使用 maria db 进行地理空间

Question

我需要使用 maria db 从特定纬度/经度选择 30 公里半径内的所有点作为圆。

例如：

latitude = 46.8167
longitude = 6.9333

Answer 1

现在你可以使用 MariaDB 做这样的事情：

CREATE OR REPLACE TABLE locations (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(100),
    coordinates POINT NOT NULL,
    SPATIAL INDEX(coordinates)
);

INSERT INTO locations (name, coordinates) VALUES
('Location1', POINT(6.9333, 46.8267)),
('Location2', POINT(6.9433, 46.8167)),
('Location3', POINT(6.9633, 46.7967)),
('Location4', POINT(6.9833, 46.7767)),
('Location5', POINT(7.0233, 46.7367)),
('Location7', POINT(7.2333, 46.6167)),
('Location6', POINT(7.1333, 46.7167)),
('Location8', POINT(7.3333, 46.5167)),
('Location9', POINT(7.4333, 46.4167)),
('Location10', POINT(7.5333, 46.3167));

SELECT id, name,
    ST_Distance_Sphere(
        coordinates,
        POINT(6.9333, 46.8167)
    ) / 1000 AS distance_km
FROM locations
WHERE ST_Distance_Sphere(
    coordinates,
    POINT(6.9333, 46.8167)
) <= 30000;