一个用户管理的ci框架的小demo--转载

一个ci框架的小demo

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最近在学习ci框架，作为一个初学者，在啃完一遍官方文档并也跟着官方文档的例程（新闻发布系统）做了一遍，决定在将之前练习PHP与MySQL数据库的用户管理系统再用ci框架实现一遍。

主要由三个简单的界面构成：

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看起来很简单对不对！没有关系，这不重要~ 
接下来我们来看代码： 
ci的配置我就不用讲了哈，我的配置如下： 
database.php 配置文件

 'hostname' => 'localhost',
    'username' => 'root',
    'password' => 'root',
    'database' => 'test',
    'dbdriver' => 'mysqli',
    'dbprefix' => '',
    'pconnect' => FALSE,
    'db_debug' => (ENVIRONMENT !== 'production'),
    'cache_on' => FALSE,
    'cachedir' => '',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',

一定要配置config.php中的base_url，原因你会知道的

$config['base_url'] = 'http://localhost:81/ciDemo/Code/';

接下来是控制器的代码： 
我建立了一个user.php的控制器，目录是application/controllers/user.php

<?php
/**
* 数据库的增删改查
*/
class User extends CI_controller
{

    function __construct()
    {
        parent::__construct();
        $this->load->model('user_model');
        // $this->load->helper('url_helper');
        $this->load->helper('url');
    }
    public function index()
    {
        // $this->load->model('user_model');
        $arr = $this->user_model->getAll();
        // var_dump($arr);
        $data['title'] = 'Userlist';

        $this->load->view('templates/header', $data);
        $this->load->view('user/index',array('arr'=>$arr));
        $this->load->view('templates/footer');
    }
    public function insert()
    {
        $this->load->helper('form');

        $data['title'] = 'Create a new user';

        // $this->load->model('user_model');
        // $arr = array('uaername' => '111','password' => 'md5(222)' );

        $this->load->view('templates/header', $data);
        $this->load->view('user/adduser');
        $this->load->view('templates/footer');

    }
    public function insert_ok()
    {
        // echo "join";

        // if ($this->input->post('submit_user')) {
            $arr = array(
            'username' => $this->input->post('username'),
            'password' => md5($this->input->post('password'))
            );
            $query = $this->user_model->user_insert($arr);
            // var_dump($query);
            if ($query) {
                // echo "添加成功";
                // $this->index();
                redirect('user/index');
            } else {
                echo "添加失败";
            }
        // }
    }
    public function update()
    {
        $this->load->helper('form');

        $data['title'] = 'Update user';

        // $this->load->model('user_model');
        // $arr = array('uaername' => '111','password' => 'md5(222)' );
        $id = $this->uri->segment(3, 0);
        // echo $id;
        $arr = $this->user_model->user_select($id);
        // var_dump($arr);
        //怎么把指定ID的username传到视图中去
        $this->load->view('templates/header', $data);
        $this->load->view('user/editUser', array('get_username'=>$arr));
        $this->load->view('templates/footer');
    }
    public function update_ok()
    {
        // $this->load->model('user_model');
        // $arr = array('username' => 'kkk','password' => 'md5(333)' );
        $arr = array(
            'username' => $this->input->post('username'),
            'password' => md5($this->input->post('password'))
            );
        // $id = $_GET['id'];
        //怎么获取ID值？
        $id = $this->uri->segment(3, 0);
        $query = $this->user_model->user_update($id,$arr);
        if ($query) {
            // echo "删除成功";
            // $this->index();
            redirect('user/index');
        } else {
            echo "更新失败";
        }
    }

    public function delete()
    {
        $id = $this->uri->segment(3, 0);
        // $this->load->model('user_model');
        $query = $this->user_model->user_delete($id);
        if ($query) {
            // echo "删除成功";
            // $this->index();
            redirect('user/index');
        } else {
            echo "删除失败";
        }

