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SQLAlchemy vs Sequelize: What are the differences?


In this document, we will discuss the key differences between SQLAlchemy and Sequelize, which are both popular ORM tools used for database management. These differences will help you understand the unique features and functionalities offered by each of these tools.

  1. Database Support: SQLAlchemy supports a wide range of database systems including PostgreSQL, MySQL, SQLite, Oracle, and Microsoft SQL Server. On the other hand, Sequelize primarily focuses on supporting the JavaScript ecosystem and is commonly used with databases such as PostgreSQL, MySQL, SQLite, and Microsoft SQL Server.

  2. Language Compatibility: SQLAlchemy is primarily built for Python applications and provides a rich set of features that are specifically designed for Python developers. Sequelize, on the other hand, is a JavaScript ORM tool that is developed for Node.js applications, making it an ideal choice for JavaScript developers.

  3. API Style: SQLAlchemy follows a more traditional object-oriented approach, allowing developers to interact with the database through classes and objects. It provides a powerful querying API, which is useful for complex database operations. Sequelize, on the other hand, follows a promise-based approach and provides a simpler API for database operations, making it easier to work with asynchronous code and handle callbacks.

  4. Model Definition: In SQLAlchemy, the model definition is done using classes, allowing developers to define a schema by extending the base class and defining attributes for each column. Sequelize uses JavaScript objects to define models, making it easier to define relationships between tables and perform data validations using built-in data types.

  5. Migration Support: SQLAlchemy provides a powerful migration framework called Alembic, which allows developers to manage database schema changes and perform database migrations easily. Sequelize, on the other hand, has its own migration tool called "Sequelize CLI," which provides similar functionality for managing database schema changes.

  6. Community and Ecosystem: SQLAlchemy has been around for a longer time and has a larger community and ecosystem compared to Sequelize. This means that there are more resources, plugins, and community support available for SQLAlchemy, making it easier for developers to find solutions and get help when needed. On the other hand, Sequelize has a growing community and is widely used in the JavaScript ecosystem, especially for Node.js applications.

In Summary, SQLAlchemy and Sequelize differ in terms of the databases they support, the programming languages they are compatible with, the API style they follow, the model definition approaches they use, the migration support they provide, and the size of their community and ecosystem. Understanding these differences will help you choose the right ORM tool based on your project's requirements and the programming language you are using.

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Pros of Sequelize
Pros of SQLAlchemy
  • 42
    Good ORM for node.js
  • 31
    Easy setup
  • 21
    Support MySQL & MariaDB, PostgreSQL, MSSQL, Sqlite
  • 14
    Open source
  • 13
  • 12
    Promise Based
  • 4
    Recommend for mongoose users
  • 3
  • 3
    Atrocious documentation, buggy, issues closed by bots
  • 7
    Open Source

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Cons of Sequelize
Cons of SQLAlchemy
  • 30
    Docs are awful
  • 10
    Relations can be confusing
  • 2

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