtDate));
 COleDateTime::GetCurrentTime()        var.date                

                                    \                     /                 

                                      \                 /                  

                                         \            /                   

                                COleDateTime  oleDate;                                            

                                        /              \                  

                                      /                  \                

                                    /                      \   

              var = oleDate.Format(...)     strDate = oleDate.Format(...)

也可以是用sql语句直接插入的方式：

strSql.Format(_T("update SESSIONS set BLOGGEDON = 0 ,DATE_LOGOFF = to_date('%s', 'YYYY/MM/DD HH24:MI:SS')  where ID = '%s'"),

这就是直接插入时间了

ps：

检查字符串是否为空

FieldPtr filedptrTmp = m_pRecordset->Fields->GetItem((_bstr_t)(LPCTSTR)m_strDatabaseTheoryWeight);

   if ((filedptrTmp->Value.vt != VT_NULL) && (filedptrTmp->Value.vt != VT_EMPTY))

　　　　FieldPtr filedptrTmp = 。。。。