如何使用laravel DB :: select查询分页

Question

我正在使用Laravel中的一个项目并使用DB facade来运行sql的原始查询.在我的情况下,我使用DB :: select,问题是分页方法不能使用此DB原始查询并显示此错误

Call to a member function paginate() on array

我只想要如何用DB原始查询实现laravel分页这里是我的代码:

<?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

尝试:

$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！对您的 sql 使用限制和偏移量，并将其余部分留给数据库服务器。另外为您的语句使用单独的计数选择。

数数：

$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\n在控制器中首次使用

\n

use Illuminate\\Pagination\\Paginator;\n

\n

然后在函数中

\n

$query =  DB::select(DB::raw("SELECT pro.* , (SELECT TIMESTAMPDIFF(DAY,updated_at,'$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"));\n\n     \n$page1 = new Paginator($query, $maxPage);\n\ndd($page1);\n

\n

欧/普 =>

\n

Paginator {#1450 \xe2\x96\xbc\n  #hasMore: true\n  #items: Collection {#1509 \xe2\x96\xbc\n    #items: array:10 [\xe2\x96\xbc\n      0 => {#1454 \xe2\x96\xb6}\n      1 => {#1455 \xe2\x96\xb6}\n      2 => {#1456 \xe2\x96\xb6}\n      3 => {#1457 \xe2\x96\xb6}\n      4 => {#1458 \xe2\x96\xb6}\n      5 => {#1459 \xe2\x96\xb6}\n      6 => {#1460 \xe2\x96\xb6}\n      7 => {#1461 \xe2\x96\xb6}\n      8 => {#1462 \xe2\x96\xb6}\n      9 => {#1463 \xe2\x96\xb6}\n    ]\n  }\n  #perPage: 10\n  #currentPage: 1\n  #path: "/"\n  #query: []\n  #fragment: null\n  #pageName: "page"\n  +onEachSide: 3\n  #options: []\n

\n