Hibernate: Mapping custom column names in stored procedure named query

Question

I currently have the following named query that wraps around a stored procedure:-

Answer 1

For non-managed and non-entity types you still want to use types transformer that do support @Column annotation. Here's how:

Here's entity type:

@Data /* lombok */
public class MyType {
    @Column(name = "field1")
    private String normalFieldName;
    @Column(name = "field2")
    private String normalFieldNameAnother;
}

Here's repository function code:

  // alias mapper that do convert from column manes to field names based on @Column annotation 
    Function aliasesTransformer = new Function() {
        private final Map fieldAliasToField = Stream.of(FieldUtils.getFieldsWithAnnotation(MyType.class, Column.class))
                .collect(Collectors.toMap(f -> f.getAnnotation(Column.class).name(), Functions.identity()));
        @Override
        public String[] apply(String[] o) {
            return Stream.of(o).map(el -> {
                if (fieldAliasToField.containsKey(el)) {
                    return fieldAliasToField.get(el).getName();
                } else {
                    return el;
                }
            }).toArray(String[]::new);
        }
    };

String sql = "select\n"
            + "    h.field1, "
            + "    s.field2, "
            + "from "
            + "    table1 s, "
            + "    table2 h "
            + "where "
            + "    s.common_key = h.common_key";
    EntityManager em = emf.createEntityManager();
    //noinspection unchecked
    List res = (List)em.createNativeQuery(sql)
            .unwrap(org.hibernate.query.Query.class)
            .setResultTransformer(new AliasToBeanResultTransformer(MyType.class) {
                @Override
                public Object transformTuple(Object[] tuple, String[] aliases) {
                    return super.transformTuple(tuple, aliasesTransformer.apply(aliases));
                }
            }).list();