时间：2021-07-01 10:21:17 帮助过：18人阅读
需求：
用户角色，讲师＼学员， 用户登陆后根据角色不同，能做的事情不同，分别如下
讲师视图：
学员视图：
表结构：
根据需求先画表结构
程序目录结构：
表结构实例代码：
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from sqlalchemy import String,Column,Integer,ForeignKey,DATE,Table
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relationship
from conf.settings import engine
############创建数据表结构######################3
Base = declarative_base()
# 班级与学生的对应关系表
teacher_m2m_class = Table("teacher_m2m_class",Base.metadata,
Column("teacher_id", Integer, ForeignKey("teacher.teacher_id")),
Column("class_id", Integer, ForeignKey("class.class_id")),
)
# 班级与学生的对应关系表
class_m2m_student = Table("class_m2m_student",Base.metadata,
Column("class_id",Integer,ForeignKey("class.class_id")),
Column("stu_id", Integer, ForeignKey("student.stu_id")),
)
class Class_m2m_Lesson(Base):
‘‘‘班级和课节对应表‘‘‘
__tablename__ = "class_m2m_lesson"
id = Column(Integer, primary_key=True)
class_id = Column(Integer,ForeignKey("class.class_id"))
lesson_id = Column(Integer, ForeignKey("lesson.lesson_id"))
classes = relationship("Class",backref="class_m2m_lessons")
lessons = relationship("Lesson", backref="class_m2m_lessons")
def __repr__(self):
return "%s %s" % (self.classes,self.lessons)
class Study_record(Base):
"上课记录"
__tablename__ = "study_record"
id = Column(Integer,primary_key=True)
class_m2m_lesson_id = Column(Integer,ForeignKey("class_m2m_lesson.id"))
stu_id = Column(Integer, ForeignKey("student.stu_id"))
status = Column(String(32),nullable=False)
score = Column(Integer,nullable=True)
class_m2m_lessons = relationship("Class_m2m_Lesson",backref="my_study_record")
students = relationship("Student", backref="my_study_record")
def __repr__(self):
return "\033[35;0m%s,%s,状态：【%s】,成绩：【%s】\33[0m"%(self.class_m2m_lessons,self.students,self.status,self.score)
class Teacher(Base):
"讲师"
__tablename__ = "teacher"
teacher_id = Column(Integer, primary_key=True)
teacher_name = Column(String(32), nullable=False, unique=True) #唯一
classes = relationship("Class", secondary=teacher_m2m_class, backref="teachers")
def __repr__(self):
return "讲师：【%s】"%self.teacher_name
class Class(Base):
"班级"
__tablename__ ="class"
class_id = Column(Integer, primary_key=True)
class_name = Column(String(32), nullable=False,unique=True)
course = Column(String(32), nullable=False)
students = relationship("Student",secondary=class_m2m_student,backref="classes")
def __repr__(self):
return "班级名：【%s】"%self.class_name
class Student(Base):
"学生"
__tablename__ ="student"
stu_id = Column(Integer, primary_key=True)
stu_name = Column(String(32), nullable=False, unique=True)
QQ = Column(Integer(), nullable=False)
def __repr__(self):
return "学生名：【%s】"%self.stu_name
class Lesson(Base):
"课节"
__tablename__ = "lesson"
lesson_id = Column(Integer, primary_key=True)
lesson_name = Column(String(32), nullable=False, unique=True)
def __repr__(self):
return "节次名：【%s】"%self.lesson_name
Base.metadata.create_all(engine)
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创建学习记录以及修改学生成绩：
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def add_studyrecord(self):
‘‘‘添加学习记录‘‘‘
class_name = input("\033[34;0m请输入要添加学习记录的班级名:\033[0m")
class_obj = self.session.query(Class).filter_by(class_name=class_name).first()
if class_obj and class_obj.teachers[0] == self.teacher_obj: # 输入的班级名存在且在属于当前老师管理
lesson_name = input("\033[34;0m请输入添加学习记录的课节名（lesson）:\033[0m")
lesson_obj = self.session.query(Lesson).filter_by(lesson_name=lesson_name).first()
if lesson_obj: # 输入的lesson名字存在
class_m2m_lesson_obj = self.session.query(Class_m2m_Lesson).filter(Class_m2m_Lesson.class_id == class_obj.class_id). \
filter(Class_m2m_Lesson.lesson_id == lesson_obj.lesson_id).first()
if class_m2m_lesson_obj: # 班级对应的课lesson表数据存在
study_record_obj = self.session.query(Study_record).filter_by(class_m2m_lesson_id=class_m2m_lesson_obj.id).first()
if not study_record_obj: # 上课记录为创建
for student_obj in class_obj.students:
status = input("输入学生 %s 的上课状态（yes/no）："%student_obj.stu_name)
study_record_new = Study_record(class_m2m_lesson_id=class_m2m_lesson_obj.id,
stu_id=student_obj.stu_id,
status=status)
self.session.add(study_record_new)
self.session.commit()
else:
print("\33[31;1m系统错误：当前上课记录已经创建\33[0m")
else:
print("\33[31;1m系统错误：当前班级的lesson课节未创建\33[0m")
else:
print("\33[31;1m系统错误：lesson未创建\33[0m")
else:
print("\33[31;1m输入错误：班级不存在或没有权限管理此班级\33[0m")
def modify_scores(self):
‘‘‘修改成绩‘‘‘
class_name = input("\033[34;0m请输入学习记录的班级名:\033[0m")
class_obj = self.session.query(Class).filter_by(class_name=class_name).first()
if class_obj and class_obj.teachers[0] == self.teacher_obj: # 输入的班级名存在且在属于当前老师管理
lesson_name = input("\033[34;0m请输入学习记录的课节名（lesson）:\033[0m")
lesson_obj = self.session.query(Lesson).filter_by(lesson_name=lesson_name).first()
if lesson_obj: # 输入的lesson名字存在
class_m2m_lesson_obj = self.session.query(Class_m2m_Lesson).filter(
Class_m2m_Lesson.class_id == class_obj.class_id). \
filter(Class_m2m_Lesson.lesson_id == lesson_obj.lesson_id).first()
if class_m2m_lesson_obj: # 班级对应的课lesson表数据存在
while True:
study_record_objs = self.session.query(Study_record).filter(
Study_record.class_m2m_lesson_id==class_m2m_lesson_obj.id).all()
for obj in study_record_objs:
print(obj)
student_name = input("\033[34;0m输入要修改成绩的学生名：[Q 退出]\33[0m")
if student_name == "q" or student_name == "Q":break
student_obj = self.session.query(Student).filter_by(stu_name=student_name).first()
if student_obj:
study_record_obj = self.session.query(Study_record).filter(
Study_record.class_m2m_lesson_id==class_m2m_lesson_obj.id).filter(
Study_record.stu_id == student_obj.stu_id).first()
if study_record_obj: # 上课记录存在
score = input("\033[34;0m输入修改后的成绩\33[0m")
study_record_obj.score= score
self.session.commit()
else:
print("\33[31;1m系统错误：当前上课记录已经创建\33[0m")
else:
print("\33[31;1m系统错误：当前班级的lesson课节未创建\33[0m")
else:
print("\33[31;1m系统错误：lesson未创建\33[0m")
else:
print("\33[31;1m输入错误：班级不存在或没有权限管理此班级\33[0m")
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上面的两段代码实现了主要的功能，其他的功能都是套路，都一样。。。。
完整代码地址--》》https://coding.net/u/James_Lian/p/Whaterver/git/tree/master
Python开发【项目】：学员管理系统（mysql）
标签：tab ase back 手动 cond syn def second 自己的