如何使用Crud与CodeIginiter

Question

我是codeigniter的新手，并且很难理解如何在我的应用程序中使用crud。如果我使用的代码完全错误，请给我一些松懈，因为我很新，并且已经尝试了一周就已经弄明白了。

我可以创建数据并将其插入数据库，但是我无法更新。如果你们可以看一下我的代码，那就太好了。感谢。

这是我的代码：

login.php控制器

<?php
class login extends CI_Controller {
    public function __construct() {
        parent::__construct();
        $this->load->helper(array('form','url','html'));
        $this->load->library(array('session', 'form_validation'));
        $this->load->database();
        $this->load->model('user_model');
    }
    public function index()
    {
        // get form input
        $email = $this->input->post("email");
        $password = $this->input->post("password");
        $image = $this->input->post['image'];

        // form validation
        $this->form_validation->set_rules("email", "Email", "trim|required");
        $this->form_validation->set_rules("password", "Password", "trim|required");

        if ($this->form_validation->run() == FALSE)
        {
            // validation fail
            $this->load->view('login_view');
        }
        else
        {
            // check for user credentials
            $uresult = $this->user_model->get_user($email, $password, $image);
            if (count($uresult) > 0)
            {
                // set session
                $sess_data = array('login' => TRUE, 'uname' => $uresult[0]->firstname, 'uid' => $uresult[0]->id, 'image' => $uresult[0]->id);
                $this->session->set_userdata($sess_data);
                redirect("Profile/index");
            }
            else
            {
                $this->session->set_flashdata('msg', '<div class="alert alert-danger text-center">Wrong Email-ID or Password!</div>');
                redirect('login/index');
            }
        }
    }
}


Profile.php Controller

<?php
class Profile extends CI_Controller
{
    public function __construct()
    {
        parent::__construct();
        $this->load->helper(array('url','html', 'form'));
        $this->load->library(array('session', 'form_validation'));
        $this->load->database();
        $this->load->model('user_model');


    }

    function index()
    {
        $details = $this->user_model->get_user_by_id($this->session->userdata('uid'));
        $data['uname'] = $details[0]->firstname . " " . $details[0]->lastname;
        $data['uemail'] = $details[0]->email;
        $this->load->view('profile_view', $data);
    }

    public function upload_profile() {
        $input = $this->input->post();

        $config['upload_path'] = './assets/images/'; //path were I save the uploaded profile pics
        $config['allowed_types'] = 'gif|jpg|png'; // allowed types that is mention
        //size of the picture by default
        $config['max_size'] = '100';
        $config['max_width']  = '1024';
        $config['max_height']  = '768';
        $config['overwrite'] = true;

        $this->load->library('upload', $config);
        // display error if the picture is not on the config (sample bmp)
        if ( ! $this->upload->do_upload())
        {
            $error = $this->upload->display_errors(); // display the errors

            $data['upload_error'] = $error;
            if($this->session->userdata('account_id') != null) {  // if there is an account
                $this->load->model('profile'); //model
                $this->load->model('account'); //model
                $data['user'] = $this->profile->get_profile($this->session->userdata('account_id')); //get_profile is a function in model
                $data['account'] = $this->account->get_account($this->session->userdata('account_id')); //get_account is a function in model
                $data['view'] = 'users/settings';
                $data['title'] = "User's Settings";
                $data['error'] = $error;
                $this->load->view('masterpage', $data);
            } else {
                redirect(base_url('index.php/Profile/index'));
            }

        }
        else
        {
            //if no error
            $data = $this->upload->data();
            $updateProfile = array(
                'profile_pic' => $data['file_name']
            );
            $this->load->model('profile');
            $this->profile->update_profile($this->session->userdata('account_id'), $updateProfile); // update the profile of the user
            redirect(base_url('index.php/profile/index'));
        }
    }


}

user_model.php模型

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class user_model extends CI_Model
{
    function __construct()
    {
        parent::__construct();
    }

    function get_user($email, $password)
    {
        $this->db->where('email', $email);
        $this->db->where('password', $password);
        $query = $this->db->get('user');
        return $query->result();
    }

    // get user
    function get_user_by_id($id)
    {
        $this->db->where('id', $id);
        $query = $this->db->get('user');
        return $query->result();
    }

    // insert
    function insert_user($data)
    {
        return $this->db->insert('user', $data);
    }



    public function get_profile($profile_id)
    {
        $this->db->select()->from('profile_tbl')->where('profile_id', $profile_id);
        $query = $this->db->get();

        return $query->first_row('array');
    }



    public function update_profile($profile_id, $data)
    {
        $this->db->where('profile_id', $profile_id);
        $this->db->update('profile_tbl', $data);
        return $this->db->affected_rows();
    }


    public function get_account($account_id)
    {
        $this->db->select()->from('account_tbl');
        $this->db->where('account_id', $account_id);

        $query = $this->db->get();

        return $query->result_array();
    }
}


?>

＆GT;

Profile_view.php视图

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Bootstrap Example</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" type="text/css">
    <link rel="stylesheet" href="<?php echo base_url('css/mystyle.css'); ?>" type="text/css"/>
    <link rel="stylesheet" type="text/css" href="<? echo base_url('assets/css/mystyle.css');?>" />
    <link rel="stylesheet" href="<?php echo base_url()?>assets/css/mystyle.css" type="text/css">
    <?php
    $autoload['helper'] = array('css_js');?>

