Use single inheritance type in the hierarchy by default
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Key: OPENJPA-1096
URL: https://issues.apache.org/jira/browse/OPENJPA-1096
Project: OpenJPA
Issue Type: Improvement
Reporter: Serge Bogatyrev
As reported the current strategy of inheritance types mixing violates standards.
Example:
@Inheritance(strategy = TABLE_PER_CLASS) abstract class A ...
class B extends A ...
abstract class C extends A ...
class D extends C ...
class E extends C ...
For this hierarchy class "B" has its own table, but classes "D" and "E" are
mapped into the same table. But all classes should be mapped with the same
inheritance type declared in the *root* class. There is only one annotation
@Inheritance in this hierarchy.
To get mixing of inheritance types in the same hierarchy additional
@Inheritance annotations should be used. For example to declare mapping of
classes "D" and "E" into the same table we should add @Inheritance annotation
to class "C":
@Inheritance(strategy = TABLE_PER_CLASS) abstract class A ...
class B extends A ...
@Inheritance(strategy = SINGLE_TABLE) abstract class C extends A ...
class D extends C ...
class E extends C ...
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