postgresql – Python SQLAlchemy：映射PostGIS geom字段

sqlAlchemy将DB列映射到 Python中的对象成员. For example：

class User(Base):
    __tablename__ = 'users'
    id = Column(Integer,Sequence('user_id_seq'),primary_key=True)
    name = Column(String(50))
    fullname = Column(String(50))
    password = Column(String(12))

应该使用哪种类型将PostGIS geom column映射到班级成员？

解决方法

据我所知,sqlAlchemy没有内置方法可以做到这一点.但是,GeoAlchemy2是sqlAlchemy的扩展,它增加了对地理空间字段(点,线,多边形等)的支持：

from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column,Integer,String,Sequence
from geoalchemy2 import Geometry

Base = declarative_base()

class User(Base):
    __tablename__ = 'users'
    id = Column(Integer,primary_key=True)
    name = Column(String(50))
    fullname = Column(String(50))
    password = Column(String(12))
    geom = Column(Geometry('POINT'))

GeoAlchemy2还提供空间查询功能.从docs开始：

query = session.query(Lake).filter(Lake.geom.ST_Contains('POINT(4 1)'))