# ST_GeomCollFromWKB

## 定义

ST_GeomCollFromWKB 通过熟知二进制表示来构造一个几何集合。

## 语法

`sde.st_geomcollfromwkb (wkb bytea, srid integer)`

## 返回类型

ST_GeomCollection

## 示例

``````CREATE TABLE gcoll_test (pkey integer, shape sde.st_geomcollection );
``````

``````INSERT INTO gcoll_test VALUES
(1,
st_geomcollfromwkb (sde.st_asbinary(sde.st_geomcollection
('multipoint(20 20, 30 30, 20 40, 30 50)', 0)), 0));

INSERT INTO into gcoll_test VALUES
(2,
sde.st_geomcollfromwkb (sde.st_asbinary(sde.st_geomcollection
('multilinestring ((10.02 20.01, 10.32 23.98, 11.92 25.64),
(9.55 23.75,15.36 30.11),(10 10,20 20,30 30,40 40, 90 90))', 0)), 0));

INSERT INTO gcoll_test VALUES
(3,
sde.st_geomcollfromwkb (sde.st_asbinary(sde.st_geomcollection
('multipolygon(((0 0,4 0,4 4,0 4,0 0),(1 1,2 1,2 2,1 2,1 1)),
((-1 -1,-1 -2,-2 -2,-2 -1,-1 -1)))', 0)), 0));
``````

``````SELECT pkey, sde.st_astext(shape) from gcoll_test;

pkey   st_astext

1 	 MULTIPOINT ( 20 20, 30 30, 20 40, 30 50)

3  	 MULTIPOLYGON ((( 0 0, 4 0, 4 4, 0 4, 0 0), (1 1, 1 2,
2 2, 2 1, 1 1)), ((-1 -1, -2 -1, -2 -2, -1 -2, -1 -1))
``````
9/15/2013