Rust Query Builder Core

Core functionality for rust-queries-builder - a powerful, type-safe query builder library for Rust that leverages key-paths for SQL-like operations on in-memory collections.

This crate contains the core query building logic, without proc-macros or derive functionality.

Features

• Type-safe queries with compile-time checking
• SQL-like operations: WHERE, SELECT, ORDER BY, GROUP BY, JOIN
• Rich aggregations: COUNT, SUM, AVG, MIN, MAX
• Pagination: LIMIT and SKIP
• Join operations: INNER, LEFT, RIGHT, CROSS
• Zero-cost abstractions
• Clone-free operations
• Lazy evaluation with early termination
• Extension traits for ergonomic API
• Helper macros to reduce boilerplate

Example

use rust_queries_core::{Query, QueryExt};
use key_paths_derive::Keypaths;

#[derive(Keypaths)]
struct Product {
    id: u32,
    name: String,
    price: f64,
}

let products = vec![
    Product { id: 1, name: "Laptop".to_string(), price: 999.99 },
    Product { id: 2, name: "Mouse".to_string(), price: 29.99 },
];

// Using extension trait
let query = products.query().where_(Product::price_r(), |&p| p > 100.0);
let expensive = query.all();