ST_LineFromWKB
定义
ST_LineFromWKB 以 ST_LineString 类型的熟知二进制 (WKB) 表示和空间参考 ID 作为输入,返回 ST_LineString 类型的对象。
语法
Oracle
sde.st_linefromwkb (wkb blob, srid integer)
PostgreSQL
sde.st_linefromwkb (wkb bytea, srid integer)
返回类型
ST_LineString
示例
在以下示例中,对结果行进行了重新格式化,以增强可读性。结果中的间距将根据在线显示而有所不同。下列代码使用 ST_LineFromWKB 函数基于 WKB 表示创建和插入线。该行将被插入到包含 ID 和使用 WKB 表示的空间参考系统 1 中的线的 sample_lines 表中。
Oracle
CREATE TABLE sample_lines (id smallint, geometry sde.st_linestring, wkb blob);
INSERT INTO SAMPLE_LINES (id, geometry) VALUES (
1901,
sde.st_linestring ('linestring (850 250, 850 850)', 0)
);
INSERT INTO SAMPLE_LINES (id, geometry) VALUES (
1902,
sde.st_linestring ('linestring (33 2, 34 3, 35 6)', 0)
);
UPDATE SAMPLE_LINES
SET wkb = sde.st_asbinary (geometry)
WHERE id = 1901;
UPDATE SAMPLE_LINES
SET wkb = sde.st_asbinary (geometry)
WHERE id = 1902;
SELECT id, sde.st_astext (sde.st_linefromwkb (wkb,0)) LINE
FROM SAMPLE_LINES;
ID LINE
1901 LINESTRING (850.00000000 250.00000000, 850.00000000 850.00000000)
1902 LINESTRING (33.00000000 2.00000000, 34.00000000 3.00000000, 35.00000000 6.00000000)
PostgreSQL
CREATE TABLE sample_lines (id integer, geometry sde.st_linestring, wkb bytea);
INSERT INTO sample_lines (id, geometry) VALUES (
1901,
sde.st_linestring ('linestring (850 250, 850 850)', 0)
);
INSERT INTO sample_lines (id, geometry) VALUES (
1902,
sde.st_linestring ('linestring (33 2, 34 3, 35 6)', 0)
);
UPDATE sample_lines
SET wkb = sde.st_asbinary (geometry)
WHERE id = 1901;
UPDATE sample_lines
SET wkb = sde.st_asbinary (geometry)
WHERE id = 1902;
SELECT id, sde.st_astext (st_linefromwkb (wkb,0))
AS LINE
FROM sample_lines;
id line
1901 LINESTRING (850 250, 850 850)
1902 LINESTRING (33 2, 34 3, 35 6)
9/15/2013