How to get distance from latitude and longitude from mysql Address table which have latitude and longitude

Question

 $distance = DB::select(
                DB::raw("
                SELECT a.distance
                FROM ( SELECT user_id, street, store_name,
                    (
                        '".$mean_radius_of_Earth."' * 
                        acos(cos(radians('".$latitude."')) * 
                        cos(radians(latitude)) * 
                        cos(radians(longitude) - 
                        radians('".$longitude."')) + 
                        sin(radians('".$latitude."')) * 
                        sin(radians(latitude)))
                    ) AS distance
                    FROM addresses ) AS a
                    WHERE id= '". $address_id."' 

                ")
            );

I have to get all the column of the particular row using this address_id which is the primary key but i am getting the error:- Column not found: 1054 Unknown column 'id' in 'where clause' but when i am trying to achieve that with user_id then i am getting that all fields data ,user_id(which is not primary_key) your help will be much appreciated, thanks in Advance and sorry for the improper english

Answer 1

You don't select id in your subrequest so or you make the select in the subquery or you select the field id in your subselect:

$distance = DB::select(
            DB::raw("
            SELECT a.distance
            FROM ( SELECT user_id, street, store_name,
                (
                    '".$mean_radius_of_Earth."' * 
                    acos(cos(radians('".$latitude."')) * 
                    cos(radians(latitude)) * 
                    cos(radians(longitude) - 
                    radians('".$longitude."')) + 
                    sin(radians('".$latitude."')) * 
                    sin(radians(latitude)))
                ) AS distance
                FROM addresses 
                WHERE id= '". $address_id."') AS a                    

            ")
        );

Answer 2

In situation like this I would leverage the power of Eloquent's Appends functionality.

In your situation it might look a little like the following,

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class User extends Model
{
    /**
     * The accessors to append to the model's array form.
     *
     * @var array
     */
    protected $appends = ['distance'];

    /**
     * Get the distance for the user.
     *
     * @return int
     */
    public function getDistanceAttribute()
    {
        $distance = // Crazy math for distance insert here

        // To get address long and lat stored in separate database 
        // I would eager load them in the query call and then in this 
        // function you'd already have the values ready to go in memory
        $distance = $this->address->long...

        return $distance;
    }
}

The beauty of this solution is you can leverage Eloquent's querying, prevent SQL injection messes, and keep things tied to your Model not the query.

use App\User;

foreach(User::all() as $user) {
    echo $user->distance; // Print's out the distance you wanted
}

echo User::where('id', '=', $address_id)->first()->distance; // Prints out specific user's distance.