各种demo——CI框架学习

一.CI的HelloWorld！

注意：CI禁止直接通过文件目录来访问控制器。

 ./application/controllers/hello.php 1 <?php 2 //放止用户直接通过路径来访问控制器，如果这样的话会显示找不到（封装） 3 if ( ! defined('BASEPATH')) exit('No direct script access allowed'); 4  5 class Hello extends CI_Controller { 6  7     public function sayhello($name,$name2){ 8         echo $name,",Hello CI to ",$name2; 9     }10 }

 

 

二.CI的文本计时器demo——文本操作与调用视图操作

调用视图的基本格式：

$this->load->view('XXX');

 

 1 <?php 2 //./applications/controllers/hello.php 3 //放止用户直接通过路径来访问控制器，如果这样的话会显示找不到（封装） 4 if ( ! defined('BASEPATH')) exit('No direct script access allowed'); 5  6 class Hello extends CI_Controller { 7  8     public function sayhello($name,$name2){ 9         echo $name,",Hello CI to ",$name2;10     }11 12     public function show(){13         $name = "deng";14         @$count = file_get_contents('./num.txt');  //装饰器15         $count = $count ? $count:0;16         $count++;17         $data = array('key'=>$name,'value'=>$count);18 19         $re = fopen('./num.txt','w');20         fwrite($re, $count);21 22         $this->load->view("testview.php",$data);   //装载两个视图页面23         $this->load->view("testview2.php");24     }25 }

 

 

三.CI的数据库demo——对数据模型的增，删，改，查

数据模型——

1.数据模型是一个数据库类

2.一个模型针对一张表

创建一个模型必须注意——

必须继承数据核心类CI_Model，同时重载父类中的构造方法

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

对数据库的操作——

1.连接数据库（$this->load->database());

2.插入数据（$this->db->insert($t_name,$arr);)

$t_name——你要操作的表]

$arr——你要插入的数据("key"=>value)

3.更新数据

$this->db->where(字段名，字段值)

$this->db->update(表名，修改值的数组)

4.查询数据

$this->db->where(字段名，字段值)

$this->db->select(字段)

$query = $this->db->get(表名)

return $query->result();

5.删除数据

$this->db->where(字段名，字段值)

$this->db->delete(表名)

 

 1 ./application/controllers/user.php 2 <?php  3 if ( ! defined('BASEPATH')) exit('No direct script access allowed'); 4  5 class User extends CI_Controller { 6  7     public function insert(){ 8         $this->load->model('test_m'); 9         $arr = array('usid'=>1,'uname'=>'deng1','upass'=>'1234');10         $this->test_m->user_insert($arr);11     }12 13     public function update(){14         $this->load->model('test_m');15         $arr = array('usid'=>22,'uname'=>'deng222','upass'=>'1233333');16         $this->test_m->user_update(2,$arr);17     }18 19     public function delete(){20         $this->load->model('test_m');21         $this->test_m->user_delete(22);22     }23 24     public function select()25     {26         $this->load->model('test_m');27         $arr = $this->test_m->user_select(1);28         print_r($arr);29         echo $arr[0]->usid;30 31     }32 }33 34 /* End of file welcome.php */35 /* Location: ./application/controllers/welcome.php */

 

 1 <?php 2 /** 3 *  ./application/models/test_m.php 4 */ 5 class Test_m extends CI_Model 6 { 7      8     function __construct() 9     {10         parent::__construct();11         //connect to the database12         $this->load->database();13         //$this->load->insert($t_name,$data)14     }15 16     function user_insert($arr){17         $this->db->insert('user',$arr);18     }19 20     function user_update($id,$arr)21     {22         $this->db->where('usid',$id);23         $this->db->update('user',$arr);24     }25 26     function user_delete($id){27         $this->db->where('usid',$id);28         $this->db->delete('user');29     }30 31     function user_select($id){32         $this->db->where('usid',$id);33         $this->db->select('*');34         $query = $this->db->get('user');35         return  $query->result();36     }37 }38 ?>

 

 四.CI的文件上传demo

 1.面向过程的文件上传方法

 

 1 #/controllers/upload.php 2 <?php  3 if ( ! defined('BASEPATH')) exit('No direct script access allowed'); 4  5 class Upload extends CI_Controller { 6  7     //显示带表单的视图 8     public function index(){ 9         $this->load->view('up');10 11     }12 13     //显示上传信息14     public function up(){15 16         if(!empty($_POST['sub'])){17             //打印变量的函数18             //var_dump($_FILES['upfile']);   19             $file = $_FILES['upfile'];20             if($file['size'] >= 20000000){21                 echo "size no!";22             }23             else{24                 switch ($file['type']) {25                     case 'image/jpeg':26                         $br = '.jpg';27                         break;28                     29                     default:30                         $br = false;31                         break;32                 }33 34                 if($br){35                     $time = time();36                     move_uploaded_file($file['tmp_name'], "./upload/$time$br");37 38                 }39                 else{40                     echo "type no";41                 }42             }43 44         }45     }46 47 }

 

1 #/views/up.php2 <html>3 <!--注意相对路径的建立-->4     <form action="/CI/index.php/upload/up" method="post" enctype="multipart/form-data">5         <input type="file" name="upfile" />6         <input type="submit" name="sub" value="提交" />7     8     </form>9 </html>

