70 lines
2.8 KiB
Python
70 lines
2.8 KiB
Python
from sqlalchemy import create_engine, Column, ForeignKey, Integer, String, Date, Float, DateTime
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from sqlalchemy.orm import relationship, sessionmaker
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from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.pool import NullPool
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from sqlalchemy.exc import OperationalError
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Base = declarative_base()
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# TODO: build license plate into car api construct and rebuild api to fit new data
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# Funktion zur Herstellung einer Verbindung zur Datenbank
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def db_connect():
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try:
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engine = create_engine("postgresql://example:example@localhost/geotrack", poolclass=NullPool)
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# Überprüfe die Verbindung
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with engine.connect() as connection:
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print("Verbindung zur Datenbank erfolgreich!")
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return engine
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except OperationalError as e:
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print(f"Fehler bei der Verbindung zur Datenbank: {e}")
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return None
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# Funktion zur Erstellung der Tabellen
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def create_table(engine):
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try:
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if engine is not None:
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Base.metadata.create_all(engine)
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print("Tabellen wurden erfolgreich erstellt!")
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else:
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print("Keine Verbindung zur Datenbank verfügbar.")
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except Exception as e:
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print(f"Fehler bei der Tabellenerstellung: {e}")
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class Track(Base):
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__tablename__ = 'track'
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id = Column(Integer, primary_key=True, autoincrement=True)
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trackName = Column(String(200), nullable=True)
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vehicle_id = Column(Integer, ForeignKey('vehicle.id'), nullable=False, default=1)
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driver_id = Column(Integer, ForeignKey('driver.id'), nullable=False, default=1)
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date = Column(Date, nullable=True)
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distance = Column(Float, nullable=False, default=0)
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speed = Column(Float, nullable=False, default=0)
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driver = relationship("Driver", backref="vehicle_tracks") # 'vehicle_tracks' als backref
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vehicle = relationship("Vehicle", backref="driver_tracks") # 'driver_tracks' als backref
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waypoints = relationship('Waypoint', backref='track', lazy=True)
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class Waypoint(Base):
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__tablename__ = 'waypoint'
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id = Column(Integer, primary_key=True, autoincrement=True)
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lat = Column(Float, nullable=False)
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lon = Column(Float, nullable=False)
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ele = Column(Float, nullable=False)
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speed = Column(Float, nullable=True)
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time = Column(DateTime, nullable=True)
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track_id = Column(Integer, ForeignKey('track.id'), nullable=False)
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class Driver(Base):
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__tablename__ = 'driver'
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id = Column(Integer, primary_key=True)
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name = Column(String, nullable=False)
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tracks = relationship("Track", back_populates="driver") # Beziehung von Track -> Driver
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class Vehicle(Base):
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__tablename__ = 'vehicle'
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id = Column(Integer, primary_key=True)
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name = Column(String, nullable=False)
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tracks = relationship("Track", back_populates="vehicle") # Beziehung von Track -> Vehicle
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