sqlalchemy.ext.horizontal_shard

module documentation
(source)

Horizontal sharding support. Defines a rudimental 'horizontal sharding' system which allows a Session to distribute queries and persistence operations across multiple databases. For a usage example, see the :ref:`examples_sharding` example included in the source distribution. .. deepalchemy:: The horizontal sharding extension is an advanced feature, involving a complex statement -> database interaction as well as use of semi-public APIs for non-trivial cases. Simpler approaches to refering to multiple database "shards", most commonly using a distinct :class:`_orm.Session` per "shard", should always be considered first before using this more complex and less-production-tested system.

Class IdentityChooser Undocumented
Class set_shard_id a loader option for statements to apply a specific shard id to the primary query as well as for additional relationship and column loaders.
Class ShardChooser Undocumented
Class ShardedQuery Query class used with :class:`.ShardedSession`.
Class ShardedSession No class docstring; 0/4 instance variable, 3/6 methods documented
Function execute_and_instances Undocumented
Type Variable _T Undocumented
def execute_and_instances(orm_context: ORMExecuteState) -> Union[Result[_T], IteratorResult[_TP]]: (source)

Undocumented

_T = (source)

Undocumented

Value
TypeVar('_T',
        bound=Any)