50 lines
1.4 KiB
Python
50 lines
1.4 KiB
Python
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from sqlalchemy import create_engine, Column, String, BigInteger, ForeignKey, TIMESTAMP, UniqueConstraint
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from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.orm import relationship, sessionmaker
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from datetime import datetime
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Base = declarative_base()
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class Token(Base):
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__tablename__ = 'tokens'
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id = Column(String(42), primary_key=True)
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name = Column(String(255), nullable=True)
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symbol = Column(String(32), nullable=True)
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total_supply = Column(String, nullable=True)
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class Pair(Base):
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__tablename__ = 'pairs'
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id = Column(String(42), primary_key=True)
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token0 = Column(String(42), ForeignKey('tokens.id'), nullable=False)
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token1 = Column(String(42), ForeignKey('tokens.id'), nullable=False)
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created_at = Column(TIMESTAMP, default=datetime.utcnow)
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# Ensuring the combination of token0, token1, and pool_address is unique
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__table_args__ = (UniqueConstraint('token0', 'token1', name='_token_pool_uc'),)
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# Relationships
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token0_rel = relationship("Token", foreign_keys=[token0])
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token1_rel = relationship("Token", foreign_keys=[token1])
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# Engine creation
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engine = create_engine('sqlite:///uniswap.db', echo=True)
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# Create tables
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Base.metadata.create_all(engine)
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# Create a session factory
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SessionLocal = sessionmaker(bind=engine)
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# Dependency to get a database session
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def get_session():
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session = SessionLocal()
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try:
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yield session
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finally:
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session.close()
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