Class PostgresChatMessageHistory (0.14.1) 

PostgresChatMessageHistory(
    key: object,
    engine: langchain_google_cloud_sql_pg.engine.PostgresEngine,
    history: langchain_google_cloud_sql_pg.async_chat_message_history.AsyncPostgresChatMessageHistory,
)

Chat message history stored in an Cloud SQL for PostgreSQL database.

Properties

messages

Fetches all messages stored in AlloyDB.

Methods

PostgresChatMessageHistory

PostgresChatMessageHistory(
    key: object,
    engine: langchain_google_cloud_sql_pg.engine.PostgresEngine,
    history: langchain_google_cloud_sql_pg.async_chat_message_history.AsyncPostgresChatMessageHistory,
)

PostgresChatMessageHistory constructor.

Parameters
Name Description
key object

Key to prevent direct constructor usage.
engine PostgresEngine

Database connection pool.
history AsyncPostgresChatMessageHistory

Native async implementation
Exceptions
Type Description
Exception If constructor is directly called by the user.

aadd_message

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

Append the message to the record in PostgreSQL

aadd_messages

aadd_messages(
    messages: typing.Sequence[langchain_core.messages.base.BaseMessage],
) -> None

Append a list of messages to the record in PostgreSQL

aclear

aclear() -> None

Clear session memory from PostgreSQL

add_message

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

Append the message to the record in PostgreSQL

add_messages

add_messages(
    messages: typing.Sequence[langchain_core.messages.base.BaseMessage],
) -> None

Append a list of messages to the record in PostgreSQL

clear

clear() -> None

Clear session memory from PostgreSQL

create

create(
    engine: langchain_google_cloud_sql_pg.engine.PostgresEngine,
    session_id: str,
    table_name: str,
    schema_name: str = "public",
) -> langchain_google_cloud_sql_pg.chat_message_history.PostgresChatMessageHistory

Create a new PostgresChatMessageHistory instance.

Parameters
Name Description
engine PostgresEngine

Postgres engine to use.
session_id str

Retrieve the table content with this session ID.
table_name str

Table name that stores the chat message history.
schema_name str, optional

Schema name for the chat message history table. Defaults to "public".
Exceptions
Type Description
IndexError If the table provided does not contain required schema.
Returns
Type Description
PostgresChatMessageHistory A newly created instance of PostgresChatMessageHistory.

create_sync

create_sync(
    engine: langchain_google_cloud_sql_pg.engine.PostgresEngine,
    session_id: str,
    table_name: str,
    schema_name: str = "public",
) -> langchain_google_cloud_sql_pg.chat_message_history.PostgresChatMessageHistory

Create a new PostgresChatMessageHistory instance.

Parameters
Name Description
engine PostgresEngine

Postgres engine to use.
session_id str

Retrieve the table content with this session ID.
table_name str

Table name that stores the chat message history.
schema_name str, optional

Database schema name for the chat message history table. Defaults to "public".
Exceptions
Type Description
IndexError If the table provided does not contain required schema.
Returns
Type Description
PostgresChatMessageHistory A newly created instance of PostgresChatMessageHistory.