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Database connection and session management for Neon Postgres
"""
import os
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from sqlalchemy.pool import NullPool
import logging
logger = logging.getLogger(__name__)
# Get database URL from environment
DATABASE_URL = os.getenv("NEON_POSTGRES_URL")
if not DATABASE_URL:
logger.warning("NEON_POSTGRES_URL not set. Database features will be disabled.")
engine = None
SessionLocal = None
else:
# Create engine with proper connection pooling for Neon
engine = create_engine(
DATABASE_URL,
poolclass=NullPool, # Use NullPool for serverless environments
echo=False, # Set to True for SQL debugging
connect_args={
"connect_timeout": 10,
}
)
# Create session factory
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
logger.info("Database engine created successfully")
# Base class for models
Base = declarative_base()
def get_db():
"""
Dependency function to get database session
Usage in FastAPI:
@app.get("/items")
def read_items(db: Session = Depends(get_db)):
...
"""
if SessionLocal is None:
raise RuntimeError("Database is not configured. Set NEON_POSTGRES_URL environment variable.")
db = SessionLocal()
try:
yield db
finally:
db.close()
def init_db():
"""
Initialize database tables
Call this on application startup
"""
if engine is None:
logger.warning("Database engine is None. Skipping database initialization.")
return
try:
Base.metadata.create_all(bind=engine)
logger.info("Database tables created successfully")
except Exception as e:
logger.error(f"Error creating database tables: {str(e)}")
raise
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