[CI]CodeIgniter Rapid Development Guide

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The strongest feeling since using CI is its thorough MVC design. For example: In the application/modesl directory, write our model operations and uniformly inherit CI_Model.

Only logic is written in the controller, and the database cannot be directly operated. Data is required to directly call the model, and finally the template is called.

The collaboration between models, controllers, and views are shown below.

<span>/*</span><span>*
 * 用户模型, 完整CURD示例
 * @Chenwei
 </span><span>*/</span>
<span>class</span> User_model <span>extends</span><span> CI_model<br>{
    </span><span>public</span> <span>function</span><span> __construct()
    {
        parent</span>::<span>__constrcut();
    }

    </span><span>/*</span><span>*
     * 查询用户信息, 这里不建议使用单一id参数作为条件, 为了便于控制器自己组装条件复用此模型方法
     * @param array 格式如: $where = array('id'=>1);
     * @return array
     </span><span>*/</span>
    <span>public</span> <span>function</span> userInfo(<span>$where = array()</span><span>)
    {
        </span><span>if</span>(<span>$where</span> && <span>is_array</span>(<span>$where</span><span>))
        {
            </span><span>$res</span> = <span>$this</span>->db->select('id, username, age')->where(<span>$where</span>)->get('users'<span>);

            </span><span>return</span> <span>$res</span>->result_array(); <span>//</span><span>以二维数组形式返回结果</span>
<span>        }
        </span><span>else</span><span>
        {<br>　　　　　　　$res = $this->db->select('id, username, age')->get('users');<br>
            </span><span>return</span> <span>$res->result_array()</span><span>;
        }
    }

    </span><span>/*</span><span>*
     * 添加用户
     * @param array 格式如: $data = array('username'=>'Chenwei', 'age'=>'18');
     * @reteurn bool
     </span><span>*/</span>
    <span>public</span> <span>function</span> userAdd(<span>$data</span><span>)
    {
        </span><span>if</span>(<span>$data</span> && <span>is_array</span>(<span>$data</span><span>))
        {
            </span><span>$bool</span> = <span>$this</span>->db->insert('users', <span>$data</span><span>);

            </span><span>return</span> <span>$bool</span><span>;
        }
        </span><span>else</span><span>
        {
            </span><span>return</span> <span>false</span><span>;
        }
    }

    </span><span>/*</span><span>*
     * 删除用户
     * @param int $id
     * @reteurn bool
     </span><span>*/</span>
    <span>public</span> <span>function</span> userDel(<span>$id</span><span>)
    {
        </span><span>if</span>(<span>$id</span><span>)
        {
            </span><span>$where</span> = <span>array</span>('id'=><span>$id</span><span>);

            </span><span>$bool</span> = <span>$this</span>->db->where(<span>$where</span>)->delete('users'<span>);

            </span><span>return</span> <span>$bool</span><span>;
        }
        </span><span>else</span><span>
        {
            </span><span>return</span> <span>false</span><span>;
        }
    }

    </span><span>/*</span><span>*
     * 修改用户
     * @param array $where 条件
     * @param array $data 新数据
     * @reteurn bool
     </span><span>*/</span>
    <span>public</span> <span>function</span> userEdit(<span>$where</span>, <span>$data</span><span>)
    {
        </span><span>if</span>(<span>$where</span> && <span>is_array</span>(<span>$where</span><span>))
        {
            </span><span>$bool</span> = <span>$this</span>->db->where(<span>$where</span>)->update('users', <span>$data</span><span>);

            </span><span>return</span> <span>$bool</span><span>;
        }
        </span><span>else</span><span>
        {
            </span><span>return</span> <span>false</span><span>;
        }
    }
}

</span><span>/*</span><span>*
 * 几点注意:
 * 1. 模型类名字User_model首字母大写, 其余字母小写, 继承基础模型类CI_Model
 * 2. 类文件名 application/models/user_model.php
 * 3. 控制器中如何载入此模型 : <br>　　　　$this->load->model('User_model', 'user'); 这是以user为对象名引入;<br>　　　　$this->load->model('User_model'); 这是默认以User_model为对象名引入. 模型文件支持子目录;<br>　　　　如果类文件在application/models/blog/user_model.php中, 可以这样引入: $this->load->model('blog/User_model');
 * 4. 如果有需要, 你可以设置自动加载, 在 application/config/autoload.php文件中.<br> * 5. 如果没有设置自动连接数据库, 加在模型的时候可以设置连接, 像这样 $this->load->model('User_model', '', TRUE);
 </span><span>*/<br>Ps:<br>这里是一个联合查询的例子, 有需要可以尝试:<br>$res = $this->db->select('p.id, p.uid, p.order_no, p.amount, p.pay_way, p.pay_type, p.pay_bank, p.pay_time, p.goods_type, p.contact_tel, p.detail_desc, p.add_time, u.username')->from('payment as p')->join('users as u', 'p.uid = u.id')->order_by('p.id', 'desc')->get();</span>

