Heim > Backend-Entwicklung > PHP-Tutorial > ci框架(二),ci框架_PHP教程

ci框架(二),ci框架_PHP教程

WBOY
Freigeben: 2016-07-13 10:23:31
Original
931 Leute haben es durchsucht

ci框架(二),ci框架

自定义SQL语句                                                                            

当提供的API满足不了我们对SQL语句的要求的时候,我们通常是自己来写SQL语句,CI也提供了比较强大了,能够满足我们需求的一般的sql的API。

<span>$res</span>=<span>$this</span>->db->select('id,name'<span>)
    </span>->from('表名'<span>)
    </span>->whrer('id >=',5)<span>//</span><span>注意id后面要有个空格</span>
    ->limit(3,2<span>)<span>//这里与sql的limit是顺序是反的</span>
    </span>->order_by('id desc '<span>)
    </span>->get();<span>//</span><span>翻译成sql语句</span>
<span>var_dump</span>(<span>$res</span>-><span>result());
</span><span>echo</span> <span>$this</span>->db->last_query();<span>//</span><span>先是最近一条SQL</span>
Nach dem Login kopieren

自定义扩展控制器

在application/core中新建MY_Controller.php

<span>class</span> MY_Controller <span>extends</span><span> CI_Controller
{
    </span><span>public</span> <span>function</span><span> __construct()
    {
        parent</span>::<span>__construct();
        </span><span>//</span><span>一定呀先调用父类的构造方法
        //登录验证、权限验证、其他操作。。。</span>
<span>    }
}</span>
Nach dem Login kopieren

同时需要在application/config/config.php中配置一下:

<span>$config</span>['subclass_prefix'] = 'MY_';
Nach dem Login kopieren

自定义扩展模型

在application/models中创建user_model.php

<span>class</span> User_model <span>extends</span><span> CI_Model
{
    </span><span>public</span> <span>function</span><span> getAll()
    {
        </span><span>$res</span> = <span>$this</span>->db->get('表名'<span>);
        </span><span>return</span> <span>$res</span>-><span>result();
    }
}</span>
Nach dem Login kopieren

在控制器中调用自定义模型

application/controllers:

<span>class</span> User <span>extends</span><span> MY_Controller
{
    </span><span>public</span> <span>function</span><span> index()
    {
        </span><span>$this</span>->load->model('User_model');<span>//</span><span>调用以类名为主,而不是文件名</span>
Nach dem Login kopieren
<span>$list</span> = <span>$this</span>->User_model->getAll();<span>//</span><span>调用模型获取数据</span>
Nach dem Login kopieren
<span>$this</span>->load->view('user/index',<span>array</span>('list'=><span>$list</span>));<span>//</span><span>加载视图</span><span>  
    }   
}</span>
Nach dem Login kopieren

加载模型的时候可以给模型取一个名字:

<span>$this</span>->load->model('User_model','user');<span>//</span><span>调用以类名为主,而不是文件名        </span>
<span>$list</span> = <span>$this</span>->user->getAll();<span>//</span><span>调用模型获取数据</span>
Nach dem Login kopieren

Url相关函数

在表单验证的时候,需要把数据传给控制器,怎么准确的而且可扩展的写action呢,调用API:

<span>public</span> <span>function</span><span> addView()
{
    </span><span>$this</span>->load->helper('url');<span>//</span><span>为了不把表单传递的地址写死,用url函数</span>
    <span>$this</span>->load->view('user/add'<span>);
}</span>
Nach dem Login kopieren

在user/add.php视图当中:

<span><</span><span>form </span><span>action</span><span>="<?php echo site_url('user/insert'); ?>"</span><span> method</span><span>="post"</span><span>></span>
<span><!--</span><span> ........</span><span>--></span>
<span></</span><span>form</span><span>></span>
Nach dem Login kopieren

如果是index.php目录的话,用:

base_url();
Nach dem Login kopieren

这个API。

同时,每次加载url很麻烦,也可是设置成自动加载,在config/config.php中修改:

<span>$config</span>['helper'] = <span>array</span>('url');
Nach dem Login kopieren

可能在后面的版本中就没有这个自动加载了。

路由

ci框架(二),ci框架_PHP教程$route['rouxx/showxx/([\d]+)\.html'] = 'rou/show/$1';//插入这句话

ci框架(二),ci框架_PHP教程分页

  • 必须知道的一些参数

总共有多少条记录

一页要有多少条记录

总共多少页

当前页前后要显示多少个分页链接

  • 设置一些CI分页类基本参数
<span>//</span><span>总条数</span>
<span>$config</span>['total_rows'<span>]
</span><span>//</span><span>一页显示几条</span>
<span>$config</span>['per_page'<span>]
</span><span>//</span><span>定义当前页的前后各有几个数字链接</span>
<span>$config</span>['num_links'<span>]
</span><span>//</span><span>定义没有分页参数,主URL</span>
<span>$config</span>['base_url']
Nach dem Login kopieren
  • 调用CI的分页类
<span>$this</span>->load->library('pagination');
Nach dem Login kopieren
  • 执行分页方法
<span>$this</span>->pagination->initialize(<span>$config</span>);
Nach dem Login kopieren
  • 输出分页链接
<span>echo</span> <span>$this</span>->pagination->create_links();
Nach dem Login kopieren
  • 查询部分数据(limit)
<span>echo</span> <span>$this</span>->db->limit(<span>$num</span>,<span>$start</span>);  <span>//</span><span>从$start查$num条</span>
Nach dem Login kopieren
<?<span>php 
</span><span>if</span> ( ! <span>defined</span>('BASEPATH')) <span>exit</span>('No direct script access allowed'<span>);

