4.PostGIS

SELECT ST_GeometryFromText('POINT(116.39088 39.90763)',4326);

SELECT ST_GeomFromText('POINT(116.39088 39.90763)',4326);

SELECT ST_PointFromText('POINT(116.39088 39.90763)',4326);

 

1、创建点类型的表，类型不要选择postgresql提供的空间数据类型，要选择postgis提供的数据类型。

CREATE TABLE pointtable ( id SERIAL PRIMARY KEY, name VARCHAR(128), geom GEOMETRY(Point) );

 

2、插入点

INSERT INTO pointtable (name, geom) VALUES ('p1', ST_GeomFromText('POINT(120.205707 31.839323)', 4326) );

 

3、查询点

SELECT ST_X(geom) as x,ST_Y(geom) as y from pointtable;

--SRID=4326;POINT(120.205707 31.839323)

SELECT st_asewkt(geom) as point from pointtable;

--POINT(120.205707 31.839323)

SELECT ST_AsText(geom) as point from pointtable;

--{"type":"Point","coordinates":[120.205707,31.839323]}

SELECT ST_AsGeoJSON(geom) as point from pointtable;