How to map dynamic query to projection interface. not an entity class - spring

Question

#Entity
#Table(name = "delivery_status_summary", schema = "dsd")
#Data
public class DeliveryStatusSummaryV2 {
#Id
#GeneratedValue(strategy=GenerationType.SEQUENCE, generator="delivery_status_summary_id_seq")
#SequenceGenerator(name="delivery_status_summary_id_seq", sequenceName="delivery_status_summary_id_seq", allocationSize=1)
private Integer id;
#Column(name = "expected_delivery_date")
private LocalDateTime expectedDeliveryDate;
private Integer total;
#Column(name = "on_time")
private Integer onTime;
private Integer late;
private Integer pending;
#Column(name = "not_received")
private Integer notReceived;
}
Repository:
public interface DeliveryStatusSummaryRepository extends JpaRepository<DeliveryStatusSummary, Integer>, DeliveryStatusSummaryCustomRepository {
//language=SQL
String MANAGER_DELIVERY = "WITH dates AS (" +
" SELECT" +
" GENERATE_SERIES(" +
" CAST(:range_start AS TIMESTAMP)," +
" CAST(:range_end AS TIMESTAMP)," +
" INTERVAL '1 day'" +
" ) AS day" +
"), deliveries AS (" +
" SELECT *" +
" FROM dsd.delivery_status_summary AS dss" +
" WHERE dss.expected_delivery_date >= CAST(:range_start AS TIMESTAMP) AND" +
" dss.expected_delivery_date <= CAST(:range_end AS TIMESTAMP)" +
"), managers AS (" +
" SELECT *" +
" FROM dsd.teams as t" +
" WHERE t.manager_id IN (:manager_ids)" +
"), summary AS (" +
" SELECT t.manager_id," +
" dss.expected_delivery_date," +
" CAST(dss.expected_delivery_date AS DATE) AS day," +
" SUM(dss.total) AS total," +
" SUM(dss.on_time) AS on_time," +
" SUM(dss.late) AS late," +
" SUM(dss.pending) AS pending," +
" SUM(dss.not_received) AS not_received" +
" FROM deliveries AS dss" +
" INNER JOIN dsd.sla_datasets AS s ON dss.sla_id = s.sla_id" +
" INNER JOIN dsd.datasets AS ds ON ds.dataset_id = s.dataset_id" +
" INNER JOIN managers AS t on ds.team_id = t.ad_id" +
" INNER JOIN dsd.employee AS e on t.manager_id = e.id" +
" GROUP BY t.manager_id, dss.expected_delivery_date" +
")" +
"SELECT d.day AS expectedDeliveryDate, " +
"s.manager_id, " +
"COALESCE(s.total, 0) AS totalCount, " +
"COALESCE(s.on_time, 0) AS onTimeCount, " +
"COALESCE(s.late, 0) AS lateCount, " +
"COALESCE(s.pending, 0) AS pendingCount, " +
"COALESCE(s.not_received, 0) AS notReceivedCount " +
"FROM dates AS d " +
"LEFT JOIN summary AS s ON d.day = s.day " +
"ORDER BY s.manager_id, d.day";
#Query(value = MANAGER_DELIVERY, nativeQuery = true)
CompletableFuture<List<DeliveryStatusSummaryByManagerAndDate>> getDailyDeliveryStatusSummaryByManagers(
#Param("manager_ids") final Set<String> employeeIds,
#Param("range_start") ZonedDateTime rangeStart,
#Param("range_end") ZonedDateTime rangeEnd
);
}
Projection.
public interface DeliveryStatusSummaryByManagerAndDate {
String getManagerId();
LocalDate getExpectedDeliveryDate();
int getTotalCount();
int getOnTimeCount();
int getLateCount();
int getPendingCount();
int getNotReceivedCount();
}
getDailyDeliveryStatusSummaryByManagers works as expected.
But I need to have an opportunity to change group by section of this query on-the-fly, depending on user's input. So I decided to play with query as a plain string.
The idea is to put a query to string, and then depending on user's input, make query.replace('group placeholder', group by <needed list of fields>).
In order to archive this, I created a custom DeliveryStatusSummaryCustomRepository.
I decided not to make replace on a string so far, but to try to execute a simple query MANAGER_DELIVERY_QUERY.
public interface DeliveryStatusSummaryCustomRepository {
List<DeliveryStatusSummaryByManagerAndDate> getDailyDeliveryStatusSummaryByManagersV2();
}
#Repository
public class DeliveryStatusSummaryCustomRepositoryImpl implements DeliveryStatusSummaryCustomRepository {
