ST_AddPoint
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Name

ST_AddPoint — 라인스트링에 포인트를 추가합니다.

Synopsis

geometry ST_AddPoint(geometry linestring, geometry point);

geometry ST_AddPoint(geometry linestring, geometry point, integer position = -1);

설명

Adds a point to a LineString before the index position (using a 0-based index). If the position parameter is omitted or is -1 the point is appended to the end of the LineString.

1.1.0 버전부터 사용할 수 있습니다.

This function supports 3d and will not drop the z-index.

예시

Add a point to the end of a 3D line

SELECT ST_AsEWKT(ST_AddPoint('LINESTRING(0 0 1, 1 1 1)', ST_MakePoint(1, 2, 3)));

    st_asewkt
    ----------
    LINESTRING(0 0 1,1 1 1,1 2 3)

Guarantee all lines in a table are closed by adding the start point of each line to the end of the line only for those that are not closed. 

UPDATE sometable
SET geom = ST_AddPoint(geom, ST_StartPoint(geom))
FROM sometable
WHERE ST_IsClosed(geom) = false;