kotlin-exposed-patterns

SKILL.md

Kotlin Exposed Patterns

Comprehensive patterns for database access with JetBrains Exposed ORM, including DSL queries, DAO, transactions, and production-ready configuration.

When to Use

Setting up database access with Exposed

Writing SQL queries using Exposed DSL or DAO

Configuring connection pooling with HikariCP

Creating database migrations with Flyway

Implementing the repository pattern with Exposed

Handling JSON columns and complex queries

How It Works

Exposed provides two query styles: DSL for direct SQL-like expressions and DAO for entity lifecycle management. HikariCP manages a pool of reusable database connections configured via HikariConfig. Flyway runs versioned SQL migration scripts at startup to keep the schema in sync. All database operations run inside newSuspendedTransaction blocks for coroutine safety and atomicity. The repository pattern wraps Exposed queries behind an interface so business logic stays decoupled from the data layer and tests can use an in-memory H2 database.

Examples