Exposed is a Kotlin SQL library providing a typesafe DSL for constructing queries and a lightweight DAO framework for database interaction in ORM style.
This page is designed to help you find out whether Exposed is good and if it is the right choice for you.
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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.
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.
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.
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.
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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Check the traffic stats of Exposed on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Check the "Domain Rating" of Exposed on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of Exposed's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Check the "Domain Authority" of Exposed on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
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