<span>/*</span><span>*
 * 用户控制器, CURD示例
 * @Chenwei
 </span><span>*/</span>
<span>class</span> Users <span>extends</span><span> CI_Controller
{
    </span><span>public</span> <span>function</span><span> __construct()
    {
        parent</span>::<span>__construct();

        </span><span>$this</span>->load->model('User_model', 'user'<span>);
    }
    
    </span><span>/*</span><span>*
     * 用户列表
     </span><span>*/</span>
    <span>public</span> <span>function</span><span> index()
    {
        </span><span>$data</span>['user_list'] = <span>$this</span>->user-><span>userInfo();

        </span><span>$this</span>->load->view('user_list', <span>$data</span><span>);　　//调用模板, 并将数据输出到前台
    }

    </span><span>/*</span><span>*
     * 添加用户
     </span><span>*/</span>
    <span>public</span> <span>function</span><span> user_add()
    {
        </span><span>$data</span> = <span>array</span><span>(
            </span>'username'=><span>$this</span>->input->post('name'<span>);
            </span>'age'=><span>intval</span>(<span>$this</span>->input->post('age'<span>));
        );

        </span><span>$bool</span> = <span>$this</span>->user->userAdd(<span>$data</span><span>);

        </span><span>if</span>(<span>$bool</span><span>)
        {
           </span><span>$this</span>->show_tips('操作成功 !'<span>);
        }
        </span><span>else</span><span>
        {
            </span><span>$this</span>->show_tips('操作失败 !'<span>);
        }
    }

    </span><span>/*</span><span>*
     * 修改用户
     </span><span>*/</span>
    <span>public</span> <span>function</span><span> user_edit()
    {
        </span><span>$id</span> = <span>$this</span>->input->post('id'<span>);

        </span><span>$data</span> = <span>array</span><span>(
            </span>'username'=><span>$this</span>->input->post('name'<span>);
            </span>'age'=><span>intval</span>(<span>$this</span>->input->post('age'<span>));
        );

        </span><span>if</span>(<span>$id</span><span>)
        {<br>　　　　　　　$where = array('id'=>$id);<br>
            </span><span>$bool</span> = <span>$this</span>->user->userEdit(<span>$where</span>, <span>$data</span><span>);

            </span><span>if</span>(<span>$bool</span><span>)
            {
               </span><span>$this</span>->show_tips('操作成功 !'<span>);
            }
            </span><span>else</span><span>
            {
                </span><span>$this</span>->show_tips('操作失败 !'<span>);
            }
        }
        </span><span>else</span><span>
        {
            </span><span>$this</span>->show_tips('非法操作 !'<span>);
        }
    }

    </span><span>/*</span><span>*
     * 删除用户
     </span><span>*/</span>
    <span>public</span> <span>function</span><span> user_del()
    {
        </span><span>$id</span> = <span>$this</span>->input->post('id'<span>);

        </span><span>$bool</span> = <span>$this</span>->user->userDel(<span>$id</span><span>);

        </span><span>if</span>(<span>$bool</span><span>)
        {
           </span><span>$this</span>->show_tips('操作成功 !'<span>);
        }
        </span><span>else</span><span>
        {
            </span><span>$this</span>->show_tips('操作失败 !'<span>);
        }
    }
}

</span><span>/*</span><span>*<br> * 几点注意:
 * 1. 控制器文件在 application/controller/users.php , 支持子目录
 * 2. 控制器名首字母必须大写, 且必须继承CI_Controller
 * 3. 前后台权限控制都在application/core/MY_Controller.php文件中,<br>　　　　定义两个控制器, 分别用于前台和后台, 继承CI_Controller , 其余都只需继承这两个自定义的控制器即可.
 * 4. 定义默认控制器, 在 application/config/route.php
 </span><span>*/</span>

<span>/*</span><span>*
 * 视图层 示例
 * @Chenwei
 </span><span>*/</span>
<?<span>php
    </span><span>$this</span>->load->view('header'<span>);
</span>?>

<!-- 简单的输出 -->
<div>
    <table>
        <?php <span>if</span>(<span>$user_list</span>):?>
            <?php <span>foreach</span>(<span>$user_list</span> <span>as</span> <span>$v</span>):?>
            <tr><td><?=<span>$v</span>['username'];?></td></tr>
            <?php <span>endforeach</span>;?>
        <?php <span>endif</span>;?>
    </table>
</div>

<?<span>php
    </span><span>$this</span>->load->view('header'<span>);
</span>?>

<span>/*</span><span>*
 * 几点注意:
 * 1. 模板中可以直接使用控制器中分配的变量, 使用CI系统的所有函数和方法.
 * 2. 开启CI短标签支持后, 即使php未开启支持, CI也会帮我们自动解析, 可以放心使用.
 </span><span>*/</span>

There may be manual errors, please do not copy and use the above code directly; for more practical usage of CI, you can consult the CI manual at any time.

Link: http://www.cnblogs.com/farwish/p/3991419.html

@黑eyedpoet　

The above introduces the [CI]CodeIgniter Rapid Development Guide, including various aspects. I hope it will be helpful to friends who are interested in PHP tutorials.