Definition
ST_MLineFromWKB takes a well-known binary (WKB) representation of type ST_MultiLineString and a spatial reference ID and creates an ST_MultiLineString.
Syntax
Oracle
sde.st_mlinefromwkb (wkb blob, srid integer)
sde.st_mlinefromwkb (wkb blob)
If you do not specify an SRID, the spatial reference defaults to 4326.
PostgreSQL
sde.st_mlinefromwkb (wkb bytea, srid integer)
SQLite
st_mlinefromwkb (wkb blob, srid int32)
st_mlinefromwkb (wkb blob)
If you do not specify an SRID, the spatial reference defaults to 4326.
Return type
ST_MultiLineString
Example
This example illustrates how ST_MLineFromWKB can be used to create a multilinestring from its well-known binary representation. The geometry is a multilinestring in spatial reference system 4326. In this example, the multilinestring is stored with ID = 10 in the geometry column of the sample_mlines table, and the wkb column is updated with its well-known binary representation (using the ST_AsBinary function). Finally, the ST_MLineFromWKB function is used to return the multilinestring from the wkb column. The sample_mlines table has a geometry column, where the multilinestring is stored, and a wkb column, where the multilinestring's WKB representation is stored.
The SELECT statement includes the ST_MLineFromWKB function, which is used to retrieve the multilinestring from the wkb column.
Oracle
CREATE TABLE sample_mlines (
id integer,
geometry sde.st_geometry,
wkb blob
);
INSERT INTO SAMPLE_MLINES (id, geometry) VALUES (
10,
sde.st_multilinestring ('multilinestring ((61 2, 64 3, 65 6), (58 4, 59 5, 61 8), (69 3, 67 4, 66 7, 68 9))', 4326)
);
UPDATE SAMPLE_MLINES
SET wkb = sde.st_asbinary (geometry)
WHERE id = 10;
SELECT id, sde.st_astext (sde.st_mlinefromwkb (wkb,0)) MULTI_LINE_STRING
FROM SAMPLE_MLINES
WHERE id = 10;
ID MULTI_LINE_STRING
10 MULTILINESTRING ((61.00000000 2.00000000, 64.00000000 3.00000000, 65.00000000 6.00000000), (58.00000000 4.00000000, 59.00000000 5.00000000, 61.00000000 8.0000000), (69.00000000 3.00000000, 67.00000000 4.00000000, 66.00000000 7.00000000, 68.00000000 9.00000000 ))
PostgreSQL
CREATE TABLE sample_mlines (
id integer,
geometry sde.st_geometry,
wkb bytea);
INSERT INTO sample_mlines (id, geometry) VALUES (
10,
sde.st_multilinestring ('multilinestring ((61 2, 64 3, 65 6), (58 4, 59 5, 61 8), (69 3, 67 4, 66 7, 68 9))', 4326)
);
UPDATE sample_mlines
SET wkb = sde.st_asbinary (geometry)
WHERE id = 10;
SELECT id, sde.st_astext (sde.st_mlinefromwkb (wkb,4326))
AS MULTI_LINE_STRING
FROM sample_mlines
WHERE id = 10;
id multi_line_string
10 MULTI_LINE_STRING ((61 2, 64 3, 65 6), (58 4, 59 5,61 8), (69 3, 67 4, 66 7, 68 9 ))
SQLite
CREATE TABLE sample_mlines (
id integer,
wkb blob);
SELECT AddGeometryColumn (
NULL,
'sample_mlines',
'geometry',
4326,
'multilinestring',
'xy',
'null'
);
INSERT INTO sample_mlines (id, geometry) VALUES (
10,
st_multilinestring ('multilinestring ((61 2, 64 3, 65 6), (58 4, 59 5, 61 8), (69 3, 67 4, 66 7, 68 9))', 4326)
);
UPDATE sample_mlines
SET wkb = st_asbinary (geometry)
WHERE id = 10;
SELECT id, st_astext (st_mlinefromwkb (wkb,4326))
AS MULTI_LINE_STRING
FROM sample_mlines
WHERE id = 10;
id multi_line_string
10 MULTI_LINE_STRING ((61.00000000 2.00000000, 64.00000000 3.00000000, 65.00000000 6.00000000),
(58.00000000 4.00000000, 59.00000000 5.00000000, 61.00000000 8.00000000),
(69.00000000 3.00000000, 67.00000000 4.00000000, 66.00000000 7.00000000, 68.00000000 9.00000000 ))