如何在 laravel DB::select 查询中使用分页

Question

我正在 Laravel 中开展一个项目，并使用 DB 外观来运行 sql 的原始查询。 就我而言，我使用的是 DB::select，问题是分页方法不适用于此 DB 原始查询并显示此错误

Call to a member function paginate() on array

我只想如何使用 DB 原始查询实现 laravel 分页 这是我的代码：

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Notice;
use Illuminate\Support\Facades\DB;
use Illuminate\Pagination\Paginator;
use Illuminate\Pagination\LengthAwarePaginator;

class NoticeController extends Controller
{

public function index(){

    $notices = DB::select('select 
notices.id,notices.title,notices.body,notices.created_at,notices.updated_at,
    users.name,departments.department_name
    FROM notices
    INNER JOIN users ON notices.user_id = users.id
    INNER JOIN departments on users.dpt_id = departments.id
    ORDER BY users.id DESC')->paginate(20);

    $result = new Paginator($notices,2,1,[]);

    return view('welcome')->with('allNotices', $notices);
 }
}

Answer 1

public function index(Request $request){

$notices = DB::select('select notices.id,notices.title,notices.body,notices.created_at,notices.updated_at,
users.name,departments.department_name
FROM notices
INNER JOIN users ON notices.user_id = users.id
INNER JOIN departments on users.dpt_id = departments.id
ORDER BY users.id DESC');

$notices = $this->arrayPaginator($notices, $request);

return view('welcome')->with('allNotices', $notices);

}

public function arrayPaginator($array, $request)
{
    $page = Input::get('page', 1);
    $perPage = 10;
    $offset = ($page * $perPage) - $perPage;

    return new LengthAwarePaginator(array_slice($array, $offset, $perPage, true), count($array), $perPage, $page,
        ['path' => $request->url(), 'query' => $request->query()]);
}

Answer 2

试试：

$notices = DB::table('notices')
        ->join('users', 'notices.user_id', '=', 'users.id')
        ->join('departments', 'users.dpt_id', '=', 'departments.id')
        ->select('notices.id', 'notices.title', 'notices.body', 'notices.created_at', 'notices.updated_at', 'users.name', 'departments.department_name')
        ->paginate(20);

Answer 3

永远不要在 php 端使用分页逻辑！ 在您的 sql 上使用 limit 和 offset 并将其余部分留给数据库服务器。 额外为您的语句使用单独的计数选择。

计数：

$sql_count = 'SELECT count(1) cnt FROM ('. $sql . ') x';
$result = \DB::select( DB::raw($sql_count) );
$data['count'] = $result[0]->cnt;

结果：

$sql .= ' LIMIT ' . $offset . ', ' . $limit; 

$result = \DB::select( DB::raw($sql) );
$myPaginator = new \Illuminate\Pagination\LengthAwarePaginator($result, $data['count'], $limit, $page, ['path' => action('MyController@index')]);
$data['result'] = $result;

Answer 4

这个适合我

$sql = "some sql code";

$page = 1;
$size = 10;
$data = DB::select($sql);
$collect = collect($data);

$paginationData = new LengthAwarePaginator(
                         $collect->forPage($page, $size),
                         $collect->count(), 
                         $size, 
                         $page
                       );

Answer 5

它对我有用，请参阅 首先在你的控制器中使用

use Illuminate\Pagination\Paginator;

然后在函数中

$query =  DB::select(DB::raw("SELECT pro.* , (SELECT TIMESTAMPDIFF(DAY,updated_at,'$current_date') from users as u where u.id=pro.id) as days FROM users as pro where role_id = 6 and delete_status=0 and user_status = 'A' and approved_status = 1 and is_clever_courier = 1 having days >= 5"));

     
$page1 = new Paginator($query, $maxPage);

dd($page1);

o/p =>

Paginator {#1450 ▼
  #hasMore: true
  #items: Collection {#1509 ▼
    #items: array:10 [▼
      0 => {#1454 ▶}
      1 => {#1455 ▶}
      2 => {#1456 ▶}
      3 => {#1457 ▶}
      4 => {#1458 ▶}
      5 => {#1459 ▶}
      6 => {#1460 ▶}
      7 => {#1461 ▶}
      8 => {#1462 ▶}
      9 => {#1463 ▶}
    ]
  }
  #perPage: 10
  #currentPage: 1
  #path: "/"
  #query: []
  #fragment: null
  #pageName: "page"
  +onEachSide: 3
  #options: []

Answer 6

在尝试了这么多事情之后，我找到了解决方案，并且对我来说效果很好，也许对其他人会有所帮助。

首先，在 PHP 类中使用 Illuminate\Pagination\LengthAwarePaginator:

use Illuminate\Pagination\LengthAwarePaginator;

public function index(Request $request) {
    $notices = DB::select('SELECT notices.id, notices.title, notices.body, notices.created_at, notices.updated_at, users.name,departments.department_name
    FROM notices
    INNER JOIN users ON notices.user_id = users.id
    INNER JOIN departments on users.dpt_id = departments.id
    ORDER BY users.id DESC');
    
    $notices = $this->arrayPaginator($notices, $request);
    
    return view('welcome')->with('allNotices', $notices);
}
    
public function arrayPaginator($array, $request) {
        $page = Input::get('page', 1);
        $perPage = 10;
        $offset = ($page * $perPage) - $perPage;

        return new LengthAwarePaginator(
            array_slice(
                $array,
                $offset,
                $perPage,
                true
            ),
            count($array),
            $perPage,
            $page,
            ['path' => $request->url(), 'query' => $request->query()]
        );
}