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Scala example source code file (DerivedColumn.scala)

This example Scala source code file (DerivedColumn.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Scala tags/keywords

as, as, derivedcolumn, expression, expression, none, none, option, some, some, string

The Scala DerivedColumn.scala source code

/*                     __                                               *\
**     ________ ___   / /  ___     Scala API                            **
**    / __/ __// _ | / /  / _ |    (c) 2003-2011, LAMP/EPFL             **
**  __\ \/ /__/ __ |/ /__/ __ |    http://scala-lang.org/               **
** /____/\___/_/ |_/____/_/ | |                                         **
**                          |/                                          **
\*                                                                      */



package scala.dbc
package statement


@deprecated(DbcIsDeprecated, "2.9.0") abstract class DerivedColumn {
  
  /** The value for the column. This value can be of any type but must be
   *  calculated from fields that appear in a relation that takes part
   *  in the query.
   */
  def valueExpression: Expression
  
  /** A new name for this field. This name must be unique for the query in
   *  which the column takes part.
   */
  def asClause: Option[String]
  
  /** A SQL-99 compliant string representation of the derived column
   *  sub-statement. This only has a meaning inside a select statement.
   */
  def sqlString: String =
    valueExpression.sqlInnerString +
    (asClause match {
      case None => ""
      case Some(ac) => " AS " + ac
    })
  
}

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