What are migrations in Node.js and why are they important?

What are migrations in Node.js and why are they important?

Migrations in Node.js are scripts that help manage changes to the database schema over time. They are important because they allow developers to version control database changes, ensuring consistency across different environments.

How do I create a migration in Node.js?

To create a migration in Node.js, you typically use a migration tool like Sequelize or Knex. You can run a command like sequelize migration:create --name migration_name to generate a new migration file.

Can you explain how to run migrations?

Sure! To run migrations, you would use a command specific to your migration tool. For example, with Sequelize, you would run sequelize db:migrate to apply all pending migrations.

What happens if a migration fails?

If a migration fails, it usually rolls back the changes to maintain database integrity. Most migration tools provide a way to handle errors and revert changes automatically.