Class SpannerChatMessageHistory (0.5.0)

SpannerChatMessageHistory(
    instance_id: str,
    database_id: str,
    session_id: str,
    table_name: str,
    client: typing.Optional[google.cloud.spanner_v1.client.Client] = None,
)

Chat message history that stores history in Spanner.

Properties

messages

Retrieve the messages from Cloud Spanner

Methods

_verify_schema

_verify_schema() -> None

Verify table exists with required schema for SpannerChatMessageHistory class. Use helper method MSSQLEngine.create_chat_history_table(...) to create table with valid schema.

add_message

add_message(message: langchain_core.messages.base.BaseMessage) -> None

Append the message to the record in Cloud Spanner

clear

clear() -> None

Clear session memory from Cloud Spanner

create_chat_history_table

create_chat_history_table(
    instance_id: str,
    database_id: str,
    table_name: str,
    client: typing.Optional[google.cloud.spanner_v1.client.Client] = None,
) -> None

Create a chat history table in a Cloud Spanner database.

Parameters
Name	Description
`instance_id`	`str` The ID of the Cloud Spanner instance.
`database_id`	`str` The ID of the Cloud Spanner database.
`table_name`	`str` The name of the table to be created.
`client`	`spanner.Client, optional` An instance of the Cloud Spanner client. Defaults to None.

Exceptions
Type	Description
`Exception`	If the specified instance or database does not exist.

Returns
Type	Description
`Operation`	The operation to create the table.