laravel基础

1.laravel数据库原生，增、删、改、查、和高级查询

1.1 laravel路由代码：

<?php
use App\Http\Controllers\Home;
use Illuminate\Support\Facades\Route;
/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/
Route::get('/', function () {
    //echo date('Y-m-d H:i:s');
    return view('welcome');//视图，视图引擎blade
    //return view('test');
});
/*Route::get('/article/p/aaa',function(){
    return 'php.cn';
});*/
Route::get('/home/index','Home@index');
Route::get('/admins/article/lists','admins\Article@lists');
Route::get('/dbselect','Home@get');
Route::get('/dbupdate','Home@test_updateadafd');
Route::get('/dbinsert','Home@insert_mytest');
Route::get('/dbdelete','Home@delete_asdf');
Route::get('/dbfinds','Home@finds');

1.2 laravel控制器代码：

<?php
//1.命名空间：和目录对应
//2.类名称和文件文件名称一致
namespace App\Http\Controllers;
use Illuminate\Support\Facades\DB;
class Home extends Controller{
    public function index(){
        //return 'www.php.cn';
        $time = date('Y-m-d H:i:s');
        $res = DB::select('select * from article');
        $lists = [];
        foreach($res as $val){
            $lists[] = (array)$val;
        }
        $data['result'] = $lists;
        // echo '<pre>';
        // print_r($data);
        return view('test',$data);
        // return view('test')->with('time',$time)->with('name','laravel应用程序');
    }
    //数据库查询[原生查询]
   public function get(){
     //select * from article
     $res = DB::select('select * from article where id>3');
     echo '<pre>';
     print_r($res);
   }
   //数据库更新操作【原生更新】
   public function test_updateadafd(){
       $res = DB::update('update article set title="最污技术，我竟然秒懂" where id=3');
       var_dump($res);
   }
   //新增数据[原生新增]
   public function insert_mytest(){
       $res = DB::insert('insert article(`id`,`title`)values(5,"excel鼠标上下失灵")');
       var_dump($res);
   }
   //删除数据【原生删除】
   public function delete_asdf(){
      $res = DB::delete('delete from article where id=2');
       var_dump($res);
   }
   //高级数据库查询方法【链式调用】
   public function finds(){
      $res = DB::table('article')->where('id',3)->first();
      echo '<pre>';
      print_r($res);
   }
}

1.2 laravel视图代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" type="text/css" href="/layui/css/layui.css">
    <title>Document</title>
</head>
<body>
   <table class="layui-table">
       <thead>
           <tr>
               <td>ID</td>
               <td>标题</td>
           </tr>
       </thead>
       <tbody>
           <?php foreach($result as $val){?>
           <tr>
               <td><?php echo $val['id']?></td>
               <td><?php echo $val['title']?></td>
           </tr>
        <?php }?>
       </tbody>
   </table>
</body>
</html>
<?php
namespace App\Http\Controllers\admins;
use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
class Article extends Controller
{
   public function lists(){
       echo '后台文章';
   }
}