laravel 查询语句

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use DB;
class UserController extends Controller
{

function index(){
$msg['status'] = 'success';
$msg['errorcode'] = 200;
$msg['msg'] = 'ok';
echo json_encode($msg);
}

function test2(){
$card = DB::select("select goods_id,cat_id,goods_name from goods");
//去除满足条件的第一条
$ca = DB::table("users")->where('address_id',">","1")->first();
//取出满足所有条件的内容
$cd = DB::table("users")->where('address_id','>',"1")->get();
//返回满足条件的user_name字段的内容
$cf = DB::table("users")->where("address_id",">","1")->pluck("user_name");
//返回一个组合值"232059cb5361a9336ccf1b8c2ba7657a" => "vip3"
$ch = DB::table("users")->where("address_id",">","1")->pluck("user_name",'password');
// 指定查询自居 查询用户名和密码
$cj = DB::table("users")->select("user_name","password")->get();
dd($cj);
}

function show(){
$id = 1;
return view('User.profile',['User'=>User::findOrfail($id)]);
}
};