ST_IsMeasured

Definición

ST_IsMeasured toma un objeto de geometría como parámetro de entrada y devuelve 1 (Oracle y SQLite) o t (PostgreSQL) si la geometría dada tiene medidas; de lo contrario, se devuelve 0 (Oracle y SQLite) o f (PostgreSQL).

Sintaxis

Oracle y PostgreSQL

sde.st_ismeasured (geometry1 sde.st_geometry)

SQLite

st_ismeasured (geometry1 geometryblob)

Tipo de devolución

Booleano

Ejemplo

Cree una tabla, ism_test, inserte valores en ella y determine qué filas de la tabla ism_test contienen medidas.

Oracle

CREATE TABLE ism_test (
 id integer,
 geom sde.st_geometry
);

INSERT INTO ISM_TEST VALUES (
 19,
 sde.st_geometry ('polygon ((40 120, 90 120, 90 150, 40 150, 40 120))', 4326)
);

INSERT INTO ISM_TEST VALUES (
 20,
 sde.st_geometry ('multipoint m(10 10 5, 50 10 6, 10 30 8)' , 4326)
);

INSERT INTO ISM_TEST VALUES (
 21,
 sde.st_geometry ('linestring z(10 10 166, 20 10 168)', 4326)
);

INSERT INTO ISM_TEST VALUES (
 22, 
 sde.st_geometry ('point zm(10 10 16 30)', 4326)
);

SELECT id, sde.st_ismeasured (geom) M_values
 FROM ISM_TEST;

      ID    M_values

      19          0
      20          1
      21          0
      22          1

PostgreSQL

CREATE TABLE ism_test (
 id integer,
 geom sde.st_geometry
);

INSERT INTO ISM_TEST VALUES (
 19,
 sde.st_geometry ('polygon ((40 120, 90 120, 90 150, 40 150, 40 120))', 4326)
);

INSERT INTO ISM_TEST VALUES (
 20,
 sde.st_geometry ('multipoint m(10 10 5, 50 10 6, 10 30 8)' , 4326)
);

INSERT INTO ISM_TEST VALUES (
 21,
 sde.st_geometry ('linestring z(10 10 166, 20 10 168)', 4326)
);

INSERT INTO ISM_TEST VALUES (
 22, 
 sde.st_geometry ('point zm(10 10 16 30)', 4326)
);

SELECT id, sde.st_ismeasured (geom) 
  AS has_measures
  FROM ism_test;

      id   has_measures

      19          f
      20          t
      21          f
      22          t

SQLite

CREATE TABLE ism_test (
 id integer
);

SELECT AddGeometryColumn (
 NULL,
 'ism_test',
 'geom',
 4326,
 'geometryzm',
 'xyzm',
 'null'
);

INSERT INTO ISM_TEST VALUES (
 19,
 st_geometry ('polygon ((40 120, 90 120, 90 150, 40 150, 40 120))', 4326)
);

INSERT INTO ISM_TEST VALUES (
 20,
 st_geometry ('multipoint m(10 10 5, 50 10 6, 10 30 8)' , 4326)
);

INSERT INTO ISM_TEST VALUES (
 21,
 st_geometry ('linestring z(10 10 166, 20 10 168)', 4326)
);

INSERT INTO ISM_TEST VALUES (
 22, 
 st_geometry ('point zm(10 10 16 30)', 4326)
);

SELECT id, st_ismeasured (geom)
 AS "M_values"
 FROM ism_test;

        ID    M_values

      19          0
      20          1
      21          0
      22          1