 2.面向对象的CI框架文件上传方法

 

 a.定义一个数组，设置一些与上传相关的参数

//设置上传目录，这里写./,目录要建在网站根目录，就是和application同级//如果你要放在application目录下，可以用系统定义的路径常量APPPATH//例如：APPPATH.'uploads/'$config['upload_path'] = './uploads/';//设置允许上传的类型$config['allowed_types'] = 'gif|jpg|png';$config['max_size'] = '100';//如果是图片还可以设置最大高度和宽度$config['max_height'] = 768;$config['max_width'] = 1024;

b.还可以设置其他的一些额外参数，详细看用户手册

c.调用CI的上传通用类，并执行上传

//upload为调用的类名，全小写

$this->load->library('upload',$config);

//如果上传框的name写的是userfile，那就不用传参数了，如果不是，把name的值传进去

$this->upload->do_upload('上传框的name');

d.接收出错信息或成功信息

//出错信息

$error = array('error' => $this->upload->display_error());

//成功信息

$data = array('upload_data' => $this->upload->data());

 

 1 <?php  2 if ( ! defined('BASEPATH')) exit('No direct script access allowed'); 3  4 class Upload extends CI_Controller { 5  6     //显示带表单的视图 7     public function index(){ 8         $this->load->view('up'); 9 10     }11 12     //显示上传信息13     public function up(){14 15         $config['upload_path'] = './uploads/';16         $config['allowed_types'] = 'gif|jpg|png';17         $config['max_size'] = "2000";18 19         $this->load->library('upload',$config);20 21         //打印成功或错误的信息22         if($this->upload->do_upload('upfile'))23         {24             $data = array("upload_data" => $this->upload->data());25             var_dump($data);26         }27         else28         {29             $error = array("error" => $this->upload->display_errors());30             var_dump($error);31         }32     }33 34 }

 

 五.CI的登录验证demo

1.利用CI类实现session登录

a.修改配置文件（config.php）

$config['encryption_key']

b.加载SESSION类

$this->load->library('session');

c.创建SESSION

$this->session->set_userdata($array);

d.查看SESSION

$this->session->userdata(session名);

e.删除SESSION

$this->session->unset_userdata('SESSION名');

 

 1 ./application/controllers/login.php 2 <?php  3 if ( ! defined('BASEPATH')) exit('No direct script access allowed'); 4  5 class Login extends CI_Controller { 6  7     public function index() 8     { 9         $this->load->view('login.html');10     }11 12     public function checklogin(){13         $this->load->model("test_m");14         $user = $this->test_m->user_select($_POST['uname']);15         if($user){16             if($user[0]->upass == $_POST['upass']){17                 echo '密码正确！';18                 $this->load->library('session');19                 $arr = array("uid" => $user[0]->usid);20                 $this->session->set_userdata($arr);21                 echo "<br />";22                 echo $this->session->userdata('uid');23             }24             else{25                 echo '密码不正确！';26             }27         }28         else{29             echo '用户名不存在';30         }31     }32 33     public function checksession(){34         $this->load->library('session');35         if($this->session->userdata('uid')){36             echo '已经登录。';37         }38         else{39             echo '没有登录。';40         }41     }42 43     public function loginout(){44         $this->load->library('session');45         $this->session->unset_userdata('uid');46     }47 }

 六.CI的分页功能demo

1.必须知道的一些参数

a.总共有多少条记录

b.一页要有多少条记录

c.总共多少页

d.当前页前后要显示多少个分页链接

2.设置一些CI分页类基本参数

//总条数

$config['total_rows']

//一页显示几条

$config['per_page']

//定义当前页的前后各有几个数字链接

$config['num_links']

//定义没有分页参数,主URL

$config['base_url']

3.调用CI的分页类

$this->load->library('pagination');

4.执行分页方法

$this->pagination->initialize($config);

5.输出分页链接

echo $this->pagination->create_links();

6.查询部分数据(limit)

echo $this->db->limit($num,$start);  //从$start查$num条

 1 ./applications/controllers/page.php 2 <?php  3 if ( ! defined('BASEPATH')) exit('No direct script access allowed'); 4  5 class Page extends CI_Controller { 6  7     public function user_add(){ 8         $this->load->model('test_m'); 9 10         for ($i = 1;$i <= 100;$i++){11             $name = 'u'.$i;12             $arr = array("usid"=>$i,"uname"=>$name,"upass"=>123456);13             $this->test_m->user_insert($arr);14 15         }16     }17 18     public function pagelist(){19         $this->load->model('test_m');20         $user = $this->test_m->user_select_all();21         $allnum = count($user);22         $pagenum = 20;23 24         $config['total_rows'] = $allnum;25         $config['per_page'] = $pagenum;26         $config['num_links'] = 3;27         $config['base_url'] = "/CI/index.php/page/pagelist";28         $config['use_page_numbers'] = true;29 30         $this->load->library('pagination');31         $this->pagination->initialize($config);32 33         var_dump($this->pagination->create_links());34         echo $this->pagination->create_links();35 36         echo "<br />";37         $id = $this->uri->segment(3);  //获得url第三段字符38         $id =$id ? $id:1;39         $start = ($id - 1) * $pagenum;40         $list = $this->test_m->user_select_limit($start,$pagenum);41         var_dump($list);42     }43 }