How to use Anorm outside of Play? - scala

Question

How do you use Anorm outside of play in Scala? In the Anorm document for play, it simply uses something like:
DB.withConnection { implicit c =>
val result: Boolean = SQL("Select 1").execute()
}
The DB object is only for Play. How do you use Anorm alone without using Play?

Answer 1

There is no need of DB object (part of Play JDBC not Anorm). Anorm works as along as you provide it connection as implicit:
implicit val con: java.sql.Connection = ??? // whatever you want to resolve connection
SQL"SELECT * FROM Table".as(...)
You can resolve JDBC connection in many way: basic DriverManager.getConnection, JNDI, ...
As for dependency, it's easy to add it in SBT: How to declare dependency on Play's Anorm for a standalone application? .

Answer 2

You could also emulate the DB object as follows (i haven't tried this though)
object DB {
def withConnection[A](block: Connection => A): A = {
val connection: Connection = ConnectionPool.borrow()
try {
block(connection)
} finally {
connection.close()
}
}
}
Taken from https://github.com/TimothyKlim/anorm-without-play/blob/master/src/main/scala/Main.scala

Answer 3

Documenting the code that works for me below:
Entry to include in dependencies in build.sbt:
// https://mvnrepository.com/artifact/org.playframework.anorm/anorm
libraryDependencies += "org.playframework.anorm" %% "anorm" % "2.6.7"
Write helper classes:
#Singleton
class DBUtils {
val schema = AppConfig.defaultSchema
def withDefaultConnection(sqlQuery: SqlQuery) = {
// could replace with DBCP, not got a chance yet
val conn = DriverManager.getConnection(AppConfig.dbUrl,AppConfig.dbUser, AppConfig.dbPassword)
val result = Try(sqlQuery.execute()(conn))
conn.close()
result
}
}
object DBUtils extends DBUtils
Next, any query can use the withDefaultConnection method to execute:
def saveReviews(listOfReviews: List[Review]):Try[Boolean]= {
val query = SQL(
s"""insert into aws.reviews
| ( reviewerId,
| asin,
| overall,
| summary,
| unixReviewTime,
| reviewTime
| )
|values ${listOfReviews.mkString(",")}""".stripMargin)
//println(query.toString())
DBUtils.withDefaultConnection(query)
}