将 function 结果集映射到 JPA 的 Pojos 列表中

Question

I have the following PostgreSQL function:

CREATE OR REPLACE FUNCTION getFirstNAvailableSlots(N INTEGER, timestamp_start TIMESTAMP, timestamp_end TIMESTAMP,
cpu INTEGER, max_reservable_cpu INTEGER)
returns TABLE (t_start TIMESTAMP, t_end TIMESTAMP)

I would like to call the function, and automatically map the result set into a List of TimeSlots:

public class TimeSlot {

    private Timestamp t_start;
    private Timestamp t_end;
}

So I added a Query in a repository:

public interface WorkstationReservationRepository extends ReservationBaseRepository<WorkstationReservation>{

    @Query(value="SELECT new com.warden.reservationmicroservice.dtos.TimeSlot(t_start,t_end) FROM getFirstNAvailableSlots(:N,:t_start,:t_end,:cpu,:max_reservable_cpu)")
    public List<TimeSlot> getFirstNAvailableSlots(@Param("N")int N, @Param("t_start")Timestamp t_start, @Param("t_end")Timestamp t_end, @Param("cpu") int cpu, @Param("max_reservable_cpu")int max_reservable_cpu);

}

However, I get the following error:

Caused by: java.lang.IllegalArgumentException: Validation failed for query for method public abstract com.warden.reservationmicroservice.dtos.TimeSlot com.warden.reservationmicroservice.repositories.WorkstationReservationRepository.getFirstNAvailableSlots(int,java.sql.Timestamp,java.sql.Timestamp,int,int) at org.springframework.data.jpa.repository.query.SimpleJpaQuery.validateQuery(SimpleJpaQuery.java:100) ~[spring-data-jpa-3.0.0.jar:3.0.0] at org.springframework.data.jpa.repository.query.SimpleJpaQuery.(SimpleJpaQuery.java:70) ~[spring-data-jpa-3.0.0.jar:3.0.0] at org.springframework.data.jpa.repository.query.JpaQueryFactory.fromMethodWithQueryString(JpaQueryFactory.java:55) ~[spring-data-jpa-3.0.0.jar:3.0.0] at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$DeclaredQueryLookupStrategy .resolveQuery(JpaQueryLookupStrategy.java:170) ~[spring-data-jpa-3.0.0.jar:3.0.0] at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$CreateIfNotFoundQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:252) ~[spring-data-jpa-3.0.0.jar:3.0.0] at org.springframework.data.jpa.repository.query.JpaQueryLookupStrategy$AbstractQueryLookupStrategy.resolveQuery(JpaQueryLookupStrategy.java:95) ~[spring-data-jpa-3.0.0.jar:3.0.0] at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.lookupQuery(QueryExecutorMethodInterceptor.java:111) ~[spring-data-commons-3.0.0.jar:3.0.0]... 56 common frames omitted Caused by: java.lang.IllegalArgumentException: org.hibernate.query.sqm.ParsingException: line 1:104 mismatched input '(' expecting {, ',', '.', ID, VERSION, VERSIONED, NATURALID, ALL, AND, ANY, AS, ASC, AVG, BETWEEN, BOTH, BY , CASE, CAST, COLLATE, COUNT, CROSS, CUBE, CURRENT, CURRENT_DATE, CURRENT_INSTANT, CURRENT_TIME, CURRENT_TIMESTAMP, DATE, DATETIME, DAY, DELETE, DESC, DISTINCT, ELEMENT, ELEMENTS, ELSE, EMPTY, END, ENTRY, ERROR, ESCAPE, EVERY, EXCEPT, EXCLUDE, EXISTS, EXTRACT, FETCH, FILTER, FIRST, FOLLOWING, FOR, FORMAT, FROM, FULL, FUNCTION, GROUP, GROUPS, HAVING, HOUR, IGNORE, ILIKE, IN, INDEX, INDICES, INNER, INSERT, INSTANT, INTERSECT, INTO, IS, JOIN, KEY, LAST, LEADING, LEFT, LIKE, LIMIT, LIST, LISTAGG, LOCAL, LOCAL_DATE, LOCAL_DATETIME, LOCAL_TIME, MAP, MAX, MAXELEMENT, MAXINDEX, MEMBER, MICROSECOND, MILLISECOND, MIN, MINELEMENT, MININDEX, MINUTE, MONTH, NANOSECOND, NEW, NEXT, NO, NOT, NULLS, OBJECT, OF, OFFSET, OFFSET_DATETIME, ON, ONLY, OR, ORDER, OTHERS, OUTER, OVER, OVERFLOW, OVERLAY, PAD, PARTITION, PERCENT, PLACING, POSITION, PRECEDING, QUARTER, RANGE, RESPECT, RIGHT, ROLLUP, ROW, ROWS, SECOND, SELECT, SET, SIZE, SOME, SUBSTRING, SUM, THEN, TIES, TI ME, TIMESTAMP, TIMEZONE_HOUR, TIMEZONE_MINUTE, TRAILING, TREAT, TRIM, TRUNCATE, TYPE, UNBOUNDED, UNION, UPDATE, VALUE, VALUES, WEEK, WHEN, WHERE, WITH, WITHIN, WITHOUT, YEAR, IDENTIFIER, QUOTED_IDENTIFIER} at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:147) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final] at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:175) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final] at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:182) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final] at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:760) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final] at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:662) ~[hib ernate-core-6.1.6.Final.jar:6.1.6.Final] at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:126) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final] at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[na:na] at java.base/java.lang.reflect.Method.invoke(Method.java:578) ~[na:na] at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:360) ~[spring-orm-6.0.3.jar:6.0.3] at jdk.proxy2/jdk.proxy2.