数据库的基本CURD操作（增、删、改、查）

Sian

IndexController.class.php

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<?php namespace Models\Controller; use Think\Controller; class IndexController extends Controller {     public function index(){         $this->add('sian');         $this->listUser();         $this->updateUserName(1, 'sian1');         $this->listUser();         $this->deleteUser(1);         $this->listUser();         $this->showUser(1);     }     // 增加一条数据     private function add($username){                   $userAttribute = array(             'username' => $username,         );         D('User')->add($userAttribute);     }     // 列出所有数据     private function listUser(){         dump(D('User')->select());     }     // 更新某条数据     private function updateUserName($userId, $userName){         $userAttribute = array(             'id'       =>    $userId,             'username' =>    $userName,         );         D('User')->save($userAttribute);     }     // 删除某个用户（id）     private function deleteUser($userId){         D('User')->delete($userId);     }     // 显示某个用户（id）     private function showUser($userId){         dump(D('User')->find($userId));     } }