simple-orm

python-sqlite-orm

A Python object relational mapper for SQLite.

Install

pip install simple-orm

Usage

Following a basic tutorial to demonstrate how to use the ORM.

1. Define a Post model in a post.py file.

   # post.py
   from orm import Model
   
   class Post(Model):
   
       text = str  # other datatypes: int, float
   
       def __init__(self, text):
           self.text = text
   
   

2. Import Database to create a data access object.

   >>> from orm import Database
   >>> db = Database('db.sqlite')  # indicating a database file.
   

3. Import the Post model and link it to the database.

   >>> from post import Post
   >>> Post.db = db  # see another approach in tests.py
   

4. Create a post and save it in the staging area (without commit) of database.

   >>> post = Post('Hello World').save()
   >>> print(post.id)  # auto generated id
   1
   

5. Change the hello world post and update it in the database.

   >>> post = Post.manager().get(id=1)
   >>> post.text = 'Hello Mundo'
   >>> post.update()
   >>> post.text
   Hello Mundo
   

6. Commit all staged operations (save and update) to the database.

   >>> db.commit()
   

7. Delete the object and commit.

   >>> post.delete()
   >>> db.commit()
   

8. Create a manager that can perform CRUD operations in the database.

   >>> objects = Post.manager(db)
   

9. Save and get a post.

   >>> objects.save(Post('Hello', 'World'))
   >>> objects.get(2)  # get by id from the staging area
   {'text': 'World', 'id': 2, 'title': 'Hello'}
   

10. Close the database without commit the changes

    >>> db.close()
    

11. Get all posts from database.

    >>> list(objects.all())  # return a "empty" generator
    []
    

Linter

Check code lint:

pip install pylint
pylint orm.py

Contributing

See CONTRIBUTING.

License

The MIT License.