Geometry MySQL 5.6查找距离内的点并按距离排序ASC
我有下表:Geometry MySQL 5.6查找距离内的点并按距离排序ASC,geometry,geospatial,mysql-5.6,Geometry,Geospatial,Mysql 5.6,我有下表: CREATE TABLE `places` ( `id` int(11) unsigned NOT NULL AUTO_INCREMENT, `name` varchar(256) DEFAULT NULL, `coordinates` point DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; INSERT INTO `places` ( `name`, `coordinate
CREATE TABLE `places` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`name` varchar(256) DEFAULT NULL,
`coordinates` point DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `places` ( `name`, `coordinates`)
VALUES ("Louvre ", POINT(48.861105, 2.335337));
INSERT INTO `places` ( `name`, `coordinates`)
VALUES ("Eiffel Tower", POINT(48.858271, 2.293795));
INSERT INTO `places` ( `name`, `coordinates`)
VALUES ("Pere Lachaise", POINT(48.861131, 2.394683));
INSERT INTO `places` ( `name`, `coordinates`)
VALUES ("Brooklyn", POINT(40.711089, -73.948391));
我想返回卢浮宫5英里范围内的所有地方,其中应返回3张记录(卢浮宫、埃菲尔铁塔、佩雷·拉查斯)
我运行了以下查询,但最终得到了所有4条记录。我做错了什么
SET @radius = 5 * 1609.344; -- convert miles to meters
SELECT name, ST_Distance(coordinates,POINT(48.861105, 2.335337)) AS distance
FROM places
WHERE ST_Within(coordinates, ST_Buffer(POINT(48.861105, 2.335337),@radius))
ORDER BY distance ASC
注意:我知道MySQL5.7有ST_Distance_Sphere()函数来实现上述功能,但目前我仍坚持使用5.6
感谢您的帮助。您可以使用哈弗公式对ST_Distance_球体进行多边形填充:
DELIMITER $$
CREATE FUNCTION `ST_Distance_Sphere` (point1 POINT, point2 POINT)
RETURNS FLOAT
no sql deterministic
BEGIN
declare R INTEGER DEFAULT 6371000;
declare `φ1` float;
declare `φ2` float;
declare `Δφ` float;
declare `Δλ` float;
declare a float;
declare c float;
set `φ1` = radians(y(point1));
set `φ2` = radians(y(point2));
set `Δφ` = radians(y(point2) - y(point1));
set `Δλ` = radians(x(point2) - x(point1));
set a = sin(`Δφ` / 2) * sin(`Δφ` / 2) + cos(`φ1`) * cos(`φ2`) * sin(`Δλ` / 2) * sin(`Δλ` / 2);
set c = 2 * atan2(sqrt(a), sqrt(1-a));
return R * c;
END$$
DELIMITER ;
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