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Database configuration and session management.
This module provides:
- Database engine creation
- Session management
- Dependency injection for FastAPI routes
"""
import os
from typing import Generator
from sqlmodel import Session, create_engine, SQLModel
# Get database URL from environment variable
# For Vercel serverless, use /tmp directory for SQLite
DATABASE_URL = os.getenv("DATABASE_URL")
if DATABASE_URL is None:
# Check if running on Vercel (serverless environment)
if os.getenv("VERCEL"):
# Use /tmp directory which is writable in Vercel serverless
DATABASE_URL = "sqlite:////tmp/todo.db"
else:
# Local development
DATABASE_URL = "sqlite:///./todo.db"
# Create database engine
# connect_args only needed for SQLite
connect_args = {"check_same_thread": False} if DATABASE_URL.startswith("sqlite") else {}
engine = create_engine(
DATABASE_URL,
echo=False, # Disable SQL query logging for serverless
connect_args=connect_args,
pool_pre_ping=True, # Verify connections before using
)
def create_db_and_tables():
"""Create all database tables."""
SQLModel.metadata.create_all(engine)
def get_session() -> Generator[Session, None, None]:
"""
Dependency function to provide database session to FastAPI routes.
Yields:
Session: SQLModel database session
Example:
@app.get("/items")
def get_items(session: Session = Depends(get_session)):
items = session.exec(select(Item)).all()
return items
"""
with Session(engine) as session:
yield session
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