无法使用 HQL 访问 JPA 加入的实体

Question

我有 2 个 ORM classes，一个名为 OpExAlloc，另一个名为 VesselManComp。

第一个与第二个不是在其主键上而是在自定义列上具有@ManyToOne 关系。

这是OpExAlloc中的代码class

@Fetch(FetchMode.JOIN)
    @JoinColumns({
            @JoinColumn(name = "companyId", referencedColumnName = "companyId",  insertable = false, updatable = false),
            @JoinColumn(name = "shipCode", referencedColumnName = "code", insertable = false, updatable = false) })
    @ManyToOne(fetch = FetchType.EAGER)
    private VesselManComp vesselManComp;

    public VesselManComp getVesselManComp() {
        return this.vesselManComp;
    }
    public void setVesselManComp(VesselManComp vesselManComp) {
        this.vesselManComp = vesselManComp;
    }

这是 HQL（它曾经在旧版本的 Hibernate 和 XML 配置中工作，而不是在注释上工作）

    String qs = " select ca.id.docId, ca.id.itemId, ca.id.shipCode, ca.account, "
            + " sum(isnull(ca.quantity, 0)) as quantity, "
            + " sum(isnull(ca.directAmtLocal,0) + isnull(ca.indirectAmtLocal,0) + isnull(ca.nationalTaxLocal,0)) as amountLocal, "
            + " sum(ca.directAmtUsd + ca.indirectAmtUsd + isnull(ca.nationalTaