What are some examples of Alembic commands?
An example of an AI chatbot conversation about Alembic commands and their usage.
What are some examples of Alembic commands?
Alembic is a database migration tool for SQLAlchemy. Here are some common commands:
alembic init <directory>- Initializes a new Alembic environment.alembic revision -m "message"- Creates a new migration script with a message.alembic upgrade <revision>- Applies migrations up to a specific revision.alembic downgrade <revision>- Reverts migrations to a specific revision.
Can you explain what a migration script is?
A migration script is a Python file generated by Alembic that contains instructions for upgrading or downgrading the database schema. It includes operations like adding or removing tables, columns, or constraints.
How do I apply a migration?
To apply a migration, you use the command alembic upgrade <revision>, where <revision> is the identifier of the migration you want to apply. If you want to apply all pending migrations, you can simply use alembic upgrade head.
What if I want to revert a migration?
To revert a migration, you can use the command alembic downgrade <revision>, where <revision> is the identifier of the migration you want to revert to. You can also use alembic downgrade -1 to revert the last migration.
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