Alex
6 years ago
5 changed files with 92 additions and 29 deletions
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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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