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XPPL/test2.py

49 lines
1.2 KiB
Python

from sqlalchemy import create_engine
from sqlalchemy import Table, Column, Integer, String, ForeignKey, Sequence
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, relationship
Base = declarative_base()
teachers_lessons = Table(
"teachers_lessons",
Base.metadata,
Column("fk_teacher", Integer, ForeignKey("teachers.id")),
Column("fk_lesson", Integer, ForeignKey("lessons.id")),
)
class Teacher(Base):
__tablename__ = "teachers"
id = Column("id", Integer, Sequence("teachers_id_seq"), primary_key=True)
name = Column("name", String(50), nullable=False)
lessons = relationship(
"Lesson",
backref="teachers",
secondary=teachers_lessons
)
class Lesson(Base):
__tablename__ = "lessons"
id = Column("id", Integer, Sequence("lessons_id_seq"), primary_key=True)
name = Column("name", String(50), nullable=False)
engine = create_engine('rqlite+pyrqlite://localhost:4001/', echo=True)
Base.metadata.create_all(engine)
Session = sessionmaker(bind=engine)
if __name__ == "__main__":
t2 = s.query(Teacher).filter_by(name='NEWNEW').first()
t2.lessons.clear()
s.commit()