Date: 2005-02-02T19:49:09 Editor: MichelleCaisse Wiki: Apache JDO Wiki Page: MetadataMappings URL: http://wiki.apache.org/jdo/MetadataMappings
no comment Change Log: ------------------------------------------------------------------------------ @@ -16,3 +16,11 @@ '''Question:''' <inheritance> takes a <join> element according to the dtd. Is this used to specify the primary key in the Joined Tables pattern? If so, how is it used, syntactically? +When the inheritance pattern is One Table, a <discriminator> element must be used in the metadata to specify the discriminator strategy and column, used to distinguish the classes that may be represented in the table. +||Nested under <inheritance>||Nested under subclass <class> element|| +|| <discriminator value="value-map" column="column_name">|| <discriminator value="pick_a_value">|| +|| <discriminator value="class-name" column="column_name">||n/a|| + +'''Question:''' What about index element or indexed attribute of <discriminator>? These are in the dtd, but not mentioned in Chapter18TestCoverageNotes. + +So combining inheritance pattern with discriminator strategy, there are four cases that must be tested.
