ST_GeometryType

Определение

Функция ST_GeometryType берет объект геометрии и возвращает тип геометрии (точка, линия, полигон, мультиточка) в виде строки.

Синтаксис

Oracle и PostgreSQL

sde.st_geometrytype (g1 sde.st_geometry)

SQLite

st_geometrytype (g1 geometryblob)

Тип возврата

Varchar(32) (Oracle и PostgreSQL) или text (SQLite), содержащий один из следующих вариантов:

• ST_Point
• ST_LineString
• ST_Polygon
• ST_MultiPoint
• ST_MultiLineString
• ST_MultiPolygon

Пример:

В таблице geometrytype_test содержится столбец геометрии g1.

Инструкция INSERT вставляет каждый подкласс геометрии в столбец g1.

Запрос SELECT возвращает тип геометрии каждого подкласса, хранимого в столбце g1.

Oracle

CREATE TABLE geometrytype_test (g1 sde.st_geometry);

INSERT INTO geometrytype_test VALUES (
 sde.st_geometry ('point (10.02 20.01)', 4326)
);

INSERT INTO geometrytype_test VALUES (
 sde.st_geometry ('linestring (10.01 20.01, 10.01 30.01, 10.01 40.01)', 4326)
);

INSERT INTO geometrytype_test VALUES (
 sde.st_geometry ('polygon ((10.02 20.01, 11.92 35.64, 25.02 34.15,
19.15 33.94, 10.02 20.01))', 4326)
);

INSERT INTO geometrytype_test VALUES (
 sde.st_geometry ('multipoint (10.02 20.01, 10.32 23.98, 11.92 25.64)', 4326)
);

INSERT INTO geometrytype_test VALUES (
 sde.st_geometry ('multilinestring ((10.02 20.01, 10.32 23.98,
11.92 25.64), (9.55 23.75, 15.36 30.11))', 4326)
);

INSERT INTO geometrytype_test VALUES (
 sde.st_geometry ('multipolygon (((10.02 20.01, 11.92 35.64, 25.02 34.15,
19.15 33.94, 10.02 20.01)), ((51.71 21.73, 73.36 27.04, 71.52 32.87, 
52.43 31.90,51.71 21.73)))', 4326)
);

SELECT UPPER (sde.st_geometrytype (g1)) Geometry_type
FROM GEOMETRYTYPE_TEST;

Geometry_type

ST_POINT
ST_LINESTRING
ST_POLYGON
ST_MULTIPOINT
ST_MULTILINESTRING
ST_MULTIPOLYGON

PostgreSQL

CREATE TABLE geometrytype_test (g1 sde.st_geometry);

INSERT INTO geometrytype_test VALUES (
 sde.st_geometry ('point (10.02 20.01)', 4326)
);

INSERT INTO geometrytype_test VALUES (
 sde.st_geometry ('linestring (10.01 20.01, 10.01 30.01, 10.01 40.01)', 4326)
);

INSERT INTO geometrytype_test VALUES (
 sde.st_geometry ('polygon ((10.02 20.01, 11.92 35.64, 25.02 34.15,
19.15 33.94, 10.02 20.01))', 4326)
);

INSERT INTO geometrytype_test VALUES (
 sde.st_geometry ('multipoint (10.02 20.01, 10.32 23.98, 11.92 25.64)', 4326)
);

INSERT INTO geometrytype_test VALUES (
 sde.st_geometry ('multilinestring ((10.02 20.01, 10.32 23.98,
11.92 25.64), (9.55 23.75, 15.36 30.11))', 4326)
);

INSERT INTO geometrytype_test VALUES (
 sde.st_geometry ('multipolygon (((10.02 20.01, 11.92 35.64, 25.02 34.15,
19.15 33.94, 10.02 20.01)), ((51.71 21.73, 73.36 27.04, 71.52 32.87, 
52.43 31.90,51.71 21.73)))', 4326)
);

SELECT (sde.st_geometrytype (g1))
 AS Geometry_type
 FROM geometrytype_test;

Geometry_type

ST_POINT
ST_LINESTRING
ST_POLYGON
ST_MULTIPOINT
ST_MULTILINESTRING
ST_MULTIPOLYGON

SQLite

CREATE TABLE geometrytype_test (id integer primary key autoincrement not null);

SELECT AddGeometryColumn (
 NULL,
 'geometrytype_test',
 'g1',
 4326,
 'geometry',
 'xy',
 'null'
);

INSERT INTO geometrytype_test (g1) VALUES (
 st_geometry ('point (10.02 20.01)', 4326)
);

INSERT INTO geometrytype_test (g1) VALUES (
 st_geometry ('linestring (10.01 20.01, 10.01 30.01, 10.01 40.01)', 4326)
);

INSERT INTO geometrytype_test (g1) VALUES (
 st_geometry ('polygon ((10.02 20.01, 11.92 35.64, 25.02 34.15,
19.15 33.94, 10.02 20.01))', 4326)
);

INSERT INTO geometrytype_test (g1) VALUES (
 st_geometry ('multipoint (10.02 20.01, 10.32 23.98, 11.92 25.64)', 4326)
);

INSERT INTO geometrytype_test (g1) VALUES (
 st_geometry ('multilinestring ((10.02 20.01, 10.32 23.98,
11.92 25.64), (9.55 23.75, 15.36 30.11))', 4326)
);

INSERT INTO geometrytype_test (g1) VALUES (
 st_geometry ('multipolygon (((10.02 20.01, 11.92 35.64, 25.02 34.15,
19.15 33.94, 10.02 20.01)), ((51.71 21.73, 73.36 27.04, 71.52 32.87, 
52.43 31.90,51.71 21.73)))', 4326)
);

SELECT (st_geometrytype (g1)) 
 AS "Geometry_type"
 FROM geometrytype_test;

Geometry_type

ST_POINT
ST_LINESTRING
ST_POLYGON
ST_MULTIPOINT
ST_MULTILINESTRING
ST_MULTIPOLYGON