SQLAlchemy with FastAPI

SQLAlchemy ORM with FastAPI

from sqlalchemy import create_engine, Column, Integer, String, DateTime
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, Session
from datetime import datetime

DATABASE_URL = "postgresql://user:pass@localhost/mydb"
engine       = create_engine(DATABASE_URL)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base         = declarative_base()

class Post(Base):
    __tablename__ = "posts"
    id         = Column(Integer, primary_key=True, index=True)
    title      = Column(String, nullable=False)
    body       = Column(String, nullable=False)
    created_at = Column(DateTime, default=datetime.utcnow)

Base.metadata.create_all(bind=engine)

# CRUD operations
@app.get("/posts/{id}")
def get_post(id: int, db: Session = Depends(get_db)):
    post = db.query(Post).filter(Post.id == id).first()
    if not post:
        raise HTTPException(404, "Post not found")
    return post

@app.post("/posts", status_code=201)
def create_post(data: PostCreate, db: Session = Depends(get_db)):
    post = Post(**data.model_dump())
    db.add(post)
    db.commit()
    db.refresh(post)
    return post