线串集合

零个或多个线串的集合。线串集合没有维度。线串集合的边界是包含所有线串起点和终点的点集合对象。

以下是线串集合的示例：

示例

下面的示例使用 GEOMETRY 类型创建表，使用复制将线串集合加载到表，然后查询表来查看线串集合：

=> CREATE TABLE multilinestring_geom (gid int, geom GEOMETRY(1000));
CREATE TABLE
=> COPY multilinestring_geom(gid, gx filler LONG VARCHAR, geom AS ST_GeomFromText(gx)) FROM stdin delimiter '|';
Enter data to be copied followed by a newline.
End with a backslash and a period on a line by itself.
>>1|MULTILINESTRING((1 5, 2 4, 5 3, 6 6),(3 5, 3 7))
>>\.
=> SELECT gid, ST_AsText(geom) FROM multilinestring_geom;
 gid |                     ST_AsText
-----+----------------------------------------------------
   1 | MULTILINESTRING ((1 5, 2 4, 5 3, 6 6), (3 5, 3 7))
(1 row)

下面的示例使用 GEOGRAPHY 类型创建表，使用 COPY 将线串集合加载到表，然后查询表以查看线串集合：

=> CREATE TABLE multilinestring_geog (gid int, geog GEOGRAPHY(1000));
CREATE TABLE
=> COPY multilinestring_geog(gid, gx filler LONG VARCHAR, geog AS ST_GeographyFromText(gx)) FROM stdin delimiter '|';
Enter data to be copied followed by a newline.
End with a backslash and a period on a line by itself.
>>1|MULTILINESTRING((42.1 71, 41.4 70, 41.3 72.9), (42.99 71.46, 44.47 73.21))
>>\.
=> SELECT gid, ST_AsText(geog) FROM multilinestring_geog;
 gid |                                  ST_AsText
-----+----------------------------------------------------------------------------
   1 | MULTILINESTRING((42.1 71, 41.4 70, 41.3 72.9), (42.99 71.46, 44.47 73.21))
(1 row)