from sqlalchemy import func
message_count = self.db.query(func.count(Message.uid)).filter(Message.uid == self.uid, Message.msg_readstatus == MessageStatus.un_read.value).scalar()
from sqlalchemy import func
message_count = self.db.query(func.count(Message.uid)).filter(Message.uid == self.uid, Message.msg_readstatus == MessageStatus.un_read.value).scalar()
本文标题：sqlalchemy 获取计数 count
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