如何在 Laravel5 中使用原始 sql 分页？

Question

This is my Controller code:

$sql = "SELECT *,earth_distance(ll_to_earth(team.lat, team.lng), ll_to_earth(23.1215939329,113.3096030895)) AS distance FROM team where earth_box(ll_to_earth(23.1215939329,113.3096030895),1000) @> ll_to_earth(team.lat, team.lng); ";
$result = DB::select( \DB::raw( $sql ) );

How can I add pagination to this code to build my restful api?

iOS or android will send the "next page" parameter, how to use it and find the next section data?

Answer 1

As far as I know you can't paginate raw query, here's why:

$result = DB::select($sql); 

$result here will have the array type and paginate() is the method from the Illuminate\\Database\\Query\\Builder class.

Your case can be performed this way:

$items = DB::table('team')   
    ->selectRaw('SELECT *,earth_distance(ll_to_earth(team.lat, team.lng), ll_to_earth(23.1215939329,113.3096030895)) AS distance')
    ->whereRaw('earth_box(ll_to_earth(23.1215939329,113.3096030895),1000) @> ll_to_earth(team.lat, team.lng)')
    ->paginate(10);

foreach($items as $item) {
    echo $item->distance;
}

As you can see minimal effort is needed here to separate raw query to selectRaw() and whereRaw() methods.

Answer 2

Another option if you are trying to paginate dynamic columns that maybe you were processing calculations on for reporting is to create a sort method and pass in your array and params:

public function sort($array_of_objects, $sort_by=null, $order, $page) 
{
    $collection = collect($array_of_objects);
    if ($sort_by)
    {

        if ($order=='desc') {
            $sorted = $collection->sortBy(function($role) use ($sort_by)
            {
                return $role->{$sort_by};
            })->reverse();
        } else if ($order=='asc') {
            $sorted = $collection->sortBy(function($role) use ($sort_by)
            {
                return $role->{$sort_by};
            });
        }
    } else {
        $sorted = $collection;
    }

    $num_per_page = 20;
    if (!$page) {
        $page = 1;
    }

    $offset = ( $page - 1) * $num_per_page;
    $sorted = $sorted->splice($offset, $num_per_page);

    return  new Paginator($sorted, count($array_of_objects), $num_per_page, $page);

}