Crate rust_queries_builder 

Rust Query Builder

A powerful, type-safe query builder library for Rust that leverages key-paths for SQL-like operations on in-memory collections.

Features

• Type-safe queries: Compile-time type checking using key-paths
• SQL-like operations: WHERE, SELECT, ORDER BY, GROUP BY, JOIN
• Aggregations: COUNT, SUM, AVG, MIN, MAX
• Pagination: LIMIT and SKIP operations
• Join operations: INNER JOIN, LEFT JOIN with custom predicates
• Zero-cost abstractions: Leverages Rust’s zero-cost abstractions

Example

use rust_queries_builder::{Query, QueryExt};
use key_paths_derive::Keypath;

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

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

// Using extension trait - most ergonomic
let query = products.query().where_(Product::category_r(), |cat| cat == "Electronics");
let electronics = query.all();

// Traditional approach
let affordable = Query::new(&products)
    .where_(Product::price_r(), |&price| price < 100.0)
    .all();

// Lazy evaluation for better performance
let total = products.lazy_query().sum_by(Product::price_r());

Modules

datetime

DateTime operations for query builder.

ext

join

Join query implementation for combining multiple collections.

lazy

Lazy query implementation using iterators.

lock_ext

Extended lock support for parking_lot and tokio.

lock_join

JOIN operations for locked data structures.

lock_lazy

Lazy query support for locked data structures.

lock_query

Full SQL-like query support for locked data structures.

lock_view

View-like functionality for locked data.

locks

Lock-aware querying for thread-safe data structures.

macros

Macros to simplify query building and reduce boilerplate.

query

Query builder implementation for filtering, selecting, ordering, grouping, and aggregating data.

queryable

Queryable trait for supporting multiple container types.

Macros

avg_where

Quick average aggregation.

collect_lazy

Creates a lazy query and collects results in one line.

count_where

Quick count with filter.

exists_where

Check if any item matches.

filter

Simplified where_ macro that reduces boilerplate.

filter_collect

Quick filter and collect.

find_first

Find first matching item.

lazy_query

Creates a lazy query with multiple filters in a concise syntax.

paginate

Quick pagination.

query

Creates a Query with multiple filters in a concise syntax.

select_all

Select and collect in one line.

select_where

Select with filter.

sum_where

Quick sum aggregation.

Structs

JoinQuery

A query builder for joining two collections.

LazyQuery

A lazy query builder that uses iterators for deferred execution.

LockJoinQuery

A join query builder for locked data structures.

LockLazyQuery

Lazy query for locked data with early termination.

LockQuery

A query builder for locked data structures.

LockView

A reusable query pattern (like a SQL VIEW).

LockedValueRef

A reference to a value behind a lock.

MaterializedLockView

Materialized view - a cached query result.

Query

A query builder for filtering, selecting, ordering, grouping, and aggregating data.

QueryWithSkip

Helper struct for pagination after a skip operation.

Enums

KeyPaths

Go to examples section to see the implementations

Traits

LockIterExt

Extension methods for lock iterators.

LockJoinable

Helper trait for creating join queries from locked collections.

LockJoinableCollection

Helper trait for collections that can participate in joins.

LockLazyQueryable

Extension trait for creating lazy lock queries.

LockQueryExt

Extension trait for querying collections of locks.

LockQueryable

Helper to create LockQuery from HashMap.

LockValue

Helper trait for lock-aware value extraction.

QueryExt

Extension trait that adds eager Query methods directly to slice-like containers

Queryable

Trait for types that can be queried.

QueryableExt

Extension trait for Queryable types that provides query building capabilities.

Derive Macros

Keypath

QueryBuilder

Derive macro to generate helper methods for query building

QueryableDerive

Derive macro to generate Queryable implementations