JPA + Hibernate + Native Query + custom list of dtos from the resultset

Question

Hi,

My native query below is working fine oracle sqlplus. But through JPA native query, giving following error:

[ERROR] org.hibernate.util.JDBCExceptionReporter - ORA-00923: FROM keyword not found where expected

Native Query

SELECT sch.school_name, term.term_name, count(material.MATERIAL_ID), sip.SIP_COUNT, ... FROM VA_SCHOOL sch  JOIN va_user_school_rel usr1 on sch.school_id=usr1.school_id  

JOIN va_user ur ON usr1.USER_ID= ur.USER_ID  
JOIN va_user_role_rel urr1 on usr1.user_id=urr1.user_id  
JOIN va_role rle ON urr1.role_id= rle.role_id  
JOIN va_user_school_rel usr2 on sch.school_id=usr2.school_id   
JOIN va_user ur1 ON usr2.USER_ID= ur1.USER_ID  
JOIN va_user_role_rel urr2 on usr2.user_id=urr2.user_id  
JOIN va_role rle1 ON urr2.role_id= rle1.role_id  
JOIN va_term term on term.school_id = usr1.school_id  
JOIN va_class course on course.term_id = term.term_id  
JOIN va_material material on material.class_id = course.class_id  
LEFT JOIN (SELECT VA_CLASS.TERM_ID TERM_ID, COUNT(*) as SIP_COUNT FROM VA_CLASS JOIN VA_MATERIAL ON VA_MATERIAL.CLASS_ID = VA_CLASS.CLASS_ID  WHERE VA_CLASS.reference_flag = 'A' AND trunc(VA_MATERIAL.SCHOOL_STATUS) = 0  GROUP BY VA_CLASS.TERM_ID) sip on term.term_id = sip.term_id

WHERE course.reference_flag = 'A' AND rle.role_name='ROLE_1' AND rle1.role_name='ROLE_2'  

GROUP BY sch.school_name, term.term_name, sip.SIP_COUNT
ORDER BY sch.school_name, term.term_name

JPA Native Query:

SELECT new MyDTO(sch.school_name, term.term_name, count(material.MATERIAL_ID), sip.SIP_COUNT, ...) FROM VA_SCHOOL sch  
JOIN va_user_school_rel usr1 on sch.school_id=usr1.school_id  
JOIN va_user ur ON usr1.USER_ID= ur.USER_ID  
JOIN va_user_role_rel urr1 on usr1.user_id=urr1.user_id  
JOIN va_role rle ON urr1.role_id= rle.role_id  
JOIN va_user_school_rel usr2 on sch.school_id=usr2.school_id   
JOIN va_user ur1 ON usr2.USER_ID= ur1.USER_ID  
JOIN va_user_role_rel urr2 on usr2.user_id=urr2.user_id  
JOIN va_role rle1 ON urr2.role_id= rle1.role_id  
JOIN va_term term on term.school_id = usr1.school_id  
JOIN va_class course on course.term_id = term.term_id  
JOIN va_material material on material.class_id = course.class_id  

LEFT JOIN (SELECT VA_CLASS.TERM_ID TERM_ID, COUNT(*) as SIP_COUNT FROM VA_CLASS JOIN VA_MATERIAL ON VA_MATERIAL.CLASS_ID = VA_CLASS.CLASS_ID  WHERE VA_CLASS.reference_flag = 'A' AND trunc(VA_MATERIAL.SCHOOL_STATUS) = 0  GROUP BY VA_CLASS.TERM_ID) sip on term.term_id = sip.term_id  

WHERE course.reference_flag = 'A' AND rle.role_name=:p_roleName AND rle1.role_name=:p_roleName1  

GROUP BY sch.school_name, term.term_name, sip.SIP_COUNT 
ORDER BY sch.school_name, term.term_name

Answer 1

Take a look at the answer to this question. Verify that the validation query is something like SELECT 1 FROM DUAL;

Answer 2

JPA native query will not transform resultset into list of supplied type of DTO :(. We need to do explicitly.

Thanks,
Srihari