Définition
ST_EndPoint retourne le dernier point d'un objet linestring.
Syntaxe
Oracle et PostgreSQL
sde.st_endpoint (line1 sde.st_geometry)
SQLite
st_endpoint (line1 geometryblob)
Type de retour
ST_Point
Exemple
La table endpoint_test stocke la colonne gid integer, qui identifie chaque enregistrement de façon unique, et la colonne ln1 ST_LineString, qui stocke les objets linestring.
Les instructions INSERT suivantes insèrent des chaînes de lignes dans la table endpoint_test. Contrairement à la deuxième, la première chaîne de lignes n'a ni coordonnées z ni mesures.
Cette requête liste la colonne gid et la géométrie ST_Point générées par la fonction ST_EndPoint.
Oracle
--Create table and insert values.
CREATE TABLE endpoint_test (
gid integer,
ln1 sde.st_geometry
);
INSERT INTO ENDPOINT_TEST VALUES (
1,
sde.st_linefromtext ('linestring (10.02 20.01, 23.73 21.92, 30.10 40.23)', 4326)
);
INSERT INTO ENDPOINT_TEST VALUES (
2,
sde.st_linefromtext ('linestring zm(10.02 20.01 5.0 7.0, 23.73 21.92 6.5 7.1,30.10 40.23 6.9 7.2)', 4326)
);
--Find the end point of each line.
SELECT gid, sde.st_astext (sde.st_endpoint (ln1)) Endpoint
FROM ENDPOINT_TEST;
GID Endpoint
1 POINT (30.10 40.23)
2 POINT ZM (30.10 40.23 6.9 7.2)
PostgreSQL
--Create table and insert values.
CREATE TABLE endpoint_test (
gid integer,
ln1 sde.st_geometry
);
INSERT INTO endpoint_test VALUES (
1,
st_linestring ('linestring (10.02 20.01, 23.73 21.92, 30.10 40.23)', 4326)
);
INSERT INTO endpoint_test VALUES (
2,
st_linestring ('linestring zm(10.02 20.01 5.0 7.0, 23.73 21.92 6.5 7.1,30.10 40.23 6.9 7.2)', 4326)
);
--Find the end point of each line.
SELECT gid, st_astext (st_endpoint (ln1))
AS endpoint
FROM endpoint_test;
gid endpoint
1 POINT (30.10 40.23)
2 POINT ZM (30.10 40.23 6.9 7.2)
SQLite
--Create table, add geometry column, and insert values.
CREATE TABLE endpoint_test (
gid integer primary key autoincrement not null
);
SELECT AddGeometryColumn (
NULL,
'endpoint_test',
'ln1',
4326,
'linestringzm',
'xyzm',
'null'
);
INSERT INTO endpoint_test (ln1) VALUES (
st_linestring ('linestring (10.02 20.01, 23.73 21.92, 30.10 40.23)', 4326)
);
INSERT INTO endpoint_test (ln1) VALUES (
st_linestring ('linestring zm(10.02 20.01 5.0 7.0, 23.73 21.92 6.5 7.1,30.10 40.23 6.9 7.2)', 4326)
);
--Find the end point of each line.
SELECT gid, st_astext (st_endpoint (ln1))
AS "endpoint"
FROM endpoint_test;
gid endpoint
1 POINT (30.10000000 40.23000000)
2 POINT ZM (30.10000000 40.23000000 6.90000000 7.20000000)