Picture by Creator# Introduction
Knowledge has change into an indispensable useful resource for any profitable enterprise, because it offers beneficial insights for knowledgeable decision-making. Given the significance of information, many firms are constructing techniques to retailer and analyze it. Nevertheless, there are various occasions when it’s laborious to accumulate and analyze the required information, particularly with the growing complexity of the information system.
With the arrival of generative AI, information work has change into considerably simpler, as we are able to now use easy pure language to obtain principally correct output that intently follows the enter we offer. It’s additionally relevant to information processing and evaluation with SQL, the place we are able to ask for question improvement.
On this article, we are going to develop a easy API software that interprets pure language into SQL queries that our database understands. We are going to use three principal instruments: OpenAI, FastAPI, and SQLite.
Right here’s the plan.
# Textual content-to-SQL App Growth
First, we’ll put together all the things wanted for our mission. All it is advisable present is the OpenAI API key, which we’ll use to entry the generative mannequin. To containerize the appliance, we are going to use Docker, which you’ll purchase for the native implementation utilizing Docker Desktop.
Different elements, similar to SQLite, will already be accessible once you set up Python, and FastAPI will likely be put in later.
For the general mission construction, we are going to use the next:
text_to_sql_app/
├── app/
│ ├── __init__.py
│ ├── database.py
│ ├── openai_utils.py
│ └── principal.py
├── demo.db
├── init_db.sql
├── necessities.txt
├── Dockerfile
├── docker-compose.yml
├── .env
Create the construction like above, or you need to use the next repository to make issues simpler. We are going to nonetheless undergo every file to realize an understanding of how you can develop the appliance.
Let’s begin by populating the .env file with the OpenAI API key we beforehand acquired. You are able to do that with the next code:
OPENAI_API_KEY=YOUR-API-KEY
Then, go to the necessities.txt to fill within the crucial libraries we are going to use for
fastapi
uvicorn
sqlalchemy
openai
pydantic
python-dotenv
Subsequent, we transfer on to the __init__.py file, and we are going to put the next code inside:
from pathlib import Path
from dotenv import load_dotenv
load_dotenv(dotenv_path=Path(__file__).resolve().father or mother.father or mother / ".env", override=False)
The code above ensures that the atmosphere comprises all the required keys we want.
Then, we are going to develop Python code within the database.py file to connect with the SQLite database we are going to create later (referred to asdemo.db) and supply a solution to run SQL queries.
from sqlalchemy import create_engine, textual content
from sqlalchemy.orm import Session
ENGINE = create_engine("sqlite:///demo.db", future=True, echo=False)
def run_query(sql: str) -> listing[dict]:
with Session(ENGINE) as session:
rows = session.execute(textual content(sql)).mappings().all()
return [dict(r) for r in rows]
After that, we are going to put together the openai_utils.py file that can settle for the database schema and the enter questions. The output will likely be JSON containing the SQL question (with a guard to stop any write operations).
import os
import json
from openai import OpenAI
shopper = OpenAI(api_key=os.getenv("OPENAI_API_KEY"))
_SYSTEM_PROMPT = """
You change natural-language questions into read-only SQLite SQL.
By no means output INSERT / UPDATE / DELETE.
Return JSON: { "sql": "..." }.
"""
def text_to_sql(query: str, schema: str) -> str:
response = shopper.chat.completions.create(
mannequin="gpt-4o-mini",
temperature=0.1,
response_format={"kind": "json_object"},
messages=[
{"role": "system", "content": _SYSTEM_PROMPT},
{"role": "user",
"content": f"schema:n{schema}nnquestion: {question}"}
]
)
payload = json.hundreds(response.selections[0].message.content material)
return payload["sql"]
With each the code and the connection prepared, we are going to put together the appliance utilizing FastAPI. The applying will settle for pure language questions and the database schema, convert them into SQL SELECT queries, run them by means of the SQLite database, and return the outcomes as JSON. The applying will likely be an API we are able to entry by way of the CLI.
from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from sqlalchemy import examine
from .database import ENGINE, run_query
from .openai_utils import text_to_sql
app = FastAPI(title="Textual content-to-SQL Demo")
class NLRequest(BaseModel):
query: str
@app.on_event("startup")
def capture_schema() -> None:
insp = examine(ENGINE)
international SCHEMA_STR
SCHEMA_STR = "n".be part of(
f"CREATE TABLE {t} ({', '.be part of(c['name'] for c in insp.get_columns(t))});"
for t in insp.get_table_names()
)
@app.submit("/question")
def question(req: NLRequest):
attempt:
sql = text_to_sql(req.query, SCHEMA_STR)
if not sql.lstrip().decrease().startswith("choose"):
increase ValueError("Solely SELECT statements are allowed")
return {"sql": sql, "consequence": run_query(sql)}
besides Exception as e:
increase HTTPException(status_code=400, element=str(e))
That’s all the things we want for the primary software. The subsequent factor we are going to put together is the database. Use the database under within the init_db.sql for instance functions, however you may at all times change it if you’d like.
