ST_Dimension
Definition
ST_Dimension gibt die Dimension eines ST_Geometry-Objekts zurück.
Syntax
sde.st_dimension (g1 sde.st_geometry)
Rückgabetyp
Ganzzahl
Beispiel
Die Tabelle "dimension_test" wird mit den Spalten "geotype" und "g1" erstellt. In der Spalte "geotype" wird der Name der Subclass gespeichert, die in der Geometriespalte "g1" gespeichert ist.
Oracle
CREATE TABLE dimension_test (geotype varchar(20), g1 sde.st_geometry); INSERT INTO DIMENSION_TEST VALUES ( 'Point', sde.st_pointfromtext ('point (10.02 20.01)', 0) ); INSERT INTO DIMENSION_TEST VALUES ( 'Linestring', sde.st_linefromtext ('linestring (10.02 20.01, 10.32 23.98, 11.92 25.64)', 0) ); INSERT INTO DIMENSION_TEST VALUES ( 'Polygon', sde.st_polyfromtext ('polygon ((10.02 20.01, 11.92 35.64, 25.02 34.15, 19.15 33.94, 10.02 20.01))', 0) ); INSERT INTO DIMENSION_TEST VALUES ( 'Multipoint', sde.st_mpointfromtext ('multipoint (10.02 20.01, 10.32 23.98, 11.92 25.64)', 0) ); INSERT INTO DIMENSION_TEST VALUES ( 'Multilinestring', sde.st_mlinefromtext ('multilinestring ((10.02 20.01, 10.32 23.98, 11.92 25.64), (9.55 23.75, 15.36 30.11))', 0) ); INSERT INTO DIMENSION_TEST VALUES ( 'Multipolygon', sde.st_mpolyfromtext ('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)))', 0) );
PostgreSQL
CREATE TABLE dimension_test (geotype varchar(20), g1 sde.st_geometry); INSERT INTO dimension_test VALUES ( 'Point', sde.st_point ('point (10.02 20.01)', 0) ); INSERT INTO dimension_test VALUES ( 'Linestring', sde.st_linestring ('linestring (10.02 20.01, 10.32 23.98, 11.92 25.64)', 0) ); INSERT INTO dimension_test VALUES ( 'Polygon', sde.st_polygon ('polygon ((10.02 20.01, 11.92 35.64, 25.02 34.15, 19.15 33.94, 10.02 20.01))', 0) ); INSERT INTO dimension_test VALUES ( 'Multipoint', sde.st_multipoint ('multipoint (10.02 20.01, 10.32 23.98, 11.92 25.64)', 0) ); INSERT INTO dimension_test VALUES ( 'Multilinestring', sde.st_multilinestring ('multilinestring ((10.02 20.01, 10.32 23.98, 11.92 25.64), (9.55 23.75, 15.36 30.11))', 0) ); INSERT INTO dimension_test VALUES ( 'Multipolygon', sde.st_multipolygon ('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)))', 0) );
Mit der SELECT-Anweisung wird der Subclass-Name, der in der Spalte "geotype" gespeichert ist, und die Dimension dieses Geometrietyps aufgelistet.
Oracle
SELECT geotype, sde.st_dimension (g1) Dimension FROM DIMENSION_TEST; GEOTYPE Dimension Point 0 Linestring 1 Polygon 2 Multipoint 0 Multilinestring 1 Multipolygon 2
PostgreSQL
SELECT geotype, sde.st_dimension (g1) AS Dimension FROM dimension_test; geotype dimension Point 0 Linestring 1 Polygon 2 Multipoint 0 Multilinestring 1 Multipolygon 2
7/10/2012