語法
db2gse.ST_Dimension(g1 db2gse.ST_Geometry)
回覆類型
Integer
範例
使用直欄 GEOTYPE 和 G1 建立 DIMENSION_TEST 表格。 GEOTYPE 直欄儲存的幾何次類別名稱原本是儲存在 G1 幾何直欄。
CREATE TABLE DIMENSION_TEST (geotype varchar(20), g1 db2gse.ST_Geometry)
INSERT 陳述式將範例次類別插入 DIMENSION_TEST 表格。
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)))
下列 SELECT 陳述式列示儲存在 GEOTYPE 直欄 (具有該 geotype 的維度) 的次類別名稱。
SELECT geotype, db2gse.ST_Dimension(g1) "The dimension" FROM DIMENSION_TEST
傳回下列結果集。
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.