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894fa47 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | """
Database connection and session management.
Handles SQLAlchemy engine and session creation.
"""
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from app.config import settings
# Create database engine
# Echo=True shows SQL queries in console (useful for debugging)
engine = create_engine(
settings.database_url,
echo=True if settings.environment == "development" else False,
pool_pre_ping=True, # Verify connections before using
pool_size=5, # Number of connections to keep
max_overflow=10 # Maximum overflow connections
)
# Create session factory
SessionLocal = sessionmaker(
autocommit=False,
autoflush=False,
bind=engine
)
# Base class for all database models
Base = declarative_base()
def get_db():
"""
Dependency that provides database session to route handlers.
Automatically closes session after request completes.
Usage:
@app.get("/endpoint")
def endpoint(db: Session = Depends(get_db)):
# Use db here
"""
db = SessionLocal()
try:
yield db
finally:
db.close() |