![]() ![]() This may be used to provide for additional table options that mayĪ naming convention dictionary of the formĭescribed at Integration of Naming Conventions into Operations, Autogenerate which will be applied When created, in addition to those copied from the source table. Table_kwargs ¶ – a dictionary of additional keyword arguments This may be used to provide additional constraints such as CHECK Table_args ¶ – a sequence of additional positional arguments thatĬreated, in addition to those copied from the source table. Will be reflected, in lieu of passing the whole Used to pass additional table and reflection options to the table that That will be applied to the table structure being copied this may be Reflect_kwargs ¶ – a dictionary of additional keyword arguments Table that will be reflected, in lieu of passing the whole This may be used to pass column and constraint overrides to the Will be applied to the table structure being reflected / copied Reflect_args ¶ – a sequence of additional positional arguments that Operations except that table names and schema names Of BatchOperations this object is the same as The method is used as a context manager, which returns an instance Operation on other backends will proceed using standard ALTER TABLE SQLite backend, and only if directives are present which require The directive by default will only use “recreate” style on the The new table is renamed to the existing table name. The data copied from the existing table to the new table. Migration directives within the batch, using a temporary name. Modes of table migration, in particular the “recreate” style ofĪ new table is created with the new specification, based on the To be syntactically grouped together, and allows for alternate Invoke a series of per-table migrations in batch.īatch mode allows a series of operations specific to a table batch_alter_table ( table_name : str, schema : str | None = None, recreate : Literal = 'auto', partial_reordering : tuple | None = None, copy_from : Table | None = None, table_args : Tuple = (), table_kwargs : Mapping =, naming_convention : Dict | None = None ) → Iterator ¶ AbstractOperations ( migration_context : MigrationContext, impl : BatchOperationsImpl | None = None ) ¶īase class for Operations and BatchOperations. Itself would be invoked by the n_migrations() ![]() Under normalĬircumstances they are called from an actual migration script, which The functions here all require that a MigrationContext has beenĬonfigured within the env.py script first, which is typically Objects, though the table metadata is still generated here. Rule include the add_column() and create_table() Given in terms of just the string names and/or flags involved. This so that migration instructions can be To the greatest degree possible, they internally generate theĪppropriate SQLAlchemy metadata, typically involving SeeĪ key design philosophy to the Operation Directives methods is that The Operations system is also fully extensible. So symbols can be imported safely from the alembic.op namespace. With individual proxies for each method on Operations, To the script via the alembic.op datamember, which isĪ proxy to an actual instance of Operations.Ĭurrently, alembic.op is a real Python module, populated When migration scripts are run, this object is made available Within the upgrade() and downgrade() functions, as well asĪll directives exist as methods on a class called Operations. The directives here are used within user-defined migration files, This file provides documentation on Alembic migration directives. ![]()
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