Have you used object-relational mapping (ORM) systems?

Yes, I have experience using ORM in Python. ORM (Object-Relational Mapping) allows working with a database through objects without directly using SQL queries. For example, a popular ORM is SQLAlchemy. It enables describing tables as classes and records as objects of these classes.

Example with SQLAlchemy:

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

Base = declarative_base()

class User(Base):
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True)
    name = Column(String)

engine = create_engine('sqlite:///:memory:')
Base.metadata.create_all(engine)
Session = sessionmaker(bind=engine)
session = Session()

# Creating a new user
new_user = User(name='Ivan')
session.add(new_user)
session.commit()

# Querying users
users = session.query(User).filter_by(name='Ivan').all()
print(users)

ORM simplifies data handling, improves readability, and reduces errors associated with manual SQL writing.