Software Alternatives & Startups

Exposed

Exposed is a Kotlin SQL library providing a typesafe DSL for constructing queries and a lightweight DAO framework for database interaction in ORM style.

Exposed

Exposed Reviews and Details

This page is designed to help you find out whether Exposed is good and if it is the right choice for you.

Features & Specs

  1. Kotlin-idiomatic API

    Exposed is written in Kotlin and offers a type-safe DSL and a DAO API that feel natural to Kotlin developers. Queries are checked at compile time, which reduces runtime errors compared to raw SQL strings.

  2. Two flexible abstraction levels

    Developers can choose between the lightweight SQL DSL, which stays close to SQL, and the DAO API, which maps tables to entities. Both can be mixed in the same project, so teams can pick the right level of abstraction for each use case.

  3. Multi-database support

    Exposed supports many relational databases, including H2, MySQL, MariaDB, PostgreSQL, Oracle, and SQL Server (SQLite is also supported). Switching databases or supporting several of them requires few code changes.

  4. Lightweight with low learning curve

    Compared to heavyweight ORMs such as Hibernate, Exposed has a small footprint and less hidden magic like lazy-loading proxies or complex session management. Its behavior is easier to reason about, and setup is simple.

  5. Good ecosystem integration and backing

    It is developed and maintained by JetBrains and integrates well with Ktor, Spring, and Kotlin coroutines (including R2DBC support in newer versions). It also supports Kotlin features like date-time types, JSON columns, and encryption through extension modules.

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