`langchain_community.indexes.base`.RecordManager¶

class langchain_community.indexes.base.RecordManager(namespace: str)[source]¶

Abstract base class for a record manager.

Initialize the record manager.

Parameters: namespace (str) – The namespace for the record manager.

Methods

`__init__`(namespace)	Initialize the record manager.
`acreate_schema`()	Create the database schema for the record manager.
`adelete_keys`(keys)	Delete specified records from the database.
`aexists`(keys)	Check if the provided keys exist in the database.
`aget_time`()	Get the current server time as a high resolution timestamp!
`alist_keys`(*[, before, after, group_ids, limit])	List records in the database based on the provided filters.
`aupdate`(keys, *[, group_ids, time_at_least])	Upsert records into the database.
`create_schema`()	Create the database schema for the record manager.
`delete_keys`(keys)	Delete specified records from the database.
`exists`(keys)	Check if the provided keys exist in the database.
`get_time`()	Get the current server time as a high resolution timestamp!
`list_keys`(*[, before, after, group_ids, limit])	List records in the database based on the provided filters.
`update`(keys, *[, group_ids, time_at_least])	Upsert records into the database.

__init__(namespace: str) → None[source]¶

Initialize the record manager.

Parameters: namespace (str) – The namespace for the record manager.
Return type: None

abstract async acreate_schema() → None[source]¶

Create the database schema for the record manager.

Return type: None

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

Delete specified records from the database.

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

abstract async aexists(keys: Sequence[str]) → List[bool][source]¶

Check if the provided keys exist in the database.

Parameters: keys (Sequence[str]) – A list of keys to check.
Returns: A list of boolean values indicating the existence of each key.
Return type: List[bool]

abstract async aget_time() → float[source]¶

Get the current server time as a high resolution timestamp!

It’s important to get this from the server to ensure a monotonic clock, otherwise there may be data loss when cleaning up old documents!

Returns: The current server time as a float timestamp.
Return type: float

abstract async alist_keys(*, before: Optional[float] = None, after: Optional[float] = None, group_ids: Optional[Sequence[str]] = None, limit: Optional[int] = None) → List[str][source]¶

List records in the database based on the provided filters.

Parameters

before (Optional[float]) – Filter to list records updated before this time.
after (Optional[float]) – Filter to list records updated after this time.
group_ids (Optional[Sequence[str]]) – Filter to list records with specific group IDs.
limit (Optional[int]) – optional limit on the number of records to return.

Returns

A list of keys for the matching records.

Return type

List[str]

abstract async aupdate(keys: Sequence[str], *, group_ids: Optional[Sequence[Optional[str]]] = None, time_at_least: Optional[float] = None) → None[source]¶

Upsert records into the database.

Parameters

keys (Sequence[str]) – A list of record keys to upsert.
group_ids (Optional[Sequence[Optional[str]]]) – A list of group IDs corresponding to the keys.
time_at_least (Optional[float]) – if provided, updates should only happen if the updated_at field is at least this time.

Raises

ValueError – If the length of keys doesn’t match the length of group_ids.

Return type

None

abstract create_schema() → None[source]¶

Create the database schema for the record manager.

Return type: None

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

Delete specified records from the database.

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

abstract exists(keys: Sequence[str]) → List[bool][source]¶

Check if the provided keys exist in the database.

Parameters: keys (Sequence[str]) – A list of keys to check.
Returns: A list of boolean values indicating the existence of each key.
Return type: List[bool]

abstract get_time() → float[source]¶

Get the current server time as a high resolution timestamp!

It’s important to get this from the server to ensure a monotonic clock, otherwise there may be data loss when cleaning up old documents!

Returns: The current server time as a float timestamp.
Return type: float

abstract list_keys(*, before: Optional[float] = None, after: Optional[float] = None, group_ids: Optional[Sequence[str]] = None, limit: Optional[int] = None) → List[str][source]¶

List records in the database based on the provided filters.

Parameters

before (Optional[float]) – Filter to list records updated before this time.
after (Optional[float]) – Filter to list records updated after this time.
group_ids (Optional[Sequence[str]]) – Filter to list records with specific group IDs.
limit (Optional[int]) – optional limit on the number of records to return.

Returns

A list of keys for the matching records.

Return type

List[str]

abstract update(keys: Sequence[str], *, group_ids: Optional[Sequence[Optional[str]]] = None, time_at_least: Optional[float] = None) → None[source]¶

Upsert records into the database.

Parameters

keys (Sequence[str]) – A list of record keys to upsert.
group_ids (Optional[Sequence[Optional[str]]]) – A list of group IDs corresponding to the keys.
time_at_least (Optional[float]) – if provided, updates should only happen if the updated_at field is at least this time.

Raises

ValueError – If the length of keys doesn’t match the length of group_ids.

Return type

None

langchain_community.indexes.base.RecordManager¶

`langchain_community.indexes.base`.RecordManager¶