ST_PointFromWKB takes a well-known binary (WKB) representation of type ST_Point and a spatial reference ID to return an ST_Point.
Oracle
sde.st_pointfromwkb (wkb blob, srid integer)
PostgreSQL
st_pointfromwkb (wkb bytea, srid integer)
This example illustrates how ST_PointFromWKB can be used to create a point from its well-known binary representation. The geometries are points in spatial reference system 1. In this example, the points are stored in the geometry column of the sample_points table, and then the wkb column is updated with their well-known binary representations (using the ST_AsBinary function). Finally, the ST_PointFromWKB function is used to return the points from the wkb column. The sample_points table has a geometry column, where the points are stored, and a wkb column, where the points' well-known binary representations are stored.
Oracle
CREATE TABLE sample_points (id integer, geometry sde.st_point, wkb blob);
INSERT INTO sample_points (id, geometry) VALUES (
10,
sde.st_point ('point (44 14)', 0)
);
INSERT INTO sample_points (id, geometry) VALUES (
11,
sde.st_point ('point (24 13)', 0)
);
UPDATE sample_points
SET wkb = sde.st_asbinary (geometry)
WHERE id = 10;
UPDATE sample_points
SET wkb = sde.st_asbinary (geometry)
WHERE id = 11;
PostgreSQL
CREATE TABLE sample_points (id integer, geometry st_point, wkb bytea);
INSERT INTO sample_points (id, geometry) VALUES (
10,
st_point ('point (44 14)', 0)
);
INSERT INTO sample_points (id, geometry) VALUES (
11,
st_point ('point (24 13)', 0)
);
UPDATE sample_points
SET wkb = st_asbinary (geometry)
WHERE id = 10;
UPDATE sample_points
SET wkb = st_asbinary (geometry)
WHERE id = 11;
In the following SELECT statement, the ST_PointFromWKB function is used to retrieve the points from the wkb column.
Oracle
SELECT id, sde.st_astext (sde.st_pointfromwkb(wkb, 0)) POINTS
FROM sample_points;
ID POINTS
10 POINT (44.00000000 14.00000000)
11 POINT (24.00000000 13.00000000)
PostgreSQL
SELECT id, st_astext (st_pointfromwkb(wkb, 0)) AS points
FROM sample_points;
id points
10 POINT (44 14)
11 POINT (24 13)