81 lines
2.9 KiB
Python
81 lines
2.9 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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# 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("connected to database!")
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return engine
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except OperationalError as e:
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print(f"database connection failed: {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("created tables")
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else:
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print("error no connection")
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except Exception as e:
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print(f"unexpected error during initial database creation: {e}")
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# Track-Tabelle
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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)
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driver_id = Column(Integer, ForeignKey('driver.id'), nullable=False)
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date = Column(Date, nullable=True)
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distance = Column(Float, nullable=False, default=0.0)
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speed = Column(Float, nullable=False, default=0.0)
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# Beziehungen
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driver = relationship("Driver", back_populates="tracks", foreign_keys=[driver_id])
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vehicle = relationship("Vehicle", back_populates="tracks", foreign_keys=[vehicle_id])
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waypoints = relationship('Waypoint', back_populates='track', lazy=True)
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# Waypoint-Tabelle
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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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# Beziehung zu Track
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track = relationship("Track", back_populates="waypoints")
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# Driver-Tabelle
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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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# Beziehung zu Tracks
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tracks = relationship("Track", back_populates="driver", overlaps="vehicle_tracks")
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# Vehicle-Tabelle
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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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licenseplate = Column(String, nullable=True)
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# Beziehung zu Tracks
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tracks = relationship("Track", back_populates="vehicle", overlaps="driver_tracks")
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