class PGVectorSQLQueryEngine(BaseSQLTableQueryEngine):
"""
PGvector SQL query engine.
A modified version of the normal text-to-SQL query engine because
we can infer embedding vectors in the sql query.
NOTE: this is a beta feature
NOTE: Any Text-to-SQL application should be aware that executing
arbitrary SQL queries can be a security risk. It is recommended to
take precautions as needed, such as using restricted roles, read-only
databases, sandboxing, etc.
"""
def __init__(
self,
sql_database: SQLDatabase,
llm: Optional[LLM] = None,
text_to_sql_prompt: Optional[BasePromptTemplate] = None,
context_query_kwargs: Optional[dict] = None,
synthesize_response: bool = True,
response_synthesis_prompt: Optional[BasePromptTemplate] = None,
refine_synthesis_prompt: Optional[BasePromptTemplate] = None,
tables: Optional[Union[List[str], List[Table]]] = None,
context_str_prefix: Optional[str] = None,
sql_only: bool = False,
callback_manager: Optional[CallbackManager] = None,
**kwargs: Any,
) -> None:
"""Initialize params."""
text_to_sql_prompt = text_to_sql_prompt or DEFAULT_TEXT_TO_SQL_PGVECTOR_PROMPT
self._sql_retriever = NLSQLRetriever(
sql_database,
llm=llm,
text_to_sql_prompt=text_to_sql_prompt,
context_query_kwargs=context_query_kwargs,
tables=tables,
sql_parser_mode=SQLParserMode.PGVECTOR,
context_str_prefix=context_str_prefix,
sql_only=sql_only,
callback_manager=callback_manager,
)
super().__init__(
synthesize_response=synthesize_response,
response_synthesis_prompt=response_synthesis_prompt,
refine_synthesis_prompt=refine_synthesis_prompt,
llm=llm,
callback_manager=callback_manager,
**kwargs,
)
@property
def sql_retriever(self) -> NLSQLRetriever:
"""Get SQL retriever."""
return self._sql_retriever
