【Postgres】根据字段数据创建空间字段

 

--添加空间字段
SELECT AddGeometryColumn ('GIS', '四至', 4326, 'POLYGON', 2);

--根据其他字段更新空间字段数据
update "GIS" b 
set "四至"=ST_GeomFromText ('POLYGON((' || to_char(a."东经起",'999.9999') || to_char(a."北纬起",'999.9999') || ',' || to_char(a."东经止",'999.9999') || to_char(a."北纬起",'999.9999') || ',' || to_char(a."东经止",'999.9999') || to_char(a."北纬止",'999.9999') ||',' || to_char(a."东经起",'999.9999') || to_char(a."北纬止",'999.9999') || ',' || to_char(a."东经起",'999.9999') || to_char(a."北纬起",'999.9999') || '))',4326)
from "GIS" a
where b."ID"=a."ID"

--创建索引
CREATE INDEX shape_index_sz1
ON "GIS"
USING gist
(四至); 

--查询与指定范围相交的多边形
SELECT * FROM "GIS" where 
ST_Intersects(
ST_GeomFromText('POLYGON((86 44.1667,87.3333 44.1667,87.3333 45.1667,86 45.1667,86 44.1667))'), ST_GeomFromText(ST_AsText("四至")))