sql - hibernate 4.3.6 QuerySyntaxException : Path expected for join

Question

HQL 连接查询有问题。谁能告诉我下面的 join HQL 查询有什么问题？
正在使用 Hibernate 4.3.6、JDK 7 和 Groovy 2.2

def query = 'select lip.referenceId from Parcel as lip left join TransportFile tf where lip.statusDisplayName != tf.statusDisplayName'
def hqlQuery = session.createQuery(query)
def hqlcount = hqlQuery.list().size

当我运行上面的代码时出现以下错误

com.dc.core.common.exception.BaseApplicationException: org.hibernate.hql.internal.ast.QuerySyntaxException: Path expected for join! [select lip.referenceId from com.dc.apps.cp.ebilling.model.impl.Parcel as lip left join TransportFile tf where lip.statusDisplayName != tf.statusDisplayName]

下面是我的包裹实体

package com.dc.apps.cp.ebilling.model.impl
@Entity
@Audited
public class Parcel implements IPersistentEntityInstance {

private static final long                  serialVersionUID = 1L;
private Long                               id;
@AttributeReadPermission(name = "SUBMITTEDFILE.READ")
@AttributeWritePermission(name = "SUBMITTEDFILE.UPDATE")
private File                               submittedFile;
private ParcelType                  type;
private boolean                            isBeingSubmitted;
private TransportFile              transportFile;
}

下面是我的 TransportFile 实体

package com.dc.apps.cp.legacy.model.impl;
@Entity
@EntityMetadataDefaults(editable = false)
public class TransportFile implements ITransportObject {

private static final long          serialVersionUID = 1L;    
private Long                       id;
private String                     statusDisplayName;    
// [ReferenceID] [varchar](30) NOT NULL
private String                     referenceId;
// [sent] [datetime] NULL,
private Timestamp                  sentDate;
// [received] [datetime] NULL,
private Timestamp                  receivedDate;
// [Status] [varchar](4) NULL,
private String                     statusCode;
private List<TransportLog> TransportLogs;    
private String                     rejectionReason;
}

我引用了这个帖子 HQL left join: Path expected for join但我没有看到任何我的 HQL 连接查询。

Answer 1

这个异常(exception)“预期加入的路径”是说:

Provide a path from one entity, to the other. The join is defined by the mapping

所以我们需要:

select lip.referenceId 
   from Parcel as lip 
   // instead of this
   // left join TransportFile tf 
   // we need a path from Parcel to TransportFile
   left join lip.transportFile tf 
   where lip.statusDisplayName != tf.statusDisplayName'
   ...

声明 left join TransportFile tf更像是 SQL ...... HQL 并非如此。

我们的声明必须是表达导航: left join lip.transportFile tf - 即加入 transportFile与 lip 相关.