Hibernate Native SQL

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Adding joins with entity mapping.

We can also use addEntity() and addJoin() methods to fetch the data from associated table using tables join. The above query can be re-written as following;

A quick sample. Check out the JAVA class and SQL file

// {
        List<Object[]> usersJoin = session
                .createNativeQuery(
                        "select u.*, t.* from user u left outer join team t on u.team_id=t.team_id  where u.user_id=?")
                .addEntity("u", User.class).addJoin("t", "u.team").setParameter(1, 1).list();
        usersJoin.stream().forEach(object -> { // The user's object list would contain a User instance and a
                                                // "joined"
                                                // team instance.
            User userJoin = (User) object[0];
            logger.info("User - " + userJoin.getName());
            logger.info("User Domain - " + userJoin.getDomain().getDomainName());

Notice the second query, which fetches the Domain details. This is the eager Loading of the requested object
[aliasname].* is used to return all properties of an entity. When we use addEntity() and addJoin() with join queries like above it returns both the objects, as shown above.

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5/8 Adding joins with entity mapping

Adding joins with entity mapping.

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