Mixed Joint Parliamentary Assembly question strategy legacy

Table: A, b

Class: A, B, C

@Entity
@Table (name = "A")
@Inheritance (strategy = InheritanceType.JOINED)
@DiscriminatorColumn (name = ' type')
Abstract Class a.

@Entity
@Table (name = "B")
@DiscriminatorValue ('B')
@PrimaryKeyJoinColumn)
Class B extends A


@Entity
@DiscriminatorValue ("C")
Class C extends A


A - b's * @Inheritance (strategy = InheritanceType.JOINED) * and A-C its * @Inheritance (strategy = InheritanceType.SINGLE_TABLE) * by default. When I try to run some test that TopLink identifies the class C as strategy mixed but expects C to have its own table, as the super class A is specified with the strategy attached. Not sure, otherwise how would work mixed strategy!

Any help would be greatly appreciated.

TX
K

Hello

My understanding is that all classes should use the inheritance strategy defined in its parent class - there is no way to have two strategies on a single parent class.

If you aim to get 3 classes (A, B and C) to use two tables (A, B) you could try rather to specifying the root (A) to use SINGLE_TABLE. B will be then automatically has an entry in the table and class B can then be set to use the B chart as well by adding the annotation @SecondaryTable (name = "B"), specifying the joincolumn if primary key field names are different. A and C will then only use table, B will use the table for inherited attributes and the join to Table B - be sure to explicietly define the table to use in all the mappings on B you want to use table B, otherwise I think that the table will assume that it is the primary table.

Best regards
Chris

Tags: Fusion Middleware

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