使用MySQL的geometry类型处理经纬度距离问题的方法

CREATE TABLE `map` (
 `id` int(11) NOT NULL,
 `address` varchar(255) NOT NULL DEFAULT '',
 `location` geometry NOT NULL,
 PRIMARY KEY (`id`),
 SPATIAL KEY `idx_location` (`location`)
)

INSERT INTO map (id, address, location) VALUES (1, 'somewhere', ST_GeomFromText('POINT(121.366961 31.190049)'));

SELECT address, ST_AsText(location) AS location FROM map;

SELECT ST_Distance_Sphere(POINT(121.590347, 31.388094),location) AS distant FROM map;