sqlservice

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The missing SQLAlchemy ORM interface.

Links

• Project: https://github.com/dgilland/sqlservice
• Documentation: http://sqlservice.readthedocs.io
• PyPI: https://pypi.python.org/pypi/sqlservice/
• Github Actions: https://github.com/dgilland/sqlservice/actions

Introduction

So what exactly is sqlservice and what does "the missing SQLAlchemy ORM interface" even mean? SQLAlchemy is a fantastic library and features a superb ORM layer. However, one thing SQLAlchemy lacks is a unified interface for easily interacting with your database through your ORM models. This is where sqlservice comes in. It's interface layer on top of SQLAlchemy's session manager and ORM layer that provides a single point to manage your database connection/session, create/reflect/drop your database objects, and easily persist/destroy model objects.

Features

This library is meant to enhance your usage of SQLAlchemy. SQLAlchemy is great and this library tries to build upon that by providing useful abstractions on top of it.

• Database client that helps manage an ORM scoped session.
• Base class for a declarative ORM Model that makes updating model columns and relationships easier and converting to a dictionary a breeze.
• Decorator-based event register for SQLAlchemy ORM events that can be used at the model class level. No need to register the event handler outside of the class definition.
• An application-side nestable transaction context-manager that helps implement pseudo-subtransactions for those that want implicit transaction demarcation, i.e. session autocommit, without using session subtransactions.
• And more!

Requirements

• Python >= 3.7
• SQLAlchemy <http://www.sqlalchemy.org/>_ >= 1.0.0

Quickstart

First, install using pip:

::

pip3 install sqlservice

Then, define some ORM models:

.. code-block:: python

import re

from sqlalchemy import Column, ForeignKey, orm, types

from sqlservice import declarative_base, event


Model = declarative_base()

class User(Model):
    __tablename__ = "user"

    id = Column(types.Integer(), primary_key=True)
    name = Column(types.String(100))
    email = Column(types.String(100))
    phone = Column(types.String(10))

    roles = orm.relation("UserRole")

    @event.on_set("phone", retval=True)
    def on_set_phone(self, value, oldvalue, initator):
        # Strip non-numeric characters from phone number.
        return re.sub("[^0-9]", "", value)

class UserRole(Model):
    __tablename__ = "user_role"

    id = Column(types.Integer(), primary_key=True)
    user_id = Column(types.Integer(), ForeignKey("user.id"), nullable=False)
    role = Column(types.String(25), nullable=False)

Next, configure the database client:

.. code-block:: python

from sqlservice import SQLClient

config = {
    "SQL_DATABASE_URI": "sqlite:///db.sql",
    "SQL_ISOLATION_LEVEL": "SERIALIZABLE",
    "SQL_ECHO": True,
    "SQL_ECHO_POOL": False,
    "SQL_CONVERT_UNICODE": True,
    "SQL_POOL_SIZE": 5,
    "SQL_POOL_TIMEOUT": 30,
    "SQL_POOL_RECYCLE": 3600,
    "SQL_MAX_OVERFLOW": 10,
    "SQL_AUTOCOMMIT": False,
    "SQL_AUTOFLUSH": True,
    "SQL_EXPIRE_ON_COMMIT": True
}

db = SQLClient(config, model_class=Model)

Prepare the database by creating all tables:

.. code-block:: python

db.create_all()

Finally (whew!), start interacting with the database.

Insert a new record in the database:

.. code-block:: python

data = {'name': 'Jenny', 'email': '[email protected]', 'phone': '555-867-5309'}
user = db.User.save(data)

Fetch records:

.. code-block:: python

assert user is db.User.get(data.id)
assert user is db.User.find_one(id=user.id)
assert user is db.User.find(User.id == user.id)[0]

Serialize to a dict:

.. code-block:: python

assert user.to_dict() == {
    "id": 1,
    "name": "Jenny",
    "email": "[email protected]",
    "phone": "5558675309"
}

assert dict(user) == user.to_dict()

Update the record and save:

.. code-block:: python

user.phone = '222-867-5309'
db.User.save(user)

Upsert on primary key automatically:

.. code-block:: python

assert user is db.User(
    {
        "id": 1,
        "name": "Jenny",
        "email": "[email protected]",
        "phone": "5558675309"
    }
)

Destroy the model record:

.. code-block:: python

db.User.destroy(user)
# OR db.User.destroy([user])
# OR db.User.destroy(user.id)
# OR db.User.destroy([user.id])
# OR db.User.destroy(dict(user))
# OR db.User.destroy([dict(user)])

For more details, please see the full documentation at http://sqlservice.readthedocs.io.

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