ci framework (2), ci framework_PHP tutorial-PHP Tutorial-php.cn

ci framework (2), ci framework

Custom SQL statement When the provided API cannot meet our requirements for SQL statements, we usually write SQL statements ourselves. CI also provides a relatively powerful general SQL API that can meet our needs.

<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>

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Custom expansion controller

Create a new MY_Controller.php in application/core At the same time, you need to configure it in application/config/config.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>

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Custom extension model

Create user_model.php in application/models

<span>$config</span>['subclass_prefix'] = 'MY_';

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Call custom model in controller application/controllers:

When loading the model, you can give the model a name:

<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>

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Url related function

<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>

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During form verification, data needs to be passed to the controller. How to write actions accurately and scalably? Call the API:

<span>$list</span> = <span>$this</span>->User_model->getAll();<span>//</span><span>调用模型获取数据</span>

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<span>$this</span>->load->view('user/index',<span>array</span>('list'=><span>$list</span>));<span>//</span><span>加载视图</span><span>  
    }   
}</span>

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In the user/add.php view:

<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>

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If it is the index.php directory, use: This API.

At the same time, loading the URL every time is very troublesome. You can also set it to load automatically and modify it in config/config.php:

<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>

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This automatic loading may not be available in later versions.

<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>

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Routing 🎜>

base_url();

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$route

['rouxx/showxx/([d]+).html'] = 'rou/show/$1';

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

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Insert this sentence

<页> Pagling

Some parameters you must know

ci framework (2), ci framework_PHP tutorial How many records are there in total How many records should be on one page How many pages in total How many pagination links should be displayed before and after the current page

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']

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调用CI的分页类

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

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执行分页方法

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

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输出分页链接

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

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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>

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<?<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>

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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>

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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;

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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');

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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());

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<?<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>

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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';

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加载SESSION类

<span>$this</span>->load->library('session');

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创建SESSION

<span>$array</span> = <span>array</span>('id'=>3,'name'=>'jack'<span>);
</span><span>$this</span>->session->set_userdata(<span>$array</span>);

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查看SESSION

<span>$this</span>->session->userdata(session名);

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删除SESSION

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

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ci framework (2), ci framework_PHP tutorial $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');

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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：