ST_AsText

Definition

ST_AsText wählt ein ST_Geometry-Objekt aus und gibt dessen WKT-Darstellung (Well-Known Text) zurück.

Syntax

sde.st_astext (g1 sde.st_geometry)

Rückgabetyp

Oracle

CLOB

PostgreSQL

Text

Beispiel

Die Funktion ST_AsText wandelt den Standort "hazardous_sites" in dessen Textbeschreibung um.

Oracle

CREATE TABLE hazardous_sites (site_id integer,
                             name varchar(40),
                             location sde.st_geometry);

INSERT INTO HAZARDOUS_SITES VALUES (
102,
'W. H. KleenareChemical Repository',
sde.st_pointfromtext ('point (1020.12 324.02)', 0)
);

SELECT site_id, name, sde.st_astext (location) Location
FROM HAZARDOUS_SITES;

SITE_ID      NAME                             Location

   102    W. H. KleenareChemical Repository   POINT (1020.12000000 324.02000000)

PostgreSQL

CREATE TABLE hazardous_sites (site_id integer,
                             name varchar(40),
                             location sde.st_geometry);

INSERT INTO hazardous_sites VALUES (
102,
'W. H. KleenareChemical Repository',
sde.st_point ('point (1020.12 324.02)', 0)
);

SELECT site_id, name, sde.st_astext (location) 
AS location
FROM hazardous_sites;

site_id      name                             location

   102    W. H. KleenareChemical Repository   POINT (1020.12000001 324.01999999)