</span><span>class</span> Page <span>extends</span><span> CI_Controller {

    </span><span>public</span> <span>function</span><span> user_add(){
        </span><span>$this</span>->load->model('test_m'<span>);

        </span><span>for</span> (<span>$i</span> = 1;<span>$i</span> <= 100;<span>$i</span>++<span>){
            </span><span>$name</span> = 'u'.<span>$i</span><span>;
            </span><span>$arr</span> = <span>array</span>("usid"=><span>$i</span>,"uname"=><span>$name</span>,"upass"=>123456<span>);
            </span><span>$this</span>->test_m->user_insert(<span>$arr</span><span>);

        }
    }

    </span><span>public</span> <span>function</span><span> pagelist(){
        </span><span>$this</span>->load->model('test_m'<span>);
        </span><span>$user</span> = <span>$this</span>->test_m-><span>user_select_all();
        </span><span>$allnum</span> = <span>count</span>(<span>$user</span><span>);
        </span><span>$pagenum</span> = 20<span>;

        </span><span>$config</span>['total_rows'] = <span>$allnum</span><span>;
        </span><span>$config</span>['per_page'] = <span>$pagenum</span><span>;
        </span><span>$config</span>['num_links'] = 3<span>;
        </span><span>$config</span>['base_url'] = "/CI/index.php/page/pagelist"<span>;
        </span><span>$config</span>['use_page_numbers'] = <span>true</span><span>;

        </span><span>$this</span>->load->library('pagination'<span>);
        </span><span>$this</span>->pagination->initialize(<span>$config</span><span>);

        </span><span>var_dump</span>(<span>$this</span>->pagination-><span>create_links());
        </span><span>echo</span> <span>$this</span>->pagination-><span>create_links();

        </span><span>echo</span> "<br />"<span>;
        </span><span>$id</span> = <span>$this</span>->uri->segment(3);  <span>//</span><span>获得url第三段字符</span>
        <span>$id</span> =<span>$id</span> ? <span>$id</span>:1<span>;
        </span><span>$start</span> = (<span>$id</span> - 1) * <span>$pagenum</span><span>;
        </span><span>$list</span> = <span>$this</span>->test_m->user_select_limit(<span>$start</span>,<span>$pagenum</span><span>);
        </span><span>var_dump</span>(<span>$list</span><span>);
    }
}</span>
Nach dem Login kopieren

上传文件

视图 /views/up.php:

<span><</span><span>html</span><span>></span>
    <span><</span><span>form </span><span>action</span><span>="ci/CodeIgniter_2.2.0/index.php/upload/up"</span><span> method</span><span>="post"</span><span> enctype</span><span>="multipart/form-data"</span><span>></span>
        <span><</span><span>input </span><span>type</span><span>="file"</span><span> name</span><span>="upfile"</span> <span>/></span>
        <span><</span><span>input </span><span>type</span><span>="submit"</span><span> name</span><span>="sub"</span><span> value</span><span>="提交"</span> <span>/></span>
    <span></</span><span>form</span><span>></span>
<span></</span><span>html</span><span>></span>
Nach dem Login kopieren

控制器:

  • 定义一个数组,设置一些与上传相关的参数
<span>$config</span>['upload_path'] = './uploads/'<span>;
</span><span>//</span><span>设置允许上传的类型</span>
<span>$config</span>['allowed_types'] = 'gif|jpg|png'<span>;
</span><span>$config</span>['max_size'] = '100'<span>;
</span><span>//</span><span>如果是图片还可以设置最大高度和宽度</span>
<span>$config</span>['max_height'] = 768<span>;
</span><span>$config</span>['max_width'] = 1024;
Nach dem Login kopieren

还可以设置其他的一些额外参数,详细看用户手册。

  • 调用CI的上传通用类,并执行上传
<span>//</span><span>upload为调用的类名,全小写</span>
<span>$this</span>->load->library('upload',<span>$config</span><span>);
</span><span>//</span><span>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</span>
<span>$this</span>->upload->do_upload('上传框的name');
Nach dem Login kopieren
  • 接收出错信息或成功信息
<span>//</span><span>出错信息</span>
<span>$error</span> = <span>array</span>('error' => <span>$this</span>->upload-><span>display_error());
</span><span>//</span><span>成功信息</span>
<span>$data</span> = <span>array</span>('upload_data' => <span>$this</span>->upload->data());
Nach dem Login kopieren
<?<span>php 
</span><span>if</span> ( ! <span>defined</span>('BASEPATH')) <span>exit</span>('No direct script access allowed'<span>);

