ST_Dimension toma um objeto de figura geométrica e retorna sua dimensão.
Sintaxe
db2gse.ST_Dimension(g1 db2gse.ST_Geometry)
Tipo de retorno
Inteiro
Exemplos
A tabela DIMENSION_TEST é criada com as colunas GEOTYPE e G1. A coluna GEOTYIPE armazena o nome da subclasse de figura geométrica armazenada na coluna de figura geométrica G1.
CREATE TABLE DIMENSION_TEST (geotype varchar(20), g1 db2gse.ST_Geometry)
As instruções INSERT inserem uma subclasse de amostra na tabela DIMENSION_TEST.
INSERT INTO DIMENSION_TEST VALUES('Point', db2gse.ST_PointFromText('point (10.02 20.01)', db2gse.coordref()..srid(0))) INSERT INTO DIMENSION_TEST VALUES ('Linestring', db2gse.ST_LineFromText('linestring (10.02 20.01,10.32 23.98, 11.92 25.64)', db2gse.coordref()..srid(0))) INSERT INTO DIMENSION_TEST VALUES('Polygon', db2gse.ST_PolyFromText('polygon ((10.02 20.01,11.92 35.64,25.02 34.15, 19.15 33.94,10.02 20.01))', db2gse.coordref()..srid(0))) INSERT INTO DIMENSION_TEST VALUES('Multipoint', db2gse.ST_MPointFromText('multipoint (10.02 20.01,10.32 23.98, 11.92 25.64)', db2gse.coordref()..srid(0))) INSERT INTO DIMENSION_TEST VALUES('Multilinestring', db2gse.ST_MLineFromText('multilinestring ((10.02 20.01,10.32 23.98, 11.92 25.64),(9.55 23.75,15.36 30.11))', db2gse.coordref()..srid(0))) INSERT INTO DIMENSION_TEST VALUES('Multipolygon', db2gse.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)))', db2gse.coordref)..srid(0)))
A seguinte instrução SELECT relaciona o nome da subclasse armazenado na coluna GEOTYPE à dimensão desse geotipo.
SELECT geotype, db2gse.ST_Dimension(g1) "A dimensão" FROM DIMENSION_TEST
O seguinte conjunto de resultados retorna.
GEOTYPE The dimension -------------------- ------------- ST_Point 0 ST_Linestring 1 ST_Polygon 2 ST_Multipoint 0 ST_Multilinestring 1 ST_Multipolygon 2 6 record(s) selected.