;     (UCHAR FAR*)pszTableOwner,SQL_NTS,
            (UCHAR FAR*)pszTableName,SQL_NTS,
            (UCHAR FAR*)pszColumnName,SQL_NTS));
        if (!Check(nRetCode))
            ThrowDBException(nRetCode,m_hstmt);
        // 分配内存，填写信息
        AllocAndCacheFieldInfo();
        AllocRowset();
        MoveNext();
        m_bBOF = m_bEOF;
    }

//异常信息的捕获
    CATCH_ALL(e)
    {
        Close();
        THROW_LAST();
    }
    END_CATCH_ALL
    return TRUE;
}
//获取记录集信息
void CColumns::DoFieldExchange(CFieldExchange* pFX)
{
    pFX->SetFieldType(CFieldExchange::outputColumn);
    RFX_Text(pFX,_T("TABLE_QUALIFIER"),m_strTableQualifier);
    RFX_Text(pFX,_T("TABLE_OWNER"),m_strTableOwner);
    RFX_Text(pFX,_T("TABLE_NAME"),m_strTableName);
    RFX_Text(pFX,_T("COLUMN_NAME"),m_strColumnName);
    RFX_Int(pFX,_T("DATA_TYPE"),m_nDataType);
    RFX_Text(pFX,_T("TYPE_NAME"),m_strTypeName);
    RFX_Long(pFX,_T("PRECISION"),m_nPrecision);
    RFX_Long(pFX,_T("LENGTH"),m_nLength);
    RFX_Int(pFX,_T("SCALE"),m_nScale);
    RFX_Int(pFX,_T("RADIX"),m_nRadix);
    RFX_Int(pFX,_T("NULLABLE"),m_fNullable);
    RFX_Text(pFX,_T("REMARKS"),m_strRemarks);
}
CColumns::CColumns(CDatabase* pDatabase): CRecordset(pDatabase)
{
    m_strTableQualifier    = _T("");
    m_strTableOwner        = _T("");
    m_strTableName        = _T("");
    m_strColumnName        = _T("");
    m_nDataType             = 0;
    m_strTypeName        = _T("");
    m_nPrecision        = 0;
    m_nLength    &nbs