Agente Text-to-SQL con LangChain

from langchain_openai import ChatOpenAI
from langchain_core.tools import tool
from langchain_community.utilities import SQLDatabase
from langchain_community.agent_toolkits import SQLDatabaseToolkit

db = SQLDatabase.from_uri("sqlite:///sales.db", sample_rows_in_table_info=3)
toolkit = SQLDatabaseToolkit(db=db, llm=model)
sql_tools = toolkit.get_tools()

model = ChatOpenAI(model="gpt-4o")
model_with_tools = model.bind_tools([sql_tools])
response = model_with_tools.invoke([
    ("system", "You are a SQL analyst. Convert natural language questions into SQL queries. Only use SELECT statements. Limit results to 10 rows."),
    ("user", "Show me top 5 customers by total spending this quarter"),
])