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session.createQuery("Select attribute from GoodsSection tgs " + "join gs.ascendants ags join ags.attributes attribute " + "where attribute.outerId = :outerId and tgs = :section ") .setString("outerId", pOuterId) .setEntity("section", section) .setMaxResults(1) .uniqueResult(); Looks fine to me, but the result is
java.lang.IllegalStateException: No data type for node: org.hibernate.hql.ast.tree.IdentNode \-[IDENT] IdentNode: 'attribute' {originalText=attribute} at org.hibernate.hql.ast.tree.SelectClause.initializeExplicitSelectClause(SelectClause.java:145) at org.hibernate.hql.ast.HqlSqlWalker.useSelectClause(HqlSqlWalker.java:705) at org.hibernate.hql.ast.HqlSqlWalker.processQuery(HqlSqlWalker.java:529) at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:645) at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:281) at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:229) Why? What's wrong?
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The Hibernate Query Language (HQL) and Java Persistence Query Language (JPQL) are both object model focused query languages similar in nature to SQL. JPQL is a heavily-inspired-by subset of HQL. A JPQL query is always a valid HQL query, the reverse is not true however.
A person may not purchase, rent, or receive a handgun after October 1, 2013 unless they possess a valid Handgun Qualification License (HQL) issued by the Maryland State Police or qualify for exemption status.
Both HQL and JPQL are non-type-safe ways to perform query operations. Criteria queries offer a type-safe approach to querying.
HQL or Hibernate Query Language is the object-oriented query language of Hibernate Framework. HQL is very similar to SQL except that we use Objects instead of table names, that makes it more close to object oriented programming.
You haven't defined the "gs" alias. You only have "ags" and "tgs".
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