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58 lines
1.3 KiB
Python
58 lines
1.3 KiB
Python
7 years ago
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from sqlalchemy import create_engine
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from sqlalchemy import Table, Column, Integer, String, ForeignKey, Sequence
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from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.orm import sessionmaker, relationship
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Base = declarative_base()
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teachers_lessons = Table(
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"teachers_lessons",
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Base.metadata,
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Column("fk_teacher", Integer, ForeignKey("teachers.id")),
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Column("fk_lesson", Integer, ForeignKey("lessons.id")),
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)
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class Teacher(Base):
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__tablename__ = "teachers"
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id = Column("id", Integer, Sequence("teachers_id_seq"), primary_key=True)
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name = Column("name", String(50), nullable=False)
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lessons = relationship(
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"Lesson",
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backref="teachers",
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secondary=teachers_lessons
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)
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class Lesson(Base):
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__tablename__ = "lessons"
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id = Column("id", Integer, Sequence("lessons_id_seq"), primary_key=True)
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name = Column("name", String(50), nullable=False)
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engine = create_engine('rqlite+pyrqlite://localhost:4001/', echo=True)
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Base.metadata.create_all(engine)
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Session = sessionmaker(bind=engine)
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if __name__ == "__main__":
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s = Session()
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t1 = Teacher(name="NEWNEW")
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t1.lessons = [
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Lesson(name="fpro"),
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Lesson(name="math")
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]
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s.add(t1)
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s.commit()
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t2 = s.query(Teacher).filter_by(name='NEWNEW').first()
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t2.lessons.clear()
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s.commit()
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