`langchain_community.storage.astradb`.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)	Delete the given keys and their associated values.
`amget`(keys)	Get the values associated with the given keys.
`amset`(key_value_pairs)	Set the values for the given keys.
`ayield_keys`(*[, prefix])	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

args (Any) –
kwargs (Any) –

__init__(*args: Any, **kwargs: Any) → None[source]¶

Parameters

args (Any) –
kwargs (Any) –

Return type

None

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

Delete the given keys and their associated values.

Parameters: keys (Sequence[K]) – A sequence of keys to delete.
Return type: None

async amget(keys: Sequence[str]) → List[Optional[V]][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[Optional[V]]

async amset(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

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

Get an iterator over keys that match the given prefix.

Parameters

prefix (str) – The prefix to match.

Returns

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[K | str]

abstract decode_value(value: Any) → Optional[V][source]¶

Decodes value from Astra DB

Parameters: value (Any) –
Return type: Optional[V]

abstract encode_value(value: Optional[V]) → Any[source]¶

Encodes value for Astra DB

Parameters: value (Optional[V]) –
Return type: Any

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

Delete the given keys and their associated values.

Parameters: keys (Sequence[K]) – A sequence of keys to delete.
Return type: None

mget(keys: Sequence[str]) → List[Optional[V]][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[Optional[V]]

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: Optional[str] = None) → Iterator[str][source]¶

Get an iterator over keys that match the given prefix.

Parameters

prefix (str) – The prefix to match.

Returns

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[K | str]

langchain_community.storage.astradb.AstraDBBaseStore¶

`langchain_community.storage.astradb`.AstraDBBaseStore¶