擅长:python、mysql、java
<p>假设您正在尝试使用段PKs作为FKs to Resource,请尝试在PK属性定义上定义FKs,例如,沿着以下行:</p>
<pre><code>class Resourcesegment(Base):
__tablename__ = 'resourcesegment'
VersionID = Column(String, ForeignKey(Resource.VersionID), primary_key=True)
ResourceID = Column(String, ForeignKey(Resource.ResourceID), primary_key=True)
Segment_Type = Column(String, primary_key=True)
Segment_Number = Column(Integer, primary_key=True)
Segment_Property = Column(String)
resource = relationship("Resource", back_populates="segments")
</code></pre>