dataclasses-sql

Using dataclasses with SQL databases.

Examples:

import dataclasses
import sqlalchemy
import dataclasses_sql

@dataclasses.dataclass
class Car:
    brand: str = dataclasses.field(metadata={"key": True})
    model: str = dataclasses.field(metadata={"key": True})
    milage: float

# Connect to database
engine = sqlalchemy.create_engine("sqlite:///:memory:")
metadata = sqlalchemy.MetaData(engine)
metadata.reflect()

# Insert
car = Car("Kia", "Ceed", 15678)
dataclasses_sql.insert(metadata, car, check_exists=True)

car = Car("Ford", "Mustang", 4032)
dataclasses_sql.insert(metadata, car, check_exists=True)

# Select
builder = dataclasses_sql.SelectStatementBuilder()
builder.add_column(Car, "mileage")
builder.add_clause(Car, "brand", "Kia")
statement = builder.build()

with metadata.bind.begin() as conn:
    row = conn.execute(statement).fetchone()
    print(row)

Installation

Easiest way to install using pip:

pip install dataclasses-sql

For development installation from the git repository::

git clone git@github.com/ppinard/dataclasses-sql.git
cd dataclasses-sql
pip install -e .

Release notes

0.3

• Add delete function

0.2

• Add update function

Contributors

License

The library is provided under the MIT license license.

Copyright (c) 2020, Philippe Pinard