orm-mysql

MySql ORM

A simple Object Relational Mapper for MySql. Works with existing tables and the schema of the tables are automatically inferred.

Install

pip install orm-mysql

Connect to MySql

from orm import Table

Table.connect(config_dict={
    'host': '<host_here>',
    'port': 3306,
    'user': '<user>',
    'password': '<password>',
    'database': '<database>'
})

Create a class for a table

Create a class that inherits from Table. Initialize the class variable table_name with the name of the table, here 'student'

from orm import Table
Table.connect(config_dict=CONFIG)

class Student(Table):
    table_name = 'student'

OR use get_table()

from orm import Table, get_table
Table.connect(config_dict=CONFIG)

Student = get_table('student')

Insert data

Using save()

new_student = Student(name='hrushi', age=19, gender='M')
new_student.age = 20
new_student.save()

Using create()

new_student = Student.create(name='hrushi', age=19, gender='M')

Query data

Using where()

students = Student.where(age=19, gender='F')

for stu in students:
    print(stu.name)

Using find()

Find a single record based on PRIMARY KEY.

# find student where id(PK) = 2
student = Student.find(2)

print(student.name)

Delete a record

student = Student.find(2)
student.destroy()

Relations

has_many and belongs_to can be used to show relationships between tables.

from orm import Table, has_many, belongs_to

class Article(Table):
    table_name = 'articles'

    relations = [
        belongs_to(name='author', _class='Author', foreign_key='author_id', primary_key='id')
    ]

class Author(Table):
    table_name = 'authors'

    relations = [
        has_many(name='articles', _class='Article', foreign_key='author_id')
    ]

Get all the books written a Author

auth = Author.find(2)
articles = auth.articles()
for art in articles:
    print(art.title)

Get Author of a book

art = Article.find(5)
author = art.author()
print(author.name)