https://github.com/spokanetech/exploring_orms

Exploring Go GORM and Django ORM
https://github.com/spokanetech/exploring_orms

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Exploring Go GORM and Django ORM

• Host: GitHub
• URL: https://github.com/spokanetech/exploring_orms
• Owner: SpokaneTech
• Created: 2024-07-15T23:21:19.000Z (6 months ago)
• Default Branch: main
• Last Pushed: 2024-10-04T04:49:03.000Z (3 months ago)
• Last Synced: 2024-11-08T01:45:02.919Z (2 months ago)
• Language: HTML
• Homepage: https://spokanetech.github.io/exploring_orms/
• Size: 200 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
---

marp: true

theme: gaia

style: |

  .columns {

    display: grid;

    grid-template-columns: repeat(2, minmax(0, 1fr));

    gap: 1rem;

  }

  section.small {

    font-size: 22px;

  }

---

## Exploring GORM: The Fantastic ORM for Go

and the Django ORM for all you Pythonistas

---

## Agenda

We'll cover three main ideas:

- What is an ORM and why should you be using one?

- How to use GORM

- How does GORM compare to other popular ORMs

  	- Django ORM

---

## What is an ORM?

**Object–relational mapping** is a technique for converting between relational databases and object-oriented programming languages.

| Database | Code |

| --- | --- |

| Table | Class / Model |

| Column | Field / Attribute |

| Relationships | Field / Attribute |

---

## Why use an ORM?

- Typed interaction with your database

- Speed up development time

- Prevent SQL-injection

- Auto migrations

- ➖ Higher level abstraction

- ➖ Can lead to poor performance (N+1, etc.)

---

## Relationships

- has one / belongs to

- has many

- many to many

- polymorphism

- single-table inheritance

---

## Demo — Cars

- has one

    - vehicle and driver

- has many

    - vehicle and model

    - model and manufacturer

- many to many

    - model and parts

- polymorphism: gas and electric vehicles

- single-table inheritance

---

## Has many





- A `manufacturer` has many `vehicles`





![width:600px](./docs/mermaid-1-simple.png)





---

## Many to many





- A `part` can fit many `vehicles` and a `vehicle` can have many `parts`

- When using GORM AutoMigrate, GORM will create join tables automatically





![width:600px](./docs/mermaid-2-parts.png)





---

## Has one





- A `vehicle` has one driver, a `person`





![width:600px](./docs/mermaid-3-drivers.png)





---

## SQL vs. GORM vs. Django ORM functions

| SQL | GORM | GORM Gen | Django |

| --- | --- | --- | --- |

| SELECT * | `db.Select()` | `q.Person.Select()` | `queryset.all()` |

| SELECT name | `db.Select("name")` | `q.Person.Select(q.Person.Name)` | `queryset.values("name")` |

| WHERE name = 'Joe' | `db.Where("name=?","Joe")` | `q.Person.Where( q.Person.Name.Eq("Joe"))` | `queryset.filter(name="Joe")` |

| LIMIT | `.Limit(10)` | `q.Person.Limit(10)` | `qs[:10]` |

---

## Repository pattern

---

## Active record vs. Data mapper

---

## Resources