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A Query Mapper for Python

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# SQLSpec

**Type-safe SQL execution for Python, without an ORM.**

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</div>

SQLSpec is a SQL execution layer for Python. You write the SQL -- as strings, through a builder API, or loaded from files. SQLSpec handles connections, parameter binding, and dialect translation. It maps results back to typed Python objects. It uses [sqlglot](https://github.com/tobymao/sqlglot) under the hood. Queries are parsed, validated, and optimized before they hit the database.

| Area | Support |
| --- | --- |
| **One API** | The same session and result APIs with sync or async drivers. |
| **Databases** | PostgreSQL, SQLite, DuckDB, MySQL, SQL Server, Oracle, CockroachDB, BigQuery, Spanner, and supported Arrow Database Connectivity backends such as Snowflake, Flight SQL, and GizmoSQL. |
| **Data tools** | Typed result mapping, Arrow export, built-in storage, and native bulk ingest where the adapter supports it. |
| **Frameworks** | Litestar, FastAPI, Flask, Sanic, and Starlette. |

## Quick Start

```bash
pip install sqlspec
```

```python
from dataclasses import dataclass

from sqlspec import SQLSpec
from sqlspec.adapters.sqlite import SqliteConfig

@dataclass
class Greeting:
    message: str

spec = SQLSpec()
db = spec.add_config(SqliteConfig(connection_config={"database": ":memory:"}))

with spec.provide_session(db) as session:
    greeting = session.select_one("SELECT 'Hello, SQLSpec!' AS message", schema_type=Greeting)
    print(greeting.message)  # Output: Hello, SQLSpec!
```

Write SQL, define a schema, get typed objects back. The [getting started guide](https://sqlspec.dev/getting_started/) covers adapter installation and the query builder.

## Features

- **Session lifecycle** -- sync and async sessions with pooling where the adapter supports it
- **Parameter binding and dialect translation** -- powered by sqlglot, with a fluent query builder and `.sql` file loader
- **Result mapping** -- map rows to Pydantic, msgspec, attrs, or dataclass models, or export to Arrow tables for pandas and Polars
- **Storage layer** -- read and write Arrow tables to local files, fsspec, or object stores
- **Framework integrations** -- Litestar plugin with DI, Starlette/FastAPI/Sanic middleware, Flask extension
- **Google ADK** -- SQLSpec-backed session, event, memory, and artifact services
- **Observability** -- OpenTelemetry and Prometheus instrumentation, structured logging with correlation IDs
- **Event channels** -- LISTEN/NOTIFY, Oracle AQ/TxEventQ, and durable table-backed queues with polling fallback
- **Migrations** -- native schema migration CLI backed by SQLSpec's SQL file loader

## Documentation

- [Getting Started](https://sqlspec.dev/getting_started/) -- installation, adapter selection, first steps
- [Usage Guides](https://sqlspec.dev/usage/) -- adapters, configuration, SQL file loader, and more
- [Examples Gallery](https://sqlspec.dev/examples/) -- working code for common patterns
- [API Reference](https://sqlspec.dev/reference/) -- full API docs
- [CLI Reference](https://sqlspec.dev/usage/cli.html) -- migration and management commands

## Playground

Want to try it without installing anything? The [interactive playground](https://sqlspec.dev/playground) runs SQLSpec in your browser with a sandboxed Python runtime.

## Reference Applications

- **[PostgreSQL + Vertex AI Demo](https://github.com/cofin/postgres-vertexai-demo)** -- Vector search with pgvector and real-time chat using Litestar and Google ADK. Shows connection pooling, migrations, type-safe result mapping, vector embeddings, and response caching.
- **[Oracle + Vertex AI Demo](https://github.com/cofin/oracledb-vertexai-demo)** -- Oracle 23ai vector search with semantic similarity using HNSW indexes. Demonstrates NumPy array conversion, large object handling, and real-time performance metrics.

## Contributing

Contributions are welcome -- whether that's bug reports, new adapter ideas, or pull requests. Take a look at the [contributor guide](https://sqlspec.dev/contributing/) to get started.

## License

MIT

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