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from typing import Optional
from sqlmodel import Field, Session, SQLModel, create_engine, select
class Hero(SQLModel, table=True):
id: Optional[int] = Field(default=None, primary_key=True)
name: str = Field(index=True)
secret_name: str
age: Optional[int] = Field(default=None, index=True)
sqlite_file_name = "database.db"
sqlite_url = f"sqlite:///{sqlite_file_name}"
engine = create_engine(sqlite_url, echo=True)
def create_db_and_tables():
SQLModel.metadata.create_all(engine)
def create_heroes():
hero_1 = Hero(name="Deadpond", secret_name="Dive Wilson")
hero_2 = Hero(name="Spider-Boy", secret_name="Pedro Parqueador")
hero_3 = Hero(name="Rusty-Man", secret_name="Tommy Sharp", age=48)
hero_4 = Hero(name="Tarantula", secret_name="Natalia Roman-on", age=32)
hero_5 = Hero(name="Black Lion", secret_name="Trevor Challa", age=35)
hero_6 = Hero(name="Dr. Weird", secret_name="Steve Weird", age=36)
hero_7 = Hero(name="Captain North America", secret_name="Esteban Rogelios", age=93)
with Session(engine) as session:
session.add(hero_1)
session.add(hero_2)
session.add(hero_3)
session.add(hero_4)
session.add(hero_5)
session.add(hero_6)
session.add(hero_7)
session.commit()
def update_heroes():
with Session(engine) as session:
statement = select(Hero).where(Hero.name == "Spider-Boy")
results = session.exec(statement)
hero_1 = results.one()
print("Hero 1:", hero_1)
statement = select(Hero).where(Hero.name == "Captain North America")
results = session.exec(statement)
hero_2 = results.one()
print("Hero 2:", hero_2)
hero_1.age = 16
hero_1.name = "Spider-Youngster"
session.add(hero_1)
hero_2.name = "Captain North America Except Canada"
hero_2.age = 110
session.add(hero_2)
session.commit()
session.refresh(hero_1)
session.refresh(hero_2)
print("Updated hero 1:", hero_1)
print("Updated hero 2:", hero_2)
def delete_heroes():
with Session(engine) as session:
statement = select(Hero).where(Hero.name == "Spider-Youngster") # (1)!
results = session.exec(statement) # (2)!
hero = results.one() # (3)!
print("Hero: ", hero) # (4)!
session.delete(hero) # (5)!
session.commit() # (6)!
print("Deleted hero:", hero) # (7)!
statement = select(Hero).where(Hero.name == "Spider-Youngster") # (8)!
results = session.exec(statement) # (9)!
hero = results.first() # (10)!
if hero is None: # (11)!
print("There's no hero named Spider-Youngster") # (12)!
# (13)!
def main():
create_db_and_tables()
create_heroes()
update_heroes()
delete_heroes()
if __name__ == "__main__":
main()
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