rdf-store-postgres 0.3.4

# RDF.rs: PostgreSQL Store

[![License](https://img.shields.io/badge/license-Public%20Domain-blue.svg)](https://unlicense.org)
[![Compatibility](https://img.shields.io/badge/rust-1.85%2B-blue)](https://blog.rust-lang.org/2025/02/20/Rust-1.85.0/)
[![Package](https://img.shields.io/crates/v/rdf-store-postgres)](https://crates.io/crates/rdf-store-postgres)
[![Documentation](https://docs.rs/rdf-store-postgres/badge.svg)](https://docs.rs/rdf-store-postgres)

A [PostgreSQL] storage adapter for **[RDF.rs]** knowledge graphs.

> [!TIP]
> 🚧 _We are building in public. This is presently under heavy construction._

<sub>

[[Features](#-features)] |
[[Prerequisites](#%EF%B8%8F-prerequisites)] |
[[Installation](#%EF%B8%8F-installation)] |
[[Examples](#-examples)] |
[[Reference](#-reference)] |
[[Development](#%E2%80%8D-development)]

</sub>

## ✨ Features

- Implements a scalable, high-performance RDF store backed by [PostgreSQL].
- Built on async Rust using lazily-evaluated streams throughout.
- 100% pure and safe Rust with minimal dependencies and no bloat.
- Supports opting out of any feature using comprehensive [feature flags].
- Adheres to the Rust API Guidelines in its [naming conventions].
- Cuts red tape: 100% free and unencumbered public domain software.

## 🛠️ Prerequisites

- [Rust] 1.85+ (2024 edition)

## ⬇️ Installation

### Installation via Cargo

```bash
cargo add rdf-store-postgres
```

### Installation in `Cargo.toml`

Enable all default features:

```toml
[dependencies]
rdf-store-postgres = { version = "0.3" }
```

Enable only specific features:

```toml
[dependencies]
rdf-store-postgres = { version = "0.3", default-features = false, features = ["tls"] }
```

## 👉 Examples

### Running a PostgreSQL Server

```bash
docker run -p 5432:5432 -e POSTGRES_HOST_AUTH_METHOD=trust postgres
```

### Importing the Library

```rust
use rdf_store_postgres::{PostgresStore, PostgresTransaction};
```

### Connecting to the Store

```rust,compile_fail
let mut store = PostgresStore::open("postgres://").await?;
```

### Mutating the Store

```rust,compile_fail
let mut tx = store.write().await?;

tx.remove(old_quad.into()).await?;
tx.insert(new_quad.into()).await?;

tx.commit().await?; // ...or:
//tx.rollback().await?;
```

### Accessing the Store

```rust,compile_fail
let tx = store.read().await?;

tx.r#match(quad_pattern)
    .for_each(|quad| async move {
        eprintln!("{:?}", quad);
    })
    .await;
```

## 📚 Reference

[docs.rs/rdf-store-postgres](https://docs.rs/rdf-store-postgres)

## 👨‍💻 Development

```bash
git clone https://github.com/rust-rdf/rdf.rs.git
```

---

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[feature flags]: https://github.com/rust-rdf/rdf.rs/blob/master/lib/rdf-store-postgres/Cargo.toml
[naming conventions]: https://rust-lang.github.io/api-guidelines/naming.html

[PostgreSQL]: https://postgresql.org
[RDF]: https://www.w3.org/TR/rdf12-concepts/
[RDF.rs]: https://github.com/rust-rdf/rdf.rs
[Rust]: https://rust-lang.org