DROP TABLE IF EXISTS order_items;
DROP TABLE IF EXISTS orders;
DROP TABLE IF EXISTS funds;
DROP TABLE IF EXISTS merchandise;
DROP TABLE IF EXISTS prospects;
CREATE TABLE prospects (
id INTEGER PRIMARY KEY,
title TEXT NOT NULL,
nation TEXT,
signup_date DATE
);
CREATE TABLE merchandise (
id INTEGER PRIMARY KEY,
title TEXT NOT NULL,
class TEXT,
value REAL
);
CREATE TABLE orders (
id INTEGER PRIMARY KEY,
customer_id INTEGER,
order_date DATE,
complete REAL,
FOREIGN KEY (customer_id) REFERENCES prospects(id)
);
CREATE TABLE order_items (
order_id INTEGER,
product_id INTEGER,
amount INTEGER,
unit_price REAL,
PRIMARY KEY (order_id, product_id),
FOREIGN KEY (order_id) REFERENCES orders(id),
FOREIGN KEY (product_id) REFERENCES merchandise(id)
);
CREATE TABLE funds (
id INTEGER PRIMARY KEY,
order_id INTEGER,
payment_date DATE,
quantity REAL,
methodology TEXT,
FOREIGN KEY (order_id) REFERENCES orders(id)
);
INSERT INTO prospects (id, title, nation, signup_date) VALUES
(1,'Alice','USA','2024-01-05'),
(2,'Bob','UK','2024-03-10'),
(3,'Choi','KR','2024-06-22'),
(4,'Dara','ID','2025-01-15');
INSERT INTO merchandise (id, title, class, value) VALUES
(1,'Laptop computer Professional','Electronics',1500.00),
(2,'Noise-Canceling Headphones','Electronics',300.00),
(3,'Standing Desk','Furnishings',450.00),
(4,'Ergonomic Chair','Furnishings',250.00),
(5,'Monitor 27"','Electronics',350.00);
INSERT INTO orders (id, customer_id, order_date, complete) VALUES
(1,1,'2025-02-01',1850.00),
(2,2,'2025-02-03',600.00),
(3,3,'2025-02-05',350.00),
(4,1,'2025-02-07',450.00);
INSERT INTO order_items (order_id, product_id, amount, unit_price) VALUES
(1,1,1,1500.00),
(1,2,1,300.00),
(1,5,1,350.00),
(2,3,1,450.00),
(2,4,1,250.00),
(3,5,1,350.00),
(4,3,1,450.00);
INSERT INTO funds (id, order_id, payment_date, quantity, methodology) VALUES
(1,1,'2025-02-01',1850.00,'Credit score Card'),
(2,2,'2025-02-03',600.00,'PayPal'),
(3,3,'2025-02-05',350.00,'Credit score Card'),
(4,4,'2025-02-07',450.00,'Financial institution Switch');
Then, run the next code in your CLI to create a SQLite database for our mission.
sqlite3 demo.db < init_db.sql
With the database prepared, we are going to create a Dockerfile to containerize our software.
FROM python:3.12-slim
WORKDIR /code
COPY necessities.txt .
RUN pip set up --no-cache-dir -r necessities.txt
COPY . .
CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]
We can even create a docker-compose.yml file for working the appliance extra easily.
providers:
text2sql:
construct: .
env_file: .env
ports:
- "8000:8000"
restart: unless-stopped
volumes:
- ./demo.db:/code/demo.db
With all the things prepared, begin your Docker Desktop and run the next code to construct the appliance.
docker compose construct --no-cache
docker compose up -d
If all the things is completed nicely, you may take a look at the appliance by utilizing the next code. We are going to ask what number of prospects now we have within the information.
curl -X POST "http://localhost:8000/question" -H "Content material-Sort: software/json" -d "{"query":"What number of prospects?"}"
The output will appear to be this.
{"sql":"SELECT COUNT(*) AS customer_count FROM prospects;","consequence":[{"customer_count":4}]}
We are able to attempt one thing extra complicated, just like the variety of orders for every buyer:
curl -X POST "http://localhost:8000/question" -H "Content material-Sort: software/json" -d "{"query":"What's the variety of orders positioned by every buyer"}"
With output like under.
{"sql":"SELECT customer_id, COUNT(*) AS number_of_orders FROM orders GROUP BY customer_id;","consequence":[{"customer_id":1,"number_of_orders":2},{"customer_id":2,"number_of_orders":1},{"customer_id":3,"number_of_orders":1}]}
That’s all it is advisable construct a fundamental Textual content-to-SQL software. You may improve it additional with a front-end interface and a extra complicated system tailor-made to your wants.
# Wrapping Up
Knowledge is the center of any information work, and corporations use it to make choices. Many occasions, the system now we have is just too complicated, and we have to depend on generative AI to assist us navigate it.
On this article, now we have discovered how you can develop a easy Textual content-to-SQL software utilizing the OpenAI mannequin, FastAPI, and SQLite.
I hope this has helped!
Cornellius Yudha Wijaya is a knowledge science assistant supervisor and information author. Whereas working full-time at Allianz Indonesia, he likes to share Python and information suggestions by way of social media and writing media. Cornellius writes on a wide range of AI and machine studying subjects.
