trait ColumnMapper[T] extends AnyRef
Produces ColumnMapForReading or ColumnMapForWriting objects that map
class T
properties to columns in a given Cassandra table.
You can associate a custom ColumnMapper
object with any of your classes by
providing an implicit ColumnMapper
in the companion object of the mapped class:
CREATE TABLE kv(key int primary key, value text);
case class KeyValue(k: Int, v: String) object KeyValue { implicit val columnMapper = new DefaultColumnMapper[KeyValue](Map("k" -> "key", "v" -> "value")) }
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abstract
def
columnMapForReading(struct: StructDef, selectedColumns: IndexedSeq[ColumnRef]): ColumnMapForReading
Provides a mapping between given table or UDT and properties of type
T
, useful for creating objects of typeT
.Provides a mapping between given table or UDT and properties of type
T
, useful for creating objects of typeT
. Throws IllegalArgumentException ifselectedColumns
does not provide some columns needed to instantiate object of typeT
-
abstract
def
columnMapForWriting(struct: StructDef, selectedColumns: IndexedSeq[ColumnRef]): ColumnMapForWriting
Provides a mapping between given table or UDT and properties of type
T
, useful for reading property values of typeT
and writing them to Cassandra.Provides a mapping between given table or UDT and properties of type
T
, useful for reading property values of typeT
and writing them to Cassandra. Throws IllegalArgumentException ifselectedColumns
contains some columns that don't have matching getters. -
abstract
def
newTable(keyspaceName: String, tableName: String, protocolVersion: ProtocolVersion = ProtocolVersion.DEFAULT): TableDef
Provides a definition of the table that class
T
could be saved to.
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(Since version ) see corresponding Javadoc for more information.