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Diffstat (limited to 'src/library/scala/dbc/statement/SetQuantifier.scala')
| -rw-r--r-- | src/library/scala/dbc/statement/SetQuantifier.scala | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/library/scala/dbc/statement/SetQuantifier.scala b/src/library/scala/dbc/statement/SetQuantifier.scala new file mode 100644 index 0000000000..a2fbbb854a --- /dev/null +++ b/src/library/scala/dbc/statement/SetQuantifier.scala @@ -0,0 +1,30 @@ +/* __ *\ +** ________ ___ / / ___ Scala API ** +** / __/ __// _ | / / / _ | (c) 2003-2005, LAMP/EPFL ** +** __\ \/ /__/ __ |/ /__/ __ | ** +** /____/\___/_/ |_/____/_/ | | ** +** |/ ** +\* */ + +package scala.dbc.statement; + +/** A set quantifier that defines the collection type of a relation. */ +abstract class SetQuantifier { + /** A SQL-99 compliant string representation of the set quantifier. */ + def sqlString: String; +} + +object SetQuantifier { + /** A set quantifier that defines a relation as being a bag. That means + * that duplicates are allowed. */ + case object AllTuples extends SetQuantifier { + /** A SQL-99 compliant string representation of the set quantifier. */ + def sqlString: String = "ALL"; + } + /** A set quantifier that defines a relation as being a set. That means + * that duplicates are not allowed and will be pruned. */ + case object DistinctTuples extends SetQuantifier { + /** A SQL-99 compliant string representation of the set quantifier. */ + def sqlString: String = "DISTINCT"; + } +}
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