laravel database opearate1

        //get whole table data
        // $users = DB::table(‘users‘)->get();
        // var_dump($users);

        // select data of ‘id=1‘;
        // $me = DB::table(‘users‘)->where(‘id‘,1)->first();
        // echo $me->name;

        // out one filed
        // $email = DB::table(‘users‘)->where(‘id‘,2)->value(‘name‘);
        // var_dump($email);

        // select a list of cloumn
        // $names = DB::table(‘users‘)->pluck(‘email‘);
        // foreach ($names as $name => $value) {
        //  echo $name.$value.‘<br>‘;
        // }

        // oop!error.
        // DB:table(‘users‘)->orderBy(‘id‘)->chunk(1,function($users){
        //      foreach ($users as $key => $value) {
        //          echo $key.$value.‘<br>‘;
        //      }
        // });

       // count,max,min
        // $count = DB::table(‘users‘)->count();
        // echo $count;
        // $max = DB::table(‘users‘)->max(‘name‘);
        // echo $max;

        // exist or not exist exist return 1 not exist empty
        // $existsornot = DB::table(‘users‘)->where(‘id‘,2)->exists();
        // echo $existsornot;

        // select specify flied
        // $me = DB::table(‘users‘)->select(‘name‘,‘email‘)->get();
        // echo $me;

Reference: https://laravel.com/docs/5.7/queries

原文地址：https://www.cnblogs.com/cyany/p/10126303.html