private String MANAGER_DELIVERY_QUERY_TRY = "SELECT '1' AS managerId, " +
"CAST(dss.expected_delivery_date AS DATE) AS expectedDeliveryDate, " +
"0 AS totalCount, " +
"0 AS onTimeCount, " +
"0 AS lateCount, " +
"0 AS pendingCount, " +
"0 AS notReceivedCount " +
"FROM dsd.delivery_status_summary AS dss " +
"WHERE dss.expected_delivery_date >= CAST('01-01-2022' AS TIMESTAMP) AND dss.expected_delivery_date <= CAST('10-01-2022' AS TIMESTAMP)";
private final PrimaryDbConfig primaryDbConfig;
public DeliveryStatusSummaryCustomRepositoryImpl(PrimaryDbConfig primaryDbConfig) {
this.primaryDbConfig = primaryDbConfig;
}
#Override
public List<DeliveryStatusSummaryByManagerAndDate> getDailyDeliveryStatusSummaryByManagersV2() {
final LocalContainerEntityManagerFactoryBean em = primaryDbConfig.primaryEntityManager();
final EntityManager nativeEntityManager = em.createNativeEntityManager(new HashMap<>());
final Query query = nativeEntityManager.createQuery(MANAGER_DELIVERY_QUERY_TRY);
return query.getResultList();
}
}
But I got an error:
org.hibernate.hql.internal.ast.QuerySyntaxException: delivery_status_summary is not mapped
at org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:169)
at org.hibernate.hql.internal.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:91)
at org.hibernate.hql.internal.ast.tree.FromClause.addFromElement(FromClause.java:77)
at org.hibernate.hql.internal.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:333)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3765)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3654)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:737)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:593)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:330)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:278)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:276)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:192)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:144)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:113)
at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:73)
at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:162)
at org.hibernate.internal.AbstractSharedSessionContract.getQueryPlan(AbstractSharedSessionContract.java:613)
at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:725)
at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:23)
at amp.ae.dataset.status.dashboard.library.repository.primary.DeliveryStatusSummaryCustomRepositoryImpl.getDailyDeliveryStatusSummaryByManagersV2(DeliveryStatusSummaryCustomRepositoryImpl.java:115)
at amp.ae.dataset.status.dashboard.library.repository.primary.DeliveryStatusSummaryCustomRepositoryImpl$$FastClassBySpringCGLIB$$f0397
I believe that the issue is related to DeliveryStatusSummaryByManagerAndDate is not entity, this is just projection.
If so, what approach to use for writing dynamic query taking into account that MANAGER_DELIVERY query is quite complicated to be re-written with Hibernate joins?
I heard about https://www.jooq.org.
Any advice appreciated.

Answer 1

You need to use EntityManager.createNativeQuery() method.
Also you can just autoware EntityManager
#Repository
public class DeliveryStatusSummaryCustomRepositoryImpl {
#PersistenceContext
private EntityManager entityManager;
}
To map query results to DTO
Replace the interface DeliveryStatusSummaryByManagerAndDate with POJO with getters and setters.
Use a result transformer from Hibernate
import org.hibernate.query.Query;
Query<DeliveryStatusSummaryByManagerAndDate> query = entityManager
.createNativeQuery(sql)
.unwrap(Query.class)
.setResultTransformer(
Transformers.aliasToBean(DeliveryStatusSummaryByManagerAndDate.class)
);
return query.getResultList();
Also check this mapping Hibernate query results to custom class?