    }
    // public function select()
    // {
    //  // $this->load->model('user_model');
    //  $arr = $this->user_model->user_select();
    //  print_r($arr);
    //  echo $arr[0]->id;
    // }
}

模型的代码： 
目录是application/models/user_model.php

<?php
 /**
 * 数据库增删改查......
 */
 class User_model extends CI_Model
 {
    //构造函数
    function __construct()
    {
        parent::__construct();
        //connect to the database
        $this->load->database();
        //$this->load->insert($t_name,$data)
    }
    //所有数据
    function getAll()
    {
        $res = $this->db->get('user');
        return $res->result_array();
    }
    //增加数据
    function user_insert($arr)
    {
        return $this->db->insert('user', $arr);
    }
    //更新数据
    function user_update($id,$arr)
    {
        $this->db->where('id',$id);
        return $this->db->update('user',$arr);
    }
    //删除数据
    function user_delete($id)
    {
        $this->db->where('id',$id);
        return $this->db->delete('user');
    }
    //查找数据
    function user_select($id)
    {
        $this->db->where('id',$id);
        $this->db->select('*');
        $query = $this->db->get('user');
        return $query->result_array();
    }

 }

接下来是视图： 
用户列表的视图 application/views/user/index.php

<?php
    // var_dump($arr);
?>
<h2>用户列表<a href="<?php echo site_url('user/insert');?>">添加用户</a></h2>
    <table border="1" cellspacing="0" cellpadding="0" width="80%" bgcolor="#ABCDEF">
        <tr>
            <td>编号</td>
            <td>用户名</td>
            <td>操作</td>
        </tr>
        <?php $i=1; foreach($arr as $row):?>
        <tr>
            <td><?php echo $i;?></td>
            <td><?php echo $row['username'];?></td>
            <td><a href="<?php echo site_url().'/user/update/'.$row['id'];?>">更新</a>|<a href="<?php echo site_url().'/user/delete/'.$row['id'];?>">删除</a></td>
        </tr>
        <?php $i++; endforeach;?>
    </table>

添加用户的视图：application/views/user/adduser.php

<!-- <h2>添加用户</h2> -->
<form action="<?php echo site_url("user/insert_ok");?>" method="post">
<?php //echo form_open('user/insert')?>
    <table border="1" cellpadding="0" cellspacing="0" bgcolor="#ABCDEF" width="80%">
        <tr>
            <td>用户名</td>
            <td><input type="text" name="username" id="username" placeholder="请输入合法用户名" required></td>
        </tr>
        <tr>
            <td>密码</td>
            <td><input type="password" name="password" id="password" placeholder="请输入密码" required></td>
        </tr>
        <tr>
            <td colspan="2"><input type="submit" value="添加用户" name="submit_user"></td>
        </tr>
    </table>
</form>

更新用户的视图：application/views/user/edituser.php

<!-- <h2>更新用户</h2> -->
<form action="<?php foreach ($get_username as $row):?><?php echo site_url().'/user/update_ok/'.$row['id'];?><?php endforeach;?>" method="post">
    <table border="1" cellpadding="0" cellspacing="0" bgcolor="#ABCDEF" width="80%">
        <tr>
            <td>用户名</td>
            <td><input type="text" name="username" id="" placeholder="请输入合法用户名" required value="<?php foreach ($get_username as $row):?><?php echo $row['username'];?><?php endforeach;?>"></td>
        </tr>
        <tr>
            <td>密码</td>
            <td><input type="password" name="password" id="" placeholder="请输入密码" required></td>
        </tr>
        <tr>
            <td colspan="2"><input type="submit" value="更新用户"></td>
        </tr>
    </table>
</form>

为什么我的视图都没有HTML头和尾，因为我把他们分开写在了views视图下的templates文件夹里： 
application/views/templates/header.php

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title><?php echo $title; ?></title>
</head>
<body>

    <h1><?php echo $title; ?></h1>

application/views/templates/footer.php

 <em>&copy; 2016</em>
</body>
</html>