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This is my HQL query, but it isn't working and is throwing an error.
Hql query:
SELECT
*
FROM
TABLEA A
LEFT JOIN
A.TABLEB B
WHERE
A.COLUMNNAME = B.COLUMNAME
and it causes this error:
org.hibernate.QueryException:
This Query caught Exception. could not resolve property: of TABLEB:TABLEA.
How can I solve this problem? Actually I retrieved a value from more than one table. This query doesn't work with CreateQuery(strQuery).
605
select * from A as a left join B as b on a.id = b.id left join C as c on b. type=c. type; Need help in writing equivalent HQL.
Some of the commonly supported clauses in HQL are: HQL From: HQL From is same as select clause in SQL, from Employee is same as select * from Employee . We can also create alias such as from Employee emp or from Employee as emp . HQL Join : HQL supports inner join, left outer join, right outer join and full join.
JOIN FETCH (or LEFT JOIN FETCH ) will collect all the associations along with their owner object. Meaning that the collection will be retrieved in the same select. This can be shown by enabling Hibernate's statistics. A (left/outer) join fetch is great for *ToOne (many-to-one or one-to-one) associations.
In HQL you can use LEFT JOIN only with linked property in main entity:
Sample
EntityA has an object entityB of type EntityB so you can
SELECT A FROM EntityA A LEFT JOIN A.entityB B WHERE ...
IF EntityA haven't entityB property but is EntityB have a property entityA, you can't write this:
SELECT A FROM EntityA LEFT JOIN EntityB B WHERE B.entityA = A
because you have an error. This is an Hibernate issue not resolved yet.
64
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