SeaORM (Rust): Async ORM vs Diesel & SQLx

TL;DR: SeaORM is a fully async ORM for Rust that supports PostgreSQL, MySQL, and SQLite. It generates entity structs from your database schema (or vice versa), provides a fluent query builder, and integrates with Tokio. Compared to Diesel (synchronous, compile-time queries) and SQLx (async, raw SQL), SeaORM sits in the middle: async + ORM conveniences + runtime query building. Use it when you want ActiveRecord-style ergonomics in async Rust.

What Is SeaORM?

SeaORM is an async-first ORM that maps database tables to Rust structs and provides a type-safe query API.

[dependencies]
sea-orm = { version = "1", features = ["sqlx-postgres", "runtime-tokio-rustls", "macros"] }
tokio = { version = "1", features = ["full"] }

Entity structs represent database tables. SeaORM can generate them from an existing database using sea-orm-cli, or you define them manually.

How Do You Define an Entity?

Each table maps to a module with Entity, Column, Model, and ActiveModel types.

use sea_orm::entity::prelude::*;
 
#[derive(Clone, Debug, PartialEq, DeriveEntityModel)]
#[sea_orm(table_name = "users")]
pub struct Model {
    #[sea_orm(primary_key)]
    pub id: i32,
    pub name: String,
    pub email: String,
}
 
#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
pub enum Relation {}
 
impl ActiveModelBehavior for ActiveModel {}

The DeriveEntityModel macro generates all the boilerplate: column enums, primary key handling, and ActiveModel for inserts/updates.

How Do You Query the Database?

SeaORM provides a fluent builder API for SELECT, INSERT, UPDATE, and DELETE.

use sea_orm::{Database, EntityTrait, QueryFilter, ColumnTrait};
 
let db = Database::connect("postgres://localhost/mydb").await?;
 
// SELECT * FROM users WHERE id = 1
let user = User::find_by_id(1).one(&db).await?;
 
// SELECT * FROM users WHERE name LIKE 'Alice%'
let users = User::find()
    .filter(user::Column::Name.starts_with("Alice"))
    .all(&db)
    .await?;
 
// INSERT
let new_user = user::ActiveModel {
    name: Set("Bob".to_string()),
    email: Set("[email protected]".to_string()),
    ..Default::default()
};
let result = User::insert(new_user).exec(&db).await?;

SeaORM vs Diesel vs SQLx in 2026

Diesel is sync + compile-time. SQLx is async + raw SQL. SeaORM is async + ORM fluent API; the middle ground.

If you want maximum compile-time safety and are comfortable with a steeper learning curve, choose Diesel. If you prefer writing raw SQL with async support and query! macro verification, choose SQLx. If you want ActiveRecord-style ergonomics, entity code generation, and async in 2026, SeaORM 1.x is the pragmatic pick.

Frequently Asked Questions

Sources

• SeaORM docs
• sea-orm on crates.io
• SeaORM GitHub; SeaQL/sea-orm
• SeaORM 1.0 Release Notes

What About Relations and Joins?

SeaORM supports belongs-to, has-one, and has-many relations via the Relation enum and Related trait.

#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
pub enum Relation {
    #[sea_orm(has_many = "super::post::Entity")]
    Post,
}
 
impl Related<super::post::Entity> for Entity {
    fn to() -> RelationDef {
        Relation::Post.def()
    }
}
 
// Query with a join:
let users_with_posts = User::find()
    .find_with_related(Post)
    .all(&db)
    .await?;

Eager loading uses .find_with_related() which issues two queries and stitches results in Rust; avoiding the N+1 problem without complex SQL joins.

Related Glossary Terms

• sqlx: Async SQL toolkit without the ORM layer
• diesel: Synchronous ORM with compile-time query checking
• tokio: The async runtime SeaORM is built on
• axum: Common web framework pairing with SeaORM
• async-await: SeaORM's entire API is async/await based
• derive: SeaORM relies heavily on derive macros for entity generation

Keep Reading

• Rust Backend Frameworks Compared: SeaORM vs SQLx vs Diesel for production use
• Rust vs Go in 2026: Language-level tradeoffs for backend services