exists() — langchain Function Reference

Architecture documentation for the exists() function in _sql_record_manager.py from the langchain codebase.

Function python LangChainCore ApiManagement calls 1

Entity Profile

LangChainCore→ ApiManagement→ exists() — langchain Function Reference

Dependency Diagram

graph TD
  7cdc3154_7921_569d_0792_e88c88c2da9a["exists()"]
  9d7938c1_1c25_4cae_be80_9fc00a5ed077["SQLRecordManager"]
  7cdc3154_7921_569d_0792_e88c88c2da9a -->|defined in| 9d7938c1_1c25_4cae_be80_9fc00a5ed077
  82b22123_4423_ea4d_765a_075b780b8c2e["_make_session()"]
  7cdc3154_7921_569d_0792_e88c88c2da9a -->|calls| 82b22123_4423_ea4d_765a_075b780b8c2e
  style 7cdc3154_7921_569d_0792_e88c88c2da9a fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain/langchain_classic/indexes/_sql_record_manager.py lines 417–429

    def exists(self, keys: Sequence[str]) -> list[bool]:
        """Check if the given keys exist in the SQLite database."""
        session: Session
        with self._make_session() as session:
            filtered_query: Query = session.query(UpsertionRecord.key).filter(
                and_(
                    UpsertionRecord.key.in_(keys),
                    UpsertionRecord.namespace == self.namespace,
                ),
            )
            records = filtered_query.all()
        found_keys = {r.key for r in records}
        return [k in found_keys for k in keys]