可擴展的Scala ORM框架：SORM

SORM是一個Scala的ORM框架，旨在消除樣板代碼和解決可擴展性問題，通過高層次的抽象和函數式編程風格。

特性：

• 完全抽象的關系概念. You work with case classes, collections and other standard Scala data types instead of tables, rows, foreign keys and relations.
• 從持久層完全分離的域模型. There are no annotations, special types or any other dependencies on persistence layer present in model declaration. This house is clear!
• 一個直觀和集中的連接無關的API. No tangled implicit constructions polluting your namespace and functionality scattered across multiple components. No manual management of connections.
• Concurrency. A single SORM instance can safely be used across multiple threads and seamlessly integrates into actor-based concurrent systems, like Akka.
• 集成連接池. Scalable just by setting a “poolSize” parameter.
• 自動生成數據庫結構

// Declare a model:
case class Artist( name : String, genres : Set[Genre] )
case class Genre( name : String ) 

// Initialize SORM, automatically generating schema:
import sorm._
object Db extends Instance(
  entities = Set( Entity[Artist](), Entity[Genre]() ),
  url = "jdbc:h2:mem:test"
)

// Store values in the db:
val metal = Db.save( Genre("Metal") )
val rock = Db.save( Genre("Rock") )
Db.save( Artist("Metallica", Set(metal, rock) ) )
Db.save( Artist("Dire Straits", Set(rock) ) )

// Retrieve values from the db:
// Option[Artist with Persisted]:
val metallica = Db.query[Artist].whereEqual("name", "Metallica").fetchOne() 
// Stream[Artist with Persisted]:
val rockArtists = Db.query[Artist].whereEqual("genres.item.name", "Rock").fetch() 

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