mirror of
https://github.com/ferdzo/iotDashboard.git
synced 2026-04-05 17:16:26 +00:00
84 lines
1.8 KiB
Python
84 lines
1.8 KiB
Python
"""
|
|
Database session management for FastAPI with SQLAlchemy.
|
|
|
|
Uses dependency injection pattern for database sessions.
|
|
"""
|
|
from collections.abc import Generator
|
|
from contextlib import contextmanager
|
|
|
|
from sqlalchemy import create_engine
|
|
from sqlalchemy.orm import Session, sessionmaker
|
|
|
|
from config import config
|
|
|
|
# Create engine with connection pooling
|
|
engine = create_engine(
|
|
config.DATABASE_URL,
|
|
pool_pre_ping=True,
|
|
pool_size=5,
|
|
max_overflow=10,
|
|
echo=False,
|
|
)
|
|
|
|
SessionLocal = sessionmaker(
|
|
autocommit=False,
|
|
autoflush=False,
|
|
bind=engine,
|
|
)
|
|
|
|
|
|
def get_db() -> Generator[Session]:
|
|
"""
|
|
FastAPI dependency that provides a database session.
|
|
|
|
Usage in endpoints:
|
|
@app.post("/devices")
|
|
async def create_device(db: Session = Depends(get_db)):
|
|
device = Device(...)
|
|
db.add(device)
|
|
db.commit()
|
|
return device
|
|
|
|
The session is automatically closed after the request completes.
|
|
"""
|
|
db = SessionLocal()
|
|
try:
|
|
yield db
|
|
finally:
|
|
db.close()
|
|
|
|
|
|
@contextmanager
|
|
def get_db_context():
|
|
"""
|
|
Context manager for database sessions outside of FastAPI endpoints.
|
|
Usage:
|
|
with get_db_context() as db:
|
|
device = db.query(Device).first()
|
|
"""
|
|
db = SessionLocal()
|
|
try:
|
|
yield db
|
|
db.commit()
|
|
except Exception:
|
|
db.rollback()
|
|
raise
|
|
finally:
|
|
db.close()
|
|
|
|
|
|
def check_db_connection() -> bool:
|
|
"""
|
|
Check if database connection is working.
|
|
|
|
Returns:
|
|
True if connection successful, False otherwise
|
|
"""
|
|
try:
|
|
with engine.connect() as conn:
|
|
conn.execute("SELECT 1")
|
|
return True
|
|
except Exception as e:
|
|
print(f"Database connection failed: {e}")
|
|
return False
|