ST_CoordDim

定義

ST_CoordDim は、ジオメトリ列の座標値のディメンション (次元数) を返します。

構文

Oracle および PostgreSQL

sde.st_coorddim (geometry1 sde.st_geometry)

SQLite

st_coorddim (geometry1 geometryblob)

戻り値のタイプ

Integer

2 = XY 座標

3 = XYZ または XYM 座標

4 = XYZM 座標

例

この例では、geotype および g1 列を持つ coorddim_test テーブルを作成します。geotype 列は、g1 ジオメトリ列に格納されるジオメトリ サブクラスおよびディメンションの名前を格納します。

SELECT ステートメントは、geotype 列に格納されているサブクラス名と、そのジオメトリの座標のディメンションをリストします。

Oracle

--Create test table.
CREATE TABLE coorddim_test (
 geotype varchar(20),
 g1 sde.st_geometry
);

--Insert values to the test table.
INSERT INTO COORDDIM_TEST VALUES (
 'Point',
 sde.st_geometry ('point (60.567222 -140.404)', 4326)
);

INSERT INTO COORDDIM_TEST VALUES (
 'Point Z',
 sde.st_geometry ('point Z (60.567222 -140.404 5959)', 4326)
);

INSERT INTO COORDDIM_TEST VALUES (
 'Point M',
 sde.st_geometry ('point M (60.567222 -140.404 5250)', 4326)
);

INSERT INTO COORDDIM_TEST VALUES (
 'Point ZM',
 sde.st_geometry ('point ZM (60.567222 -140.404 5959 5250)', 4326)
);

--Determine the dimensionality of each feature.
SELECT geotype, sde.st_coorddim (g1) coordinate_dimension
 FROM COORDDIM_TEST;

GEOTYPE               coordinate_dimension

Point                           2
Point Z                         3
Point M                         3
Point ZM                        4

PostgreSQL

--Create test table.
CREATE TABLE coorddim_test (
 geotype varchar(20),
 g1 sde.st_geometry
);

--Insert values to the test table.
INSERT INTO coorddim_test VALUES (
 'Point',
 st_point ('point (60.567222 -140.404)', 4326)
);

INSERT INTO coorddim_test VALUES (
 'Point Z',
 st_point ('point z (60.567222 -140.404 5959)', 4326)
);

INSERT INTO coorddim_test VALUES (
 'Point M',
 st_point ('point m (60.567222 -140.404 5250)', 4326)
);

INSERT INTO coorddim_test VALUES (
 'Point ZM',
 st_point ('point zm (60.567222 -140.404 5959 5250)', 4326)
);

--Determine the dimensionality of each feature.
SELECT geotype, st_coorddim (g1) 
 AS coordinate_dimension
 FROM coorddim_test;

geotype              coordinate_dimension

Point                          2
Point Z                        3
Point M                        3
Point ZM                       4

SQLite

--Create test tables and add geometry columns.
CREATE TABLE coorddim_test (
 geotype varchar(20)
);

SELECT AddGeometryColumn(
 NULL,
 'coorddim_test',
 'g1',
 4326,
 'pointzm',
 'xyzm',
 'null'
);

CREATE TABLE coorddim_test2 (
 geotype varchar(20)
);

SELECT AddGeometryColumn(
 NULL,
 'coorddim_test2',
 'g1',
 4326,
 'pointz',
 'xyz',
 'null'
);

CREATE TABLE coorddim_test3 (
 geotype varchar(20)
);

SELECT AddGeometryColumn(
 NULL,
 'coorddim_test3',
 'g1',
 4326,
 'pointm',
 'xym',
 'null'
);

CREATE TABLE coorddim_test4 (
 geotype varchar(20)
);

SELECT AddGeometryColumn(
 NULL,
 'coorddim_test4',
 'g1',
 4326,
 'point',
 'xy',
 'null'
);

--Insert values to the test table.
INSERT INTO coorddim_test4 VALUES (
 'Point',
 st_point ('point (60.567222 -140.404)', 4326)
);

INSERT INTO coorddim_test2 VALUES (
 'Point Z',
 st_point ('point z (60.567222 -140.404 5959)', 4326)
);

INSERT INTO coorddim_test3 VALUES (
 'Point M',
 st_point ('point m (60.567222 -140.404 5250)', 4326)
);

INSERT INTO coorddim_test VALUES (
 'Point ZM',
 st_point ('point zm (60.567222 -140.404 5959 5250)', 4326)
);

--Determine the dimensionality of features in each table.
SELECT geotype, st_coorddim (g1) 
 AS coordinate_dimension
 FROM coorddim_test;

geotype              coordinate_dimension

Point ZM                       4


SELECT geotype, st_coorddim (g1) 
 AS coordinate_dimension
 FROM coorddim_test2;

geotype              coordinate_dimension

Point Z                        3


SELECT geotype, st_coorddim (g1) 
 AS coordinate_dimension
 FROM coorddim_test3;

geotype              coordinate_dimension

Point M                        3


SELECT geotype, st_coorddim (g1) 
 AS coordinate_dimension
 FROM coorddim_test4;

geotype              coordinate_dimension

Point                          2