我正在尝试将查询转换为 sqlalchemy 和 geoalchemy2 中的相等 orm 语句。我正在努力如何将 p1.geom 的引用获取到 not exists 子句中的子查询中。
SELECT p1.geom FROM polygons as p1
WHERE p1.column1 = 'something' AND NOT EXISTS(
SELECT 1 FROM polygons AS p2
WHERE p2.column2 = 'something else' AND ST_Intersects(p1.geom, p2.geom)
)
我已经尝试了一些,但我得到的最接近的是这样的:
p1 = self._session.query(polygons.geom).filter_by(column1='something').subquery()
p2 = ~self._session.query(polygons.geom).filter(polygons.column2 == 'something else')\
.filter(polygons.geom.intersects(p1.c.geom)).exists()
result = self._session.query(polygons.geom)\
.filter_by(column1='something')\
.filter(p2)
我从中得到了什么:
SELECT polygons.geom FROM polygons
WHERE polygons.column1 = 'something' AND NOT (EXISTS (
SELECT 1 FROM (
SELECT polygons.geom AS geom FROM polygons
WHERE polygons.column1 = 'something') AS anon_1
WHERE polygons.column2 = 'something else' AND (polygons.geom && anon_1.geom)))
有什么可以帮助的想法吗?