ST_Entity
注:
仅适用于 Oracle 中的 ST_Geometry
定义
ST_Entity 返回 ST_Geometry 的空间实体类型。空间实体类型是存储在 ST_Geometry 对象的实体成员字段中的值。
语法
sde.st_entity (g1 sde.st_geometry)
返回类型
数值
示例
CREATE TABLE sample_geometries (id integer, geometry sde.st_geometry); INSERT INTO SAMPLE_GEOMETRIES (id, geometry) VALUES ( 1901, sde.st_geometry ('point (1 2)', 0) ); INSERT INTO SAMPLE_GEOMETRIES (id, geometry VALUES ( 1902, sde.st_geometry ('linestring (33 2, 34 3, 35 6)', 0) ); INSERT INTO SAMPLE_GEOMETRIES (id, geometry) VALUES ( 1903, sde.st_geometry ('polygon ((3 3, 4 6, 5 3, 3 3))', 0) ); SELECT sde.st_entity (geometry) entity, UPPER (sde.st_geometrytype (geometry)) TYPE FROM SAMPLE_GEOMETRIES; ENTITY TYPE 1 ST_POINT 4 ST_LINESTRING 8 ST_POLYGON
7/10/2012