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.. _alembic.ddl.toplevel: ============= DDL Internals ============= These are some of the constructs used to generate migration instructions. The APIs here build off of the :class:`sqlalchemy.schema.DDLElement` and :ref:`sqlalchemy.ext.compiler_toplevel` systems. For programmatic usage of Alembic's migration directives, the easiest route is to use the higher level functions given by :ref:`alembic.operations.toplevel`. .. automodule:: alembic.ddl :members: :undoc-members: .. automodule:: alembic.ddl.base :members: :undoc-members: .. automodule:: alembic.ddl.impl :members: :undoc-members: MySQL ============= .. automodule:: alembic.ddl.mysql :members: :undoc-members: :show-inheritance: MS-SQL ============= .. automodule:: alembic.ddl.mssql :members: :undoc-members: :show-inheritance: Postgresql ============= .. automodule:: alembic.ddl.postgresql :members: :undoc-members: :show-inheritance: SQLite ============= .. automodule:: alembic.ddl.sqlite :members: :undoc-members: :show-inheritance: