LightORM 💡🧺🗄️

It is what the name means. Light yet Do Stuffs (Almost) . Yet another, super lightweight MySQL ORM (Object-Relational Mapping) in Python.

💾 How to Install

pip install lightorm

If you find this project interesting, you can always star it. :D

📷 A Background for LightORM

The Dall-E prompt was

light yagami from death note is writing  code as darth vader yakuza style

🔌 Connecting and Querying

LightORM is designed to reduce the overhead of doing everything and focus on doing things in a very light way. First connect with the database,

import os
from dotenv import load_dotenv

load_dotenv()

from lightorm import Database, Field, _AND

table_name = 'person_table'
db = Database(
    db_name=os.environ.get('DB_NAME'),
    user=os.environ.get('DB_USER'),
    password=os.environ.get('DB_PASSWORD'),
    host=os.environ.get('DB_HOST'),
    port=int(os.environ.get('DB_PORT'))
)

Here, the database configs are read from .env file. And the db is instantiated.

💉🗄️ Insert a Record

Inserting a record is quiet simple.

person = {
    'name': 'John Doe',
    'age': 23,
    'address': 'LA',
    'hobby': 'writing'
    }
row_id = db.table(table_name).insert(**person)

If successful, the insert(**person) will return the row-id

🗃️🗄️ Insert Multiple Records

Inserting multiple record is simply feeding the insert_many method with the list of the dictionary of the records to be inserted.

persons = [
    {
    'name': 'John Doe',
    'age': 23,
    'address': 'LA',
    'hobby': 'writing'
    },
    {
    'name': 'Jane Doe',
    'age': 27,
    'address': 'Kentucky',
    'hobby': 'sleeping'
    }
]
record_inserted = db.table(table_name).insert_many(rows=persons)

Upon successful insertion, insert_many returns the number of rows inserted.

🗄️🧩 Getting Data Back (SELECT)

For getting all data back, simply

users = db.table(table_name).select().execute()

or simply with empty where clause [ not suggested, but it will work]

users = db.table(table_name).select().where().execute()

Note, there is an extra method execute, required for the operation.

🥣🗄️ Filtering

lightorm is tested with several filtering, and it is simply chaining filtering clauses. Let's see

🥣🗄️ Filtering users by age and hobby

from lightorm import Field,_AND

...
...

users = db.table(table_name).select().where([
    Field('age').eq(33), _AND,
    Field('hobby').eq('programming')
]).execute()

🥣🗄️ Filtering users where age is less than 33

users = db.table(table_name).select().where([
    Field('age').lt(35)
]).execute()
print('users:', users)

🥣🗄️ Filtering users where adress is in `['Dhaka','Khulna']

users = db.table(table_name).select().where([
    Field('address').find_in(['Dhaka', 'Khulna'])
]).execute()
print('users:', users)

🚥🗄️ Updating the Records

update() method receivers key-val dict for fields to be changed. Simply,

v_set = {
    'age': 65,
    'hobby': 'sleeping'
}
user_count = db.table(table_name).update(**v_set).where([
    Field('address').eq('Dhaka')
]).execute()
print('Affected Row:', user_count)

v_set is the dict that is the followed by SET value in sql query. After successful query, it returns rows affected.

✏️🗄️ Deleting Records

delete() works just like the select() method. It returns boolean True if is the query is successfully executed.

delete_flag = self.db.table(self.table_name).delete().where([
    Field('hobby').eq('sleeping')
]).execute()
print('Delete-Flag:', delete_flag)

