Question

我有像这样的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的错误

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.antlr.HqlSqlBaseWalker.fromElement（HqlSqlBaseWalker.java:3689）在org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList（HqlSqlBaseWalker.java:3567）在org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause（HqlSqlBaseWalker.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org.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.QueryTranslatorImpl.doCompile（QueryTranslatorImpl.java:206）在org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile（QueryTranslatorImpl.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.engine.query.spi.QueryPlanCache.getHQLQueryPlan（QueryPlanCache.java:167） at 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）在com.nepitc.mshandloomfrabics.controller.AuthorizationController.login（AuthorizationController.java:38）

如何正确编写

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

Hibernate - 加入

1 个答案: