PostGIS 测试 - 基本类型(WKT & WKB)
1.建表
CREATE TABLE postgis2d (
id SERIAL PRIMARY KEY,
name VARCHAR(128),
geom GEOMETRY
);
2.添加GIST索引
CREATE INDEX postgis2d_gix ON postgis2d USING GIST (geom);
3.插入数据
3.1 点(POINT)
INSERT INTO postgis2d (name, geom) VALUES ('p1',
ST_GeomFromText('POINT(0 0)', 26910)
);
INSERT INTO postgis2d (name,geom) VALUES ('p2',
ST_GeomFromText('POINT(5 0)', 26910)
);
INSERT INTO postgis2d (name,geom) VALUES ('p3',
ST_GeomFromText('POINT(0 10)', 26910)
);
或使用多点(MULTIPOINT)
INSERT INTO postgis2d (name,geom) VALUES ('p3',
ST_GeomFromText('MULTIPOINT((0 0),(5 0),(0 10))', 26910)
);
QGIS中显示几何如下:
3.2 线(LINESTRING)
INSERT INTO postgis2d (name, geom) VALUES ('L1',
ST_GeomFromText('LINESTRING(0 0,1 1,1 2)', 26910)
);
INSERT INTO postgis2d (name, geom) VALUES ('L2',
ST_GeomFromText('LINESTRING(1 0,2 1,2 2)', 26910)
);
或使用多线(MULTILINESTRING)
INSERT INTO postgis2d (name, geom) VALUES ('L1',
ST_GeomFromText('MULTILINESTRING((0 0,1 1,1 2),(1 0,2 1,2 2))', 26910)
);
QGIS中显示几何如下:
3.3 多边形(POLYGON)
INSERT INTO postgis2d (name, geom) VALUES ('p1',
ST_GeomFromText('POLYGON((4 0,8 0,8 4,4 0))', 26910)
);
INSERT INTO postgis2d (name, geom) VALUES ('p2',
ST_GeomFromText('POLYGON((1 1, 2 1, 2 2, 1 2,1 1))', 26910)
);
或使用多边形集合(MULTIPOLYGON)
INSERT INTO postgis2d (name, geom) VALUES ('p2',
ST_GeomFromText('MULTIPOLYGON(((4 0,8 0,8 4,4 0),(1 1, 2 1, 2 2, 1 2,1 1)))', 26910)
);
QGIS中显示几何如下:
3.4 几何集合
INSERT INTO postgis2d (name, geom) VALUES ('c1',
ST_GeomFromText('GEOMETRYCOLLECTION(POLYGON((4 0,8 0,8 4,4 0)),LINESTRING(2 3,3 4))',26910)
);