AstraDBBaseStore#

class langchain_community.storage.astradb.AstraDBBaseStore(*args: Any, **kwargs: Any)[source]#

Base class for the DataStax AstraDB data store.

Methods

`__init__`(args, *kwargs)
`amdelete`(keys)	Async delete the given keys and their associated values.
`amget`(keys)	Async get the values associated with the given keys.
`amset`(key_value_pairs)	Async set the values for the given keys.
`ayield_keys`(*[, prefix])	Async get an iterator over keys that match the given prefix.
`decode_value`(value)	Decodes value from Astra DB
`encode_value`(value)	Encodes value for Astra DB
`mdelete`(keys)	Delete the given keys and their associated values.
`mget`(keys)	Get the values associated with the given keys.
`mset`(key_value_pairs)	Set the values for the given keys.
`yield_keys`(*[, prefix])	Get an iterator over keys that match the given prefix.

Parameters:

__init__(

*args: Any,

**kwargs: Any,

) → None[source]#

Parameters:

Return type:

None

async amdelete( keys: Sequence[str], ) → None[source]#

Async delete the given keys and their associated values.

async amget( keys: Sequence[str], ) → List[V | None][source]#

Async get the values associated with the given keys.

Parameters:: keys (Sequence[K]) – A sequence of keys.
Returns:: A sequence of optional values associated with the keys. If a key is not found, the corresponding value will be None.
Return type:: List[V | None]

async amset( key_value_pairs: Sequence[Tuple[str, V]], ) → None[source]#

Async set the values for the given keys.

Parameters:: key_value_pairs (Sequence[tuple[K, V]]) – A sequence of key-value pairs.
Return type:: None

async ayield_keys( *, prefix: str | None = None, ) → AsyncIterator[str][source]#

Async get an iterator over keys that match the given prefix.

Parameters:: prefix (str) – The prefix to match.
Yields:: Iterator[K | str] – An iterator over keys that match the given prefix. This method is allowed to return an iterator over either K or str depending on what makes more sense for the given store.
Return type:: AsyncIterator[str]

abstractmethod decode_value( value: Any, ) → V | None[source]#

Decodes value from Astra DB

abstractmethod encode_value( value: V | None, ) → Any[source]#

Encodes value for Astra DB

mdelete( keys: Sequence[str], ) → None[source]#

Delete the given keys and their associated values.

mget( keys: Sequence[str], ) → List[V | None][source]#

Get the values associated with the given keys.

Parameters:: keys (Sequence[K]) – A sequence of keys.
Returns:: A sequence of optional values associated with the keys. If a key is not found, the corresponding value will be None.
Return type:: List[V | None]

mset( key_value_pairs: Sequence[Tuple[str, V]], ) → None[source]#

Set the values for the given keys.

Parameters:: key_value_pairs (Sequence[tuple[K, V]]) – A sequence of key-value pairs.
Return type:: None

yield_keys( *, prefix: str | None = None, ) → Iterator[str][source]#

Get an iterator over keys that match the given prefix.

Parameters:: prefix (str) – The prefix to match.
Yields:: Iterator[K | str] – An iterator over keys that match the given prefix. This method is allowed to return an iterator over either K or str depending on what makes more sense for the given store.
Return type:: Iterator[str]