_variant_t vUsername,vBirthday,vID,vOld;
_RecordsetPtr m_pRecordset;
m_pRecordset.CreateInstance( "ADODB.Recordset ");
m_pRecordset-> Open( "SELECT * FROM users ",_variant_t((IDispatch*)m_pConnection,true),adOpenStatic,adLockOptimistic,adCmdText);
while(!m_pRecordset-> adoEOF)///這裏爲什麼是adoEOF而不是EOF呢?還記得rename( "EOF ", "adoEOF ")這一句嗎?
{
// 之前我的程序里老用強制類型轉換結果永遠都報異常,憤恨不已
vID = m_pRecordset-> GetCollect(_variant_t((long)0));///取得第1列的值,從0開始計數,你也可以直接給出列的名稱,如下一行
vUsername = m_pRecordset-> GetCollect( "username ");///取得username字段的值
vOld = m_pRecordset-> GetCollect( "old ");
vBirthday = m_pRecordset-> GetCollect( "birthday ");
///在DEBUG方式下的OUTPUT窗口輸出記錄集中的記錄
if(vID.vt != VT_NULL && vUsername.vt != VT_NULL && vOld.vt != VT_NULL && vBirthday.vt != VT_NULL)
TRACE( "id:%d,姓名:%s,年齡:%d,生日:%s/r/n ",vID.lVal,(LPCTSTR)(_bstr_t)vUsername,vOld.lVal,(LPCTSTR)(_bstr_t)vBirthday);
m_pRecordset-> MoveNext();///移到下一條記錄
}
m_pRecordset-> MoveFirst();///移到首條記錄
m_pRecordset-> Delete(adAffectCurrent);///刪除當前記錄
///添加三條新記錄並賦值
for(int i=0;i <3;i++)
{
m_pRecordset-> AddNew();///添加新記錄
m_pRecordset-> PutCollect( "ID ",_variant_t((long)(i+10)));
m_pRecordset-> PutCollect( "username ",_variant_t( "葉利欽 "));
m_pRecordset-> PutCollect( "old ",_variant_t((long)71));
m_pRecordset-> PutCollect( "birthday ",_variant_t( "1930-3-15 "));
}
m_pRecordset-> Move(1,_variant_t((long)adBookmarkFirst));///從第一條記錄往下移動一條記錄,即移動到第二條記錄處
m_pRecordset-> PutCollect(_variant_t( "old "),_variant_t((long)45));///修改其年齡
m_pRecordset-> Update();///保存到庫中