HHH-16994 migration guide update
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@ -384,4 +384,50 @@ The integration of static metamodel generation in a project has changed; the rec
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Check out the specific sections in the User Guide for a guideline on how to do this for {userGuideBase}#tooling-gradle-modelgen[Gradle] or {userGuideBase}#tooling-maven-modelgen[Maven].
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Check out the specific sections in the User Guide for a guideline on how to do this for {userGuideBase}#tooling-gradle-modelgen[Gradle] or {userGuideBase}#tooling-maven-modelgen[Maven].
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[[mative-query]]
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== Native query with joins
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A Native query that uses a result set mapping, explicit or implicitly by specifying an entity class as result type to `createNativeQuery`,
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requires unique select item aliases.
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If the native query contains a join to a table with same named columns, a query that e.g. does `select * from ..` will lead to an error.
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If the desire is to select only columns for the result type entity, prefix the * with a tables alias e.g.
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`select p.* from ...`
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E.g.
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```
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@Entity
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class Person {
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@Id
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private Long id;
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@OneToMany(mappedBy = "person")
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private Set<Dog> dogs = new HashSet<>( 0 );
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}
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@Entity
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class Dog {
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@Id
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private Long id;
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}
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```
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Queries like
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```
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session.createNativeQuery(
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"SELECT * FROM person p LEFT JOIN dog d on d.person_id = p.id", Person.class )
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.getResultList();
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```
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have to be changed to
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```
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session.createNativeQuery(
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"SELECT p.* FROM person p LEFT JOIN dog d on d.person_id = p.id", Person.class )
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.getResultList();
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```
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