</head>
<nav class="navbar navbar-inverse">
    <div class="container-fluid">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <div class="mascot">
                <a class="navbar-brand" href="#">
                    <img src="<?php echo base_url()?>assets/img/monstercode.png" alt="Green Monster Mascot" style="width:160px;height:32px;"></a>
            </div>
        </div>
        <div class="collapse navbar-collapse" id="myNavbar">
            <ul class="nav navbar-nav">
                <li class="active"><a href="<?php echo site_url('')?>">Home</a></li>
                <li><a href="<?php echo site_url('Site/sites')?>">Projects</a></li>
                <li><a href="<?php echo site_url('Site/developers')?>">Developers</a></li>
                <li><a href="<?php echo site_url('Site/employers')?>">Employers</a></li>
                <li><a href="#">Contact</a></li>

                <?php if ($this->session->userdata('login')){ ?>

                    <li class="right nav navbar-nav navbar-right"><p class="navbar-text">Hello <?php echo $this->session->userdata('uname'); ?></p></li>
                    <li class="right nav navbar-nav navbar-right"><a href="<?php echo base_url(); ?>index.php/home/logout">Log Out</a></li>
                <?php } else { ?>
                    <li><a href="<?php echo base_url(); ?>index.php/login">Login</a></li>
                    <li><a href="<?php echo base_url(); ?>index.php/signup">Signup</a></li>
                <?php } ?>
            </ul>
        </div>
    </div>
</nav>

<div class="container-fluid text-center">
    <div class="row content">
        <div class="col-sm-2 sidenav">
            <div class="well">
                <p>User Picture <br/><br/><br/>

                    <br/><br/><br/><br/><br/><br/></p>


            </div>

            <div class="well">
                <p>User Info<br/> Name: <?php echo $uname; ?><br/> Email: <?php echo $uemail; ?> <br/><br/><br/><br/><br/><br/><br/><br/><br/></p>
            </div>
        </div>
        <div class="col-sm-8 text-left">


<div class="container">
    <div class="row">
        <div class="col-md-4">
            <h4>Profile Summary</h4>
            <hr/>
            <p>Name: <?php echo $uname; ?></p>
            <p>Email: <?php echo $uemail; ?></p>
            <p>...</p>
        </div>
    </div>
</div>
            <hr>
            <h3>More User Info</h3>
            <p>Lorem ipsum...</p>
        </div>
    <div class="col-sm-2 sidenav">
        <div class="well">
            <p>Job Offers <br/><br/><br/><br/><br/><br/><br/><br/><br/></p>
        </div>
        <div class="well">
            <p>Job Offers <br/><br/><br/><br/><br/><br/><br/><br/><br/></p>
        </div>



        // default.png if haven't uploaded profile picture
        <?php $profilePic = "default.png"; ?>
        // if already uploaded profile picture it will display
        <?php if ($user['profile_pic'] != null) { ?>
            <?php $profilePic = $user['profile_pic']; ?>
        <?php }  ?>
        // if there is an error in uploading
        <?php if(isset($upload_error)) { ?>
            <div class="col-lg-12">
                <div class="alert alert-danger alert-dismissable">
                    <button type="button" class="close" data-dismiss="alert" aria-hidden="true">×</button>
                    Uploading profile image could not be completed. <?php print_r($upload_error); ?>
                </div>
            </div>
        <?php } ?>
        <div class="col-lg-12">
            //display the profile picture
            <img src="<?php echo base_url('assets/images/'.$profilePic); ?>" width="100" />
            // call the controller upload_profile
            <?php echo form_open_multipart(base_url('index.php/Profile/upload_profile'));?>
            <input type="file" name="userfile" id="userfile" size="20" style="display:none;" />
            <label for="userfile" class="btn btn-info btn-sm">Choose Image</label>
            <input type="submit" class="btn btn-xs" value="edit profile" />
            </form>
        </div>



    </div>
</div>
</div>

<script type="text/javascript" src="<?php echo base_url("assets/js/jquery-1.10.2.js"); ?>"></script>
<script type="text/javascript" src="<?php echo base_url("assets/js/bootstrap.js"); ?>"></script>
</body>
</html>

Answer 1

看看这段代码

function index()
    {
        $details = $this->user_model->get_user_by_id($this->session->userdata('uid'));
        $data['uname'] = $details[0]->firstname . " " . $details[0]->lastname;
        $data['uemail'] = $details[0]->email;
        $this->load->view('profile_view', $data);
    }

您正在向视图发送用户电子邮件和姓名。 但在您的视图中，您使用的是不存在的<?php $profilePic = $user['profile_pic']; ?>。这就是您收到未定义变量错误的原因。

<强>模型

 // instead of returning $query->result(), return $query->row() which would return only one row
    function get_user_by_id($id)
    {
        $this->db->where('id', $id);
        $query = $this->db->get('user');
        return $query->row();
    }

<强>控制器

不是像您一样传递单个用户的详细信息，而是传递整个用户对象。您可以在此视图中显示数据Email : <?= $user->email ?>如果您的用户表包含数百个字段，那么您不必使用数百个变量（我知道它不能包含那么多字段，只是为了指出问题）。

function index()
    {
        $user = $this->user_model->get_user_by_id($this->session->userdata('uid'));
        $data['user'] = $user;
        $this->load->view('profile_view', $data);
    }

如果profile_pic是您user表格中的字段，则可以随时查看

<?php if($user->profile_pic != null)

Answer 2

这是对你出现的评论的答案......

您的视图中的代码需要稍微更改，因为您已将PHP注释放在PHP标记之外，并且您已经过度使用了php标记，因此可以进行一些清理。你可以改变......

这

// default.png if haven't uploaded profile picture
<?php $profilePic = "default.png"; ?>
// if already uploaded profile picture it will display
<?php if ($user['profile_pic'] != null) { ?>
    <?php $profilePic = $user['profile_pic']; ?>
<?php }  ?>

要

<?php
// default.png if haven't uploaded profile picture
$profilePic = "default.png";
// if already uploaded profile picture it will display
if($user['profile_pic'] != null) {
    $profilePic = $user['profile_pic'];
}
?>