ci 笔记
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 database 12 $this->load->database(); 13 //$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.php 2 <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 else 28 { 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 }