sqlでlatとlongを使用して距離を見つける

Question

10キロメートル以内の任意の場所を検索したい緯度と経度を使用します。私はどのように制限を設定できますか？ここに私のSQLクエリは次のとおりです。

$this->db->select(", (6371 acos(cos(radians(37)) cos(radians(latitude)) cos(radians(longtitude)- radians($lng)) + sin(radians($lat)) * sin(radians(latitude)))) AS distance");       
$this->db->from('table_name'); 
$this->db->order_by('distance'); 

Answer 1

Try this: 
$this->db->select(", (6371 acos(cos(radians(37)) cos(radians(latitude)) cos(radians(longtitude)- radians($lng)) + sin(radians($lat)) * sin(radians(latitude)))) AS distance");       
$this->db->from('table_name'); 
$this->db->having('distance<',10) 
$this->db->order_by('distance'); 

Answer 2

はこれを試してみてください：

$this->db->query(' SELECT (6371 * acos(cos(radians(37)) cos(radians(latitude)) cos(radians(longtitude)- radians("'.$lng.'")) + sin(radians("'.$lat.'")) * sin(radians(latitude)))) AS distance 
         FROM table_name 
         HAVING distance < 10 
         ORDER BY distance ASC'); 

Answer 3

$sql = 'select *,(((acos(sin(('.$lat.'*pi()/180)) * 
      sin((loc_LAT_centroid*pi()/180))+cos(('.$lat.'*pi()/180)) * 
      cos((loc_LAT_centroid*pi()/180)) * cos((('.$lang.'-loc_LONG_centroid)* 
      pi()/180))))*180/pi())*60*1.1515 
     ) AS distance from table_name order by distance'; 

$lat = latitude of your current location 
$lang = longitude of your current location 

loc_LAT_centroid = field name of your table where you store the latitude of the places. 
loc_LONG_centroid = field name of your table where you store the longitude of the places.