[CI]CodeIgniter快速开发指南

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使用CI以来最强烈的感受是其彻底的MVC设计, 举个例子 : 在application/modesl目录里, 写我们的模型操作, 统一继承CI_Model.

而在控制器里只写逻辑, 无法直接操作数据库, 需要数据直接调用模型, 最后是调用模板.

下面分别展示模型, 控制器, 和视图间的协作.

<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>$user_list</span>):?>
            <?php <span>foreach(<span>$user_list</span> <span>as</span> <span>$v</span>):?>
            <tr><td>=<span>$v</span>['username'];?></td></tr>
            <?php <span>endforeach;?>
        <?php <span>endif;?>
    </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>

可能存在手误, 以上Code不要直接复制使用; 更多CI的实用用法, 可以随时去查阅CI手册.

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

@黑眼诗人　

以上就介绍了[CI]CodeIgniter快速开发指南，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。