mysql查找附近的人，经纬度查询
经纬度排序
mysql函数
CREATE DEFINER=`root`@`localhost` FUNCTION `get_distance`(`lon1` float,`lat1` float,`lon2` float,`lat2` float) RETURNS double
begin
declare d double;
declare radius int;
set radius = 6378140; #假设地球为正球形，直径为6378140米
set d = (2*ATAN2(SQRT(SIN((lat1-lat2)*PI()/180/2)
*SIN((lat1-lat2)*PI()/180/2)+
COS(lat2*PI()/180)*COS(lat1*PI()/180)
*SIN((lon1-lon2)*PI()/180/2)
*SIN((lon1-lon2)*PI()/180/2)),
SQRT(1-SIN((lat1-lat2)*PI()/180/2)
*SIN((lat1-lat2)*PI()/180/2)
+COS(lat2*PI()/180)*COS(lat1*PI()/180)
*SIN((lon1-lon2)*PI()/180/2)
*SIN((lon1-lon2)*PI()/180/2))))*radius;
return d;
END
原生用法
select * from test where get_distance(13.66667,24.61667,longitude,latitude)<500000000;
select get_distance(13.66667,24.61667,longitude,latitude) AS d from test ORDER BY d asc;
严格模式
CREATE DEFINER=`root`@`localhost` FUNCTION `get_distance`(`lon1` float,`lat1` float,`lon2` float,`lat2` float) RETURNS int(11)
READS SQL DATA
begin
declare d INT;
declare radius int;
set radius = 6378140; #假设地球为正球形，直径为6378140米
set d = (2*ATAN2(SQRT(SIN((lat1-lat2)*PI()/180/2)
*SIN((lat1-lat2)*PI()/180/2)+
COS(lat2*PI()/180)*COS(lat1*PI()/180)
*SIN((lon1-lon2)*PI()/180/2)
*SIN((lon1-lon2)*PI()/180/2)),
SQRT(1-SIN((lat1-lat2)*PI()/180/2)
*SIN((lat1-lat2)*PI()/180/2)
+COS(lat2*PI()/180)*COS(lat1*PI()/180)
*SIN((lon1-lon2)*PI()/180/2)
*SIN((lon1-lon2)*PI()/180/2))))*radius;
return d;
END;
