OSCEntityManager.java 文件源码

/**
 * Find list of children entities by their parent Id
 *
 * @param parentEntityName
 *            The parent entity name by which id will be queried.
 * @param parentId
 *            Parent entity identifier for which children are queried.
 * @return List of children owned by parent entity
 */
public List<T> findByParentId(String parentEntityName, Long parentId, String... orderby) {

    CriteriaBuilder cb = this.em.getCriteriaBuilder();

    CriteriaQuery<T> query = cb.createQuery(this.clazz);

    Root<T> root = query.from(this.clazz);
    query = query.select(root)
            .distinct(true)
            .where(
            cb.equal(root.join(parentEntityName).get("id"), parentId));

    if (orderby != null) {
        query = query.orderBy(Arrays.stream(orderby)
                .map(f -> cb.asc(root.get(f)))
                .toArray(i -> new Order[i]));
    }

    List<T> list = this.em.createQuery(query).getResultList();

    return list;
}