SQLiteCache#

class langchain_community.cache.SQLiteCache(database_path: str = '.langchain.db')[source]#

Cache that uses SQLite as a backend.

Initialize by creating the engine and all tables.

Methods

`__init__`([database_path])	Initialize by creating the engine and all tables.
`aclear`(**kwargs)	Async clear cache that can take additional keyword arguments.
`alookup`(prompt, llm_string)	Async look up based on prompt and llm_string.
`aupdate`(prompt, llm_string, return_val)	Async update cache based on prompt and llm_string.
`clear`(**kwargs)	Clear cache.
`lookup`(prompt, llm_string)	Look up based on prompt and llm_string.
`update`(prompt, llm_string, return_val)	Update based on prompt and llm_string.

__init__(database_path: str = '.langchain.db')[source]#

Initialize by creating the engine and all tables.

async aclear(**kwargs: Any) → None#

Async clear cache that can take additional keyword arguments.

async alookup(prompt: str, llm_string: str) → Sequence[Generation] | None#

Async look up based on prompt and llm_string.

A cache implementation is expected to generate a key from the 2-tuple of prompt and llm_string (e.g., by concatenating them with a delimiter).

Parameters:

prompt (str) – a string representation of the prompt. In the case of a Chat model, the prompt is a non-trivial serialization of the prompt into the language model.
llm_string (str) – A string representation of the LLM configuration. This is used to capture the invocation parameters of the LLM (e.g., model name, temperature, stop tokens, max tokens, etc.). These invocation parameters are serialized into a string representation.

Returns:

On a cache miss, return None. On a cache hit, return the cached value. The cached value is a list of Generations (or subclasses).

Return type:

Sequence[Generation] | None

async aupdate(prompt: str, llm_string: str, return_val: Sequence[Generation]) → None#

Async update cache based on prompt and llm_string.

The prompt and llm_string are used to generate a key for the cache. The key should match that of the look up method.

Parameters:

prompt (str) – a string representation of the prompt. In the case of a Chat model, the prompt is a non-trivial serialization of the prompt into the language model.
llm_string (str) – A string representation of the LLM configuration. This is used to capture the invocation parameters of the LLM (e.g., model name, temperature, stop tokens, max tokens, etc.). These invocation parameters are serialized into a string representation.
return_val (Sequence[Generation]) – The value to be cached. The value is a list of Generations (or subclasses).

Return type:

None

clear(**kwargs: Any) → None#

Clear cache.

lookup(prompt: str, llm_string: str) → Sequence[Generation] | None#

Look up based on prompt and llm_string.

Parameters:

Return type:

Sequence[Generation] | None

update(prompt: str, llm_string: str, return_val: Sequence[Generation]) → None#

Update based on prompt and llm_string.

Parameters:

Return type:

None

Examples using SQLiteCache