$Proxy113.createQuery(Unknown Source) ~[na:na] at org.springframework.data.jpa.repository.query.SimpleJpaQuery.validateQuery(SimpleJpaQuery.java:94) ~[spring-data-jpa-3.0.0.jar:3.0.0]... 62 common frames omitted Caused by: org.hibernate.query.sqm.ParsingException : line 1:104 mismatched input '(' expecting {, ',', '.', ID, VERSION, VERSIONED, NATURALID, ALL, AND, ANY, AS, ASC, AVG, BETWEEN, BOTH, BY, CASE, CAST, COLLATE, COUNT, CROSS, CUBE, CURRENT, CURRENT_DATE, CURRENT_INSTANT, CURRENT_TIME, CURRENT_TIMESTAMP, DATE, DATETIME, DAY, DELETE, DESC, DISTINCT, ELEMENT, ELEMENTS, ELSE, EMPTY, END, ENTRY, ERROR, ESCAPE, EVERY, EXCEPT, EXCLUDE, EXISTS, EXTRACT, FETCH, FILTER, FIRST, FOLLOWING, FOR, FORMAT, FROM, FULL, FUNCTION, GROUP, GROUPS, HAVING, HOUR, IGNORE, ILIKE, IN, INDEX, INDICES, INNER, INSERT, INSTANT, INTERSECT, INTO, IS, JOIN, KEY, LAST, LEADING, LEFT, LIKE, LIMIT, LIST, LISTAGG, LOCAL, LOCAL_DATE, LOCAL_DATETIME, LOCAL_TIME, MAP, MAX, MAXELEMENT, MAXINDEX, MEMBER, MICROSECOND, MILLISECOND, MIN, MINELEMENT, MININDEX, MINUTE, MONTH, NANOSECOND, NEW, NEXT, NO, NOT, NULLS, OBJECT, OF, OFFSET, OFFSET_DATETIME, ON, ONLY, OR, ORDER, OTHERS, OUTER, OVER, OVERFLOW, OVERLAY, PAD, PARTITION, PERCENT, PLACING, POSITION, PRECEDING, QUARTER, RANGE, RESPECT, RIGHT, ROLLUP, ROW, ROWS, SECOND, SELECT, SET, SIZE, SOME, SUBSTRING, SUM, THEN, TIES, TIME, TIMESTAMP, TIMEZONE_HOUR, TIMEZONE_MINUTE, TRAILING, TREAT, TRIM, TRUNCATE, TYPE, UNBOUNDED, UNION, UPDATE, VALUE, VALUES, WEEK, WHEN, WHERE, WITH, WITHIN, WITHOUT, YEAR, IDENTIFIER, QUOTED_IDENTIFIER} at org.hibernate.query.hql.internal.StandardHqlTranslator$1.syntaxError(StandardHqlTranslator.java:46) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final] at org.antlr.v4.runtime.ProxyErrorListener.syntaxError(ProxyErrorListener.java:41) ~[antlr4-runtime-4.10.1.jar:4.10.1] at org.antlr.v4.runtime.Parser.notifyErrorListeners(Parser.java:543) ~[antlr4-runtime-4.10.1.jar:4.10.1] at org.antlr.v4.runtime.DefaultErrorStrategy.reportInputMismatch(DefaultErrorStrategy.java:327) ~[antlr4-runtime-4.10.1.jar:4.10.1] at org.antlr.v4.runtime.DefaultErrorStrategy.reportError(Defau ltErrorStrategy.java:139) ~[antlr4-runtime-4.10.1.jar:4.10.1] at org.hibernate.grammars.hql.HqlParser.statement(HqlParser.java:343) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final] at org.hibernate.query.hql.internal.StandardHqlTranslator.parseHql(StandardHqlTranslator.java:127) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final] at org.hibernate.query.hql.internal.StandardHqlTranslator.translate(StandardHqlTranslator.java:77) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final] at org.hibernate.internal.AbstractSharedSessionContract.lambda$createQuery$2(AbstractSharedSessionContract.java:747) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final] at org.hibernate.query.internal.QueryInterpretationCacheStandardImpl.createHqlInterpretation(QueryInterpretationCacheStandardImpl.java:141) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final] at org.hibernate.query.inte rnal.QueryInterpretationCacheStandardImpl.resolveHqlInterpretation(QueryInterpretationCacheStandardImpl.java:128) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final] at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:744) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final]... 69 common frames omitted

Process finished with exit code 1

Answer 1

The @Query isn't the correct SQL for calling stored proc, it doesn't like the new , try:

@Query(value=“CALL getFirstNAvailableSlots(:N,:t_start,:t_end,:cpu,:max_reservable_cpu)”, nativeQuery = true)