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Add a note w/ respect to native queries and inheritance 

Signed-off-by: Jan Schatteman <jschatte@redhat.com>
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Jan Schatteman 2023-03-02 23:32:48 +01:00 committed by Christian Beikov
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commit 516d3eb405
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documentation/src/main/asciidoc/userguide/chapters/query/native/Native.adoc
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@ -342,6 +342,15 @@ include::{doc-emeddable-example-dir}/SQLTest.java[tags=sql-hibernate-dto-query-e
There's no such equivalent in Jakarta Persistence because the `jakarta.persistence.Query` interface does not define a `setResultTransformer` method equivalent.
====
[IMPORTANT]
====
When materializing a native query result as a polymorphic entity, it is important to understand that both the `JOINED` as well as the `TABLE_PER_CLASS` inheritance strategies require that the native query also include a special `clazz_` select item, which returns the subclass id that Hibernate needs to determine the concrete Java type for a row.
The subclass id is determined based on some order and the base class of the entity hierarchy has the number 0.
Refer to the respective sections in the inheritance chapter for examples of this.
====
The above query will return a list of `PersonSummaryDTO` which has been instantiated and injected the values of `id` and `name` into its corresponding properties or fields.
[[sql-inheritance-query]]