odbc num_rows codeigniter result_set is empty

我使用此代码来验证用户。

public function verify_user($username, $password)
{
    $q = $this->db->where('username', $username)
        ->where('password', md5($password))
        ->limit(1)
        ->get('users');
    if ($q->num_rows() === 1) {
        echo '<pre>';
        print_r($q->row());
        echo '</pre>';
    } else {
        echo 'EMPTY';
    }
}

但是，当它等于1时，它什么也不显示。

Array
(
)

当我使用此代码修复odbc num_rows=-1问题时，它会出现：第40行的CODEIGNITER问题，直到67

编辑=========================

我想要的是这个

stdClass Object
(
    [id_user] => 2
    [username] => 114080077
    [password] => 0d5ccab9e7f4ae3fe040f143046e386c
)

我修改的代码是：之前（稳定版本）：

/**
 * Number of rows in the result set
 *
 * @access  public
 * @return  integer
 */
function num_rows()
{
    return @odbc_num_rows($this->result_id);
}

之后（问题修复）：

/**
 * Number of rows in the result set
 *
 * @return  int
 */
public function num_rows()
{
    if (is_int($this->num_rows))
    {
        return $this->num_rows;
    }
    elseif (($this->num_rows = @odbc_num_rows($this->result_id)) !== -1)
    {
        return $this->num_rows;
    }
    // Work-around for ODBC subdrivers that don't support num_rows()
    if (count($this->result_array) > 0)
    {
        return $this->num_rows = count($this->result_array);
    }
    elseif (count($this->result_object) > 0)
    {
        return $this->num_rows = count($this->result_object);
    }
    return $this->num_rows = count($this->result_array());
}