---
title: "SqlAlchemy Models"
description: "My Notes about using sqlalchemy models"
date: 2019-12-21
published: true
tags:
  - python
template: blog-post
---


## Make a connection

```python
from sqlalchemy import create_engine
def get_engine():
    return create_engine("sqlite:///mode_examples.sqlite")
```

## Make a session

```python
from sqlalchemy.orm import sessionmaker
def get_session():
    con = get_engine()
    Base.bind = con
    Base.metadata.create_all()
    Session = sessionmaker(bind=con)
    session = Session()
    return session
```

## Make a Base Class

```python
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()
Base.metadata.bind = get_engine()
```

## Make your First Model

```python
class User(Base):
    __tablename__ = "users"
    username = Column('username', Text())
    firstname = Column('firstname', Text())
    lastname = Column('lastname', Text())
```

## Make your own Base Class to inherit From

```python
class MyBaseHelper:
    def to_dict(self):
        return {k: v for k, v in self.__dict__.items() if k[0] != "_"}

    def update(self, **attrs):
        for key, value in attrs.items():
            if hasattr(self, key):
                setattr(self, key, value)
```

## Use the Custom Base Class

```python
class User(Base, MyBaseHelper):
    __tablename__ = "users"
    username = Column('username', Text())
    firstname = Column('firstname', Text())
    lastname = Column('lastname', Text())
```