ST_SRID

定义

ST_SRID 以几何对象作为输入参数,并返回其空间参考 ID。

语法

Oracle 和 PostgreSQL

sde.st_srid (geometry1 sde.st_geometry)

SQLite

st_srid (geometry1 geometryblob)

返回类型

整型

示例

创建下列表格:

在下一语句中,位于坐标 (10.01, 50.76) 处的点几何将插入到几何列 g1 中。创建点几何时,给点几何分配 SRID 值 4326。

ST_SRID 函数返回刚输入的几何的空间参考 ID。

Oracle

CREATE TABLE srid_test (g1 sde.st_geometry);
INSERT INTO SRID_TEST VALUES (
 sde.st_geometry ('point (10.01 50.76)', 4326)
);
SELECT sde.st_srid (g1) SRID_G1
 FROM SRID_TEST;

SRID_G1

4326

PostgreSQL

CREATE TABLE srid_test (g1 sde.st_geometry);
INSERT INTO srid_test VALUES (
 sde.st_point ('point (10.01 50.76)', 4326)
);
SELECT sde.st_srid (g1) 
 AS SRID_G1
 FROM srid_test;

srid_g1

4326

SQLite

CREATE TABLE srid_test (id integer);

SELECT AddGeometryColumn(
 NULL,
 'srid_test',
 'g1',
 4326,
 'point',
 'xy',
 'null'
);
INSERT INTO srid_test VALUES (
 1,
 st_point ('point (10.01 50.76)', 4326)
);
SELECT st_srid (g1) 
 AS "SRID"
 FROM srid_test;

SRID

4326

相关主题

5/25/2014