This is a Scala data binder library for Cassandra based upon a DataStax Java Driver for Cassandra.
Here is the sample of Scala class that is initialized with Cassandra session and allows you to do select/insert of some user data.
class Db(session: com.datastax.driver.core.Session) {
import ExecutionContext.Implicits.global
implicit val cache = new SessionQueryCache[PlainConverter](session)
// class for binding input/output parameters
case class User(userId: Int, name: String)
def insertUser(user: User): Future[Unit] = cql"insert into users(userid, name) values (?, ?)".bind(user).execute()
// returns Future[Iterator[User]]
def selectAllUsers: Future[Iterator[User]] = cql"select * from users".all[User]
// if no user is found will throw NoRowsSelectedException
def selectUser(userId: Int) = cql"select * from users where userId = $userId".one[User]
// if no user is found will return None, otherwise Some(User)
def selectUserIfFound(userId: Int) = cql"select * from users where userId = $userId".oneOption[User]
}
And this class could be used like this:
val cluster = Cluster.builder().addContactPoint("127.0.0.1").build()
val session = cluster.connect("binder_test")
val db = new Db(session)
Await.result(db.insertUser(db.User(9, "John")), 10 seconds)
val users = Await.result(db.selectAllUsers, 10 seconds)
println(users.toList)
For the unit tests and sample application working local instance of Cassandra is required. Please see also sample project inside samples/ folder and schema in db/dbscript.cql
To use library, add this line to the build.sbt file:
libraryDependencies += "com.hypertino" %% "cassandra-binders" % "0.3-SNAPSHOT"
Product licensed under BSD 3-clause as stated in file LICENSE
