ScalaQuery

ScalaQuery is an open-source library for the Scala programming language that provides a type-safe, embedded approach to querying relational databases. It allows developers to write queries and data manipulation operations in Scala, which are translated to SQL and executed through a JDBC driver. The library emphasizes compile-time type safety and composability, enabling construction of complex queries by combining smaller parts in a functional style.

The library offers mappings between database tables and Scala types and provides a domain-specific language for expressing selects, inserts, updates, and deletes. Queries are designed to be composed using standard Scala constructs, enabling a fluent, declarative style that helps catch type errors at compile time. The integration with JDBC means it can work with a wide range of relational databases.

In usage, developers define how tables map to Scala classes, build queries through the ScalaQuery DSL, and run them to obtain results or perform data modifications. The framework typically handles result mapping, parameter binding, and basic transaction support, aiming to reduce boilerplate and provide a consistent data access experience across databases.

Historically, ScalaQuery was an early, influential Scala ORM/query library. It served as a precursor to later Scala data-access projects, contributing ideas such as type-safe, embedded query composition that influenced subsequent developments in the Scala ecosystem.