from flask_sqlalchemy import SQLAlchemy db = SQLAlchemy() # 导入所有模型 from app.models.user import User from app.models.student import Student from app.models.attendance import WeeklyAttendance, DailyAttendanceDetail, LeaveRecord __all__ = ['db', 'User', 'Student', 'WeeklyAttendance', 'DailyAttendanceDetail', 'LeaveRecord']