34 lines
1.0 KiB
Python
34 lines
1.0 KiB
Python
"""客户评级数据访问（每客户一行）。
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本层只 flush 不 commit —— 事务边界由 services 层控制。
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"""
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from sqlalchemy import select
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from sqlalchemy.orm import Session
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from app.models import CustomerRating
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# ==================== 读取 ====================
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def get_by_customer_id(session: Session, customer_id: int) -> CustomerRating | None:
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"""查某客户的当前评级（uk_customer_ratings_customer_id 保证至多一行）。"""
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stmt = select(CustomerRating).where(CustomerRating.customer_id == customer_id)
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return session.execute(stmt).scalar_one_or_none()
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# ==================== 写入 ====================
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def create(session: Session, rating: CustomerRating) -> CustomerRating:
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"""新增评级行。只 flush 以取得自增 id。"""
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session.add(rating)
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session.flush()
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return rating
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def delete(session: Session, rating: CustomerRating) -> None:
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"""删除评级行（客户物理删除前的联动清理，调用方先校验业务引用）。"""
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session.delete(rating)
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session.flush()
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