explaingit

jxs/barrel

Analysis updated 2026-07-09 · repo last pushed 2021-09-18

★ 1RustAudience · developerComplexity · 3/5DormantLicenseSetup · moderate

TLDR

Barrel is a Rust library that lets developers write database structure changes in Rust code instead of hand-writing SQL, then translates that code into the correct SQL commands for databases like PostgreSQL.

Mindmap

mindmap
  root((repo))
    What it does
      Write migrations in Rust
      Generates SQL automatically
      Creates tables and columns
    Tech stack
      Rust
      Diesel integration
      PostgreSQL support
    Use cases
      Web app database setup
      Evolving database structure
      Keeping DB in codebase
    Audience
      Rust developers
      Diesel users
      Open source contributors
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What do people build with it?

USE CASE 1

Set up and evolve a database structure for a Rust web application without writing raw SQL.

USE CASE 2

Create database tables with typed columns directly in Rust code using simple functions.

USE CASE 3

Integrate database migrations into a Rust project that already uses Diesel for data handling.

What is it built with?

RustDieselPostgreSQL

How does it compare?

jxs/barrelabyo-software/ferro-stashariasbruno/glyph
Stars111
LanguageRustRustRust
Last pushed2021-09-18——
MaintenanceDormant——
Setup difficultymoderatemoderateeasy
Complexity3/54/52/5
Audiencedeveloperops devopsdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 30min

Requires a Rust project setup with a compatible database like PostgreSQL and familiarity with the Diesel ecosystem.

Use freely for any purpose, including commercial use, as long as you keep the copyright notice.

In plain English

Barrel is a tool for developers who use the Rust programming language and need to manage how their database is structured. As an app grows, the structure of its database changes, new tables get added, new columns track new pieces of data, and old pieces get reorganized. Barrel lets developers write these structural changes directly in Rust, rather than hand-writing SQL, the standard language for databases. The tool works by providing a set of simple functions that describe what the database should look like. For instance, a developer can write a few lines of code to create a table called "users," then specify that it needs a text column for a name, a number column for an age, and a true/false column for a boolean. Barrel takes those instructions and translates them into the correct SQL commands for a specific database, such as PostgreSQL. This approach is particularly useful for developers who want to keep their database setup inside their main codebase. It also integrates directly with Diesel, a popular data-handling tool in the Rust ecosystem. Someone building a web application in Rust who already uses Diesel to interact with their data would use Barrel to set up and evolve the underlying database structure over time. The main benefit here is abstraction. Instead of switching mental contexts between Rust and raw SQL, a developer can stay in one language. The README doesn't go into deep detail about which specific databases are supported beyond PostgreSQL, though it mentions providing database-specific builders. The project is open-source under the MIT license and emphasizes a welcoming community for contributors.

Copy-paste prompts

Prompt 1
Using the Barrel crate in Rust, write a migration that creates a table called 'users' with a text column for name, an integer column for age, and a boolean column for is_active.
Prompt 2
Help me integrate Barrel with my existing Diesel-based Rust web app so I can manage database schema changes in Rust instead of SQL.
Prompt 3
Show me how to use Barrel to add a new column to an existing PostgreSQL table in my Rust project, and generate the correct SQL migration.

Frequently asked questions

What is barrel?

Barrel is a Rust library that lets developers write database structure changes in Rust code instead of hand-writing SQL, then translates that code into the correct SQL commands for databases like PostgreSQL.

What language is barrel written in?

Mainly Rust. The stack also includes Rust, Diesel, PostgreSQL.

Is barrel actively maintained?

Dormant — no commits in 2+ years (last push 2021-09-18).

What license does barrel use?

Use freely for any purpose, including commercial use, as long as you keep the copyright notice.

How hard is barrel to set up?

Setup difficulty is rated moderate, with roughly 30min to a first successful run.

Who is barrel for?

Mainly developer.

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