CI framework $this->db->where not get results

Use CI to write the login code, with $this->db->where query the database to verify the account password is always empty return value
The following are the function codes that are validated in the controller:

public function validate_credentials(){        $this->load->model('Bookmark_models');        $query = $this->Bookmark_models->where();                if ($query){            $data = array('username' => $this->input->post('username'),                          'is_loggrd_in' => true);            $this->session->set_userdata($data);            $this->load->view('logged_in_area');        }else {            $this->login();        }

The following is the code in the model:

public function where(){        $this->db->where('username',$this->input->post('username'));        $this->db->where('passwd',sha1($this->input->post('password')));        $query = $this->db->get('user');                if ($query->num_rows == 1){            return true;        }

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Use CI to write the login code, with $this->db->where query the database to verify the account password is always empty return value
The following are the function codes that are validated in the controller:

public function validate_credentials(){        $this->load->model('Bookmark_models');        $query = $this->Bookmark_models->where();                if ($query){            $data = array('username' => $this->input->post('username'),                          'is_loggrd_in' => true);            $this->session->set_userdata($data);            $this->load->view('logged_in_area');        }else {            $this->login();        }

The following is the code in the model:

public function where(){        $this->db->where('username',$this->input->post('username'));        $this->db->where('passwd',sha1($this->input->post('password')));        $query = $this->db->get('user');                if ($query->num_rows == 1){            return true;        }

Use echo $this->db->last_query(); the output native SQL statement to execute in the database to see if there is any result.
num_rows()is a method rather than a property
In addition, it is not recommended that you write this, the model is not recommended to do the controller.

public function login($user, $password)    {        return $this->db->where('username', $user)            ->where('password', sha1($password))            ->get('user')            ->row();    }

public function where(){        $this->db->where('username',$this->input->post('username'));        $this->db->where('passwd',sha1($this->input->post('password')));        $query = $this->db->get('user');        echo $this->db->last_query();exit();        if ($query->num_rows() ){            return true;        }        return false;

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