Diesel is a safe, extensible ORM and query builder for Rust that eliminates boilerplate for database interaction while maintaining performance through compile-time type checking.
The tool solves the problem of writing database code safely and concisely by leveraging Rust's type system to catch errors at compile time rather than runtime. It provides a query builder that feels idiomatic to Rust, allowing developers to construct both simple and complex queries with zero runtime overhead. Codegen capabilities automatically generate boilerplate for mapping between Rust structs and database rows, reducing the amount of manual mapping code required. The tool supports raw SQL when needed for queries that are easier or impossible to express through the query builder.
Diesel suits projects where type safety and compile-time guarantees matter, particularly those already committed to Rust. It works well for applications that need to interact with PostgreSQL, MySQL, SQLite, or MariaDB. Developers should choose it if they want to eliminate entire categories of runtime database errors and prefer expressing queries in Rust rather than as strings. The tool is particularly valuable for teams that want to reduce boilerplate without sacrificing performance or type safety.
The project maintains an active discussion forum for users seeking help and proposing features. Development follows a structured contribution process with documented guidelines for local setup and coding standards. The project has established notable institutional support through multiple sponsors backing ongoing work.
