How to use raw sql Pagination in Laravel5? - php

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);
}