How to convert my native SQL query into a JPQL query - sql

Question

I'm trying to convert a native SQL query into a JPQL query. Presented first are the JPA entities and the repository interface:
LearnerActivity
#Entity
#Table(name = "learner_activity")
public class LearnerActivity implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#ManyToMany
#JoinTable(name = "learner_activity_unit",
joinColumns = #JoinColumn(name="learner_activitys_id", referencedColumnName="ID"),
inverseJoinColumns = #JoinColumn(name="units_id", referencedColumnName="ID"))
private Set<Unit> units = new HashSet<>();
#ManyToMany
#Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
#JoinTable(name = "learner_activity_performance_criteria",
joinColumns = #JoinColumn(name="learner_activitys_id", referencedColumnName="ID"),
inverseJoinColumns = #JoinColumn(name="performance_criterias_id", referencedColumnName="ID"))
private Set<PerformanceCriteria> performanceCriterias = new HashSet<>();
}
LearnerJobOnSiteChecklistSectionItem
#Entity
#Table(name = "learner_job_on_site_checklist_section_item")
public class LearnerJobOnSiteChecklistSectionItem implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#ManyToOne
#JoinColumn(name = "learner_activity_id")
private LearnerActivity learnerActivity;
}
LearnerPortfolioPerformanceCriteriaAchievement
#Entity
#Table(name = "learner_portfolio_performance_criteria_achievement")
public class LearnerPortfolioPerformanceCriteriaAchievement implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#ManyToOne
#JoinColumn(name = "performance_criteria_id")
private PerformanceCriteria performanceCriteria;
#ManyToMany
#Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
#JoinTable(name = "learner_portfolio_performance_criteria_achievement_learner_job_on_site_checklist_section_item",
joinColumns = #JoinColumn(name="learner_portfolio_performance_criteria_achievements_id", referencedColumnName="ID"),
inverseJoinColumns = #JoinColumn(name="learner_job_on_site_checklist_section_items_id", referencedColumnName="ID"))
private Set<LearnerJobOnSiteChecklistSectionItem> learnerJobOnSiteChecklistSectionItems = new HashSet<>();
}
I'm looking to get all LearnerPortfolioPerformanceCriteriaAchievements which have the same PerformanceCriteria as a given LearnerJobOnSiteChecklistSectionItem's Activity.
LearnerPortfolioPerformanceCriteriaAchievementRepository
public interface LearnerPortfolioPerformanceCriteriaAchievementRepository extends JpaRepository<LearnerPortfolioPerformanceCriteriaAchievement,Long> {
#Query("select distinct lppca from LearnerJobOnSiteChecklistSectionItem si inner join si.learnerActivity la inner join LearnerPortfolioPerformanceCriteriaAchievement lppca where lppca.performanceCriteria member of la.performanceCriterias and si.id =:sectionItemId")
public List<LearnerPortfolioPerformanceCriteriaAchievement> findForSectionItem(#Param("sectionItemId") Long sectionItemId);
}
Native SQL
SELECT
a.id
FROM
learner_job_on_site_checklist_section_item AS i
JOIN
learner_activity_performance_criteria AS c
ON
c.learned_activitys_id = i.learned_activitys_id
INNER JOIN
learner_portfolio_performance_criteria_achievement AS a
ON
a.performance_criteria_id = c.performance_criterias_id
where i.id = 2
Understanding that I can replace my SQL ON with WHERE clauses, my best JPQL attempt so far is this:
SELECT
DISTINCT lppca
FROM
LearnerJobOnSiteChecklistSectionItem si
INNER JOIN
si.learnerActivity la
INNER JOIN
LearnerPortfolioPerformanceCriteriaAchievement lppca
WHERE
lppca.performanceCriteria MEMBER OF la.performanceCriterias
AND si.id =:sectionItemId
However, running this JPQL throws the following exception:
Caused by: java.lang.IllegalStateException: No data type for node: org.hibernate.hql.internal.ast.tree.IdentNode
\-[IDENT] IdentNode: 'lppca' {originalText=lppca}

Answer 1

The following query will work:
SELECT
a
FROM
LearnerPortfolioPerformanceCriteriaAchievement a
, LearnerActivity v
, LearnerJobOnSiteChecklistSectionItem i
WHERE
i.id = :sectionItemId
AND i.learnerActivity = v
AND a.performanceCriteria MEMBER OF v.performanceCriterias
AND i MEMBER OF a.learnerJobOnSiteChecklistSectionItems
Have created a sample application to test the query (I have used shorter and simpler class names to make it easy to read).