</span><span>class</span> Upload <span>extends</span><span> CI_Controller {
    </span><span>//</span><span>显示带表单的视图</span>
    <span>public</span> <span>function</span><span> index(){
        </span><span>$this</span>->load->view('up'<span>);
    }
    </span><span>//</span><span>显示上传信息</span>
    <span>public</span> <span>function</span><span> up(){
        </span><span>$config</span>['upload_path'] = './uploads/'<span>;
        </span><span>$config</span>['allowed_types'] = 'gif|jpg|png'<span>;
        </span><span>$config</span>['max_size'] = "2000"<span>;
        </span><span>$this</span>->load->library('upload',<span>$config</span><span>);
        </span><span>//</span><span>打印成功或错误的信息</span>
        <span>if</span>(<span>$this</span>->upload->do_upload('upfile'<span>))
        {
            </span><span>$data</span> = <span>array</span>("upload_data" => <span>$this</span>->upload-><span>data());
            </span><span>var_dump</span>(<span>$data</span><span>);
        }
        </span><span>else</span><span>
        {
            </span><span>$error</span> = <span>array</span>("error" => <span>$this</span>->upload-><span>display_errors());
            </span><span>var_dump</span>(<span>$error</span><span>);
        }
    }
}</span>
Nach dem Login kopieren

Session

利用CI类实现session登录

  • 修改配置文件(config.php)
<span>//</span><span>生成一个随机不重复的字符串走位加密的key保存到config.php的encryption_key中</span>
<span>$config</span>['encryption_key']='adb8bf6d0ac4e17b42a80941582497a4';
Nach dem Login kopieren
  • 加载SESSION类
<span>$this</span>->load->library('session');
Nach dem Login kopieren
  • 创建SESSION
<span>$array</span> = <span>array</span>('id'=>3,'name'=>'jack'<span>);
</span><span>$this</span>->session->set_userdata(<span>$array</span>);
Nach dem Login kopieren
  • 查看SESSION
<span>$this</span>->session->userdata(session名);
Nach dem Login kopieren
  • 删除SESSION
<span>$this</span>->session->unset_userdata('SESSION名');
Nach dem Login kopieren

ci框架(二),ci框架_PHP教程$config['sess_cookie_name'] = 'ci_session'; $config['sess_expiration'] = 7200; $config['sess_expire_on_close'] = FALSE; $config['sess_encrypt_cookie'] = TRUE $config['sess_use_database'] = FALSE; $config['sess_table_name'] = 'ci_sessions'; $config['sess_match_ip'] = FALSE; $config['sess_match_useragent'] = TRUE; $config['sess_time_to_update'] = 300;

  • 一次性数据,只能读取一次
<span>//</span><span>设置</span>
<span>$this</span>->session->set_flashdata('test','aaaaa'<span>);
</span><span>//</span><span>读取</span>
<span>$test</span> = <span>$this</span>->session->flashdata('test');
Nach dem Login kopieren

php CI 框架怎从数据库中取值(一个二维数组)以表格的形式显示到view层

控制层
function test_func(){
//获取model页面需要的两个参数
$competition_id = $_GET["competition_id"];
$report_class = $_GET["report_class"];
$this->load->model("Action"); //引入model
$data["head"] = $this->Action->get_report_item($competition_id, $report_class); //引用model的函数
$this->load->view("test_result",$data); //将结果显示在test_result.php页面中
}
view层:


添加结果显示
//此处选择了循环输出从控制层传输的结果




字段名称(含义) //该td中显示的是你从数据库、即model层中获取到的数据的含义,想显示多少,显示哪个,在这里确认


test; ?>


echo “123”;
}?>

 

php CI框架问题?小弟是初学者

在view文件里可以直接用$title了
是 CI 根据$data里的每一个可以声明了一个变量 到view中可以直接调用
CI 架构就是这么干活的 具体怎么去声明的 没太细看
 

www.bkjia.comtruehttp://www.bkjia.com/PHPjc/838913.htmlTechArticleci框架(二),ci框架 自定义SQL语句 当提供的API满足不了我们对SQL语句的要求的时候,我们通常是自己来写SQL语句,CI也提供了比较强大了...
Verwandte Etiketten:
Quelle:php.cn
Erklärung dieser Website
Der Inhalt dieses Artikels wird freiwillig von Internetnutzern beigesteuert und das Urheberrecht liegt beim ursprünglichen Autor. Diese Website übernimmt keine entsprechende rechtliche Verantwortung. Wenn Sie Inhalte finden, bei denen der Verdacht eines Plagiats oder einer Rechtsverletzung besteht, wenden Sie sich bitte an admin@php.cn
Beliebte Tutorials
Mehr>
Neueste Downloads
Mehr>
Web-Effekte
Quellcode der Website
Website-Materialien
Frontend-Vorlage