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Using jOOQ with JPA Native Query
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
If your query doesn't really map to JPA entities, you can fetch ordinary, untyped Object[] representations for your database records by using the following utility method:
static List<Object[]> nativeQuery(EntityManager em, org.jooq.Query query) {
// Extract the SQL statement from the jOOQ query:
Query result = em.createNativeQuery(query.getSQL());
// Extract the bind values from the jOOQ query:
List<Object> values = query.getBindValues();
for (int i = 0; i < values.size(); i++) {
result.setParameter(i + 1, values.get(i));
}
return result.getResultList();
}
Note, if you're using custom data types or bindings, make sure to take those into account as well. E.g. as follows:
static List<Object[]> nativeQuery(EntityManager em, org.jooq.Query query) {
// Extract the SQL statement from the jOOQ query:
Query result = em.createNativeQuery(query.getSQL());
// Extract the bind values from the jOOQ query:
int i = 1;
for (Param<?> param : query.getParams().values())
if (!param.isInline())
result.setParameter(i++, convertToDatabaseType(param));
return result.getResultList();
}
static <T> Object convertToDatabaseType(Param<T> param) {
return param.getBinding().converter().to(param.getValue());
}
This way, you can construct complex, type safe queries using the jOOQ API and have your javax.persistence.EntityManager execute it with all the transaction semantics attached:
List<Object[]> books =
nativeQuery(em, DSL.using(configuration)
.select(AUTHOR.FIRST_NAME, AUTHOR.LAST_NAME, BOOK.TITLE)
.from(AUTHOR)
.join(BOOK).on(AUTHOR.ID.eq(BOOK.AUTHOR_ID))
.orderBy(BOOK.ID));
books.forEach((Object[] book) -> System.out.println(book[0] + " " + book[1] + " wrote " + book[2]));
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