Hibernate - 加入的路径

Question

我有这样的hibernate查询

SELECT t FROM User t JOIN UserRole u ON t.username = u.username WHERE t.username=:username AND t.password =:pass AND u.userRole =:ust

但是这个查询不起作用Error

错误：加入的路径！错误：加入的路径！加入的路径！在org.hibernate.hql.internal.ast.HqlSqlWalker.createFromJoinElement（HqlSqlWalker.java:385）在org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.joinElement（HqlSqlBaseWalker.java:3903）在org.hibernate.hql.internal org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause上的org.hibernate.hql.internal.antlr.HqlSaseWalker.fromElementList（HqlSqlBaseWalker.java:3567）中的.antlr.HqlSqlBaseWalker.fromElement（HqlSqlBaseWalker.java:3689）（HqlSqlBaseWalker）的.java：708）在org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query（HqlSqlBaseWalker.java:564）在org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement（HqlSqlBaseWalker.java:301）在有机hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement（HqlSqlBaseWalker.java:249）在org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze（QueryTranslatorImpl.java:278）在org.hibernate.hql.internal.ast。在org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile（QueryTranslato）的QueryTranslatorImpl.doCompile（QueryTranslatorImpl.java:206） rImpl.java:158）在org.hibernate.engine.query.spi.HQLQueryPlan。（HQLQueryPlan.java:131）在org.hibernate.engine.query.spi.HQLQueryPlan。（HQLQueryPlan.java:93）在org.hibernate作为.engine.query.spi.QueryPlanCache.getHQLQueryPlan（QueryPlanCache.java:167）在org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan（AbstractSessionImpl.java:301）在org.hibernate.internal.AbstractSessionImpl.createQuery（AbstractSessionImpl.java:236 ）在org.hibernate.internal.SessionImpl.createQuery（SessionImpl.java:1836）在com.nepitc.mshandloomfrabics.daoimp.UserDAOImp.login（UserDAOImp.java:40）在com.nepitc.mshandloomfrabics.service.UserService.login（ UserService.java:74）at com.nepitc.mshandloomfrabics.controller.AuthorizationController.login（AuthorizationController.java:38）

我该怎么写得正确

Answer 1

在JPQL / HQL中，您不需要为连接指定ON子句，因为Hibernate已经知道两个实体之间的映射以及生成所述连接所需的列。

所以你真的只需要提供谓词和执行连接的请求，如下所示

SELECT u FROM User u 
  JOIN u.roles ur
 WHERE u.username = :username
   AND u.password = :password
   AND ur.userRole = :role