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92 lines
3.0 KiB
92 lines
3.0 KiB
from datetime import date
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from typing import List, Optional
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from dal.StudentDAL import StudentDAL
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from student.Student import Student
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class StudentBLL:
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def __init__(self, dal: StudentDAL):
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self.dal = dal
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def add_student(self, student: Student):
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if not student.is_valid:
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errors = ", ".join(student.get_errors())
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raise ValueError(f"学生数据校验失败: {errors}")
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if not self.dal.add_student(student):
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raise ValueError("添加失败，身份证号或学号可能已存在")
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def delete_student(self, stu_id: str):
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if not self.dal.delete_student(stu_id):
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raise ValueError(f"找不到学号为 {stu_id} 的学生")
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def update_student(self, stu_id: str, student: Student):
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if not student.is_valid:
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errors = ", ".join(student.get_errors())
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raise ValueError(f"学生数据校验失败: {errors}")
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if not self.dal.update_student(stu_id, student):
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raise ValueError(f"找不到学号为 {stu_id} 的学生")
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def get_student_by_id_card(self, id_card: str) -> Optional[Student]:
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return self.dal.get_by_id_card(id_card)
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def get_student_by_stu_id(self, stu_id: str) -> Optional[Student]:
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return self.dal.get_by_stu_id(stu_id)
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def get_all_students(self) -> List[Student]:
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return self.dal.get_all()
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def search_students(self, search_type: str, keyword: str) -> List[Student]:
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search_type = search_type.lower()
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if search_type == 'name':
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return self.dal.search_by_name(keyword)
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elif search_type == 'class':
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return self.dal.search_by_class(keyword)
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elif search_type == 'major':
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return self.dal.search_by_major(keyword)
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else:
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return []
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def get_student_count(self) -> int:
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return self.dal.get_student_count()
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def get_major_counts(self) -> dict:
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return self.dal.get_major_counts()
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def calculate_avg_height(self) -> float:
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students = self.dal.get_all()
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heights = [s.height for s in students if s.height is not None]
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if not heights:
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return 0.0
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return sum(heights) / len(heights)
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def calculate_avg_weight(self) -> float:
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students = self.dal.get_all()
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weights = [s.weight for s in students if s.weight is not None]
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if not weights:
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return 0.0
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return sum(weights) / len(weights)
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def get_students_by_age(self, min_age: int, max_age: int) -> List[Student]:
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today = date.today()
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students = self.dal.get_all()
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result = []
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for student in students:
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if student.age is None:
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continue
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if min_age <= student.age <= max_age:
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result.append(student)
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return result
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def export_data(self, file_path: str) -> bool:
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return self.dal.export_data(file_path)
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def import_data(self, file_path: str) -> bool:
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return self.dal.import_data(file_path)
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def clear_all(self) -> bool:
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return self.dal.clear_all() |