Programming

 CosBuf << "SELECT " << m_DefnVec.getColNameList() << " "
          << "FROM " << OBTTable.c_str() << " "
          << "ORDER BY " << DATE_COL;
    strSQLStmt = CosBuf.str();
    m_ptrDBConnect->executeSql(strSQLStmt.c_str(),reader);
while (reader.read())
   {
     if (reader.isValid())
     {
      
      ...
      ..

DB part :

void DSDbReader::AddRecord(int nSize, COLUMN_DATA* data)
{
std::shared_ptr<DSRecord> pRec = std::make_shared<DSRecord>();
for(int k = 0; k < nSize; k++)
{
pRec->AddColumnData();
COLUMN_DATA *pColumnData = pRec->GetColumnData(k);
pColumnData->AllocateValue(data[k].m_nValueLen);
   memcpy(pColumnData->m_psValue, data[k].m_psValue, data[k].m_nValueLen);
   pColumnData->m_nValueLen = data[k].m_nValueLen;
}
m_oRecords.push_back(pRec);

}