📜 Almost Full Example

import os
import random
import unittest
from dotenv import load_dotenv
from lightorm import Database, Field, _AND

load_dotenv()


class TestTinyOrm(unittest.TestCase):
    table_name = os.environ.get('TABLE_NAME')
    db = Database(
        db_name=os.environ.get('DB_NAME'),
        user=os.environ.get('DB_USER'),
        password=os.environ.get('DB_PASSWORD'),
        host=os.environ.get('DB_HOST'),
        port=int(os.environ.get('DB_PORT'))
    )
    first_name = ['John', 'Jane', 'Jason', 'Guido', 'Martin', 'Rob']
    last_name = ['Doe', 'Dee', 'Mraz', 'Van Russom', 'Fowler', 'Pike']
    addresses = ['Dhaka', 'LA', 'Kentucky', 'Madrid', 'Khulna', 'Sylhet']
    hobbies = ['singing', 'art', ' gaming', 'programming', 'writing', 'sleeping']

    def get_name(self):
        name = '{} {}'.format(random.choice(self.first_name),
                              random.choice(self.last_name))
        return name

    def get_age(self):
        return random.choice([i for i in range(25, 60)])

    def get_address(self):
        return random.choice(self.addresses)

    def get_hobby(self):
        return random.choice(self.hobbies)

    def test_insert(self):
        person = {
            'name': self.get_name(),
            'age': self.get_age(),
            'address': self.get_address(),
            'hobby': self.get_hobby()
        }
        row_id = self.db.table(self.table_name).insert(**person)
        print('row-id:', row_id)

    def test_insert_many(self):
        persons = []
        for i in range(1, 50):
            person = {
                'name': self.get_name(),
                'age': self.get_age(),
                'address': self.get_address(),
                'hobby': self.get_hobby()
            }
            persons.append(person)
        count = self.db.table(self.table_name).insert_many(rows=persons)
        print('recored created:', count)

    def test_get_users(self):
        users = self.db.table(self.table_name).select().where().execute()
        print('users:', users)

    def test_get_user_by_age_and_hobby(self):
        users = self.db.table(self.table_name).select().where([
            Field('age').eq(33), _AND,
            Field('hobby').eq('art')
        ]).execute()
        print('users:', users)

    def test_get_users_where_age_lt_33(self):
        users = self.db.table(self.table_name).select().where([
            Field('age').lt(35)
        ]).execute()
        print('users:', users)

    def test_get_users_where_age_is_in_list_33(self):
        users = self.db.table(self.table_name).select().where([
            Field('age').find_in([33])
        ]).execute()
        print('users:', users)

    def test_get_user_where_address_is_in_dhaka_or_sylhet(self):
        users = self.db.table(self.table_name).select().where([
            Field('address').find_in(['Dhaka', 'Khulna'])
        ]).execute()
        print('users:', users)

    def test_update_users_age_to_50_if_address_is_dhaka(self):
        v_set = {
            'age': 65,
            'hobby': 'sleeping'
        }
        user_count = self.db.table(self.table_name).update(**v_set).where([
            Field('address').eq('Dhaka')
        ]).execute()
        print('Affected Row:', user_count)

    def test_delete_users_where_hobby_eq_art(self):
        delete_flag = self.db.table(self.table_name).delete().where([
            Field('hobby').eq('sleeping')
        ]).execute()
        print('Delete-Flag:', delete_flag)

    def test_find_not_in(self):
        users = self.db.table(self.table_name).select().where([
            Field('age').find_not_in([49, 39, 28])
        ]).execute()
        print('users:', len(users))

    def test_paginated_query(self):
        size = 10
        users = self.db.table(self.table_name).select().where(
            [
                Field('age').eq(65)
            ]
        ).paginate(0, size).execute()
        print('len(users):', len(users))
        print('users:', users)


if __name__ == '__main__':
    unittest.main()

🔮 Upcoming Features

1. Raw SQL execution.
2. Adding Pagination and Sorting
3. Adding proper Logging and debugging messages.
4. Adding Aggregate Function function in the ORM.

🧚 Inspiration

Peewee, SQLalchemy djangoORM and all the other ORMs out there, making Developers life easier.

Change logs

0.0.6

• Adding find_not_in() method.

0.0.7

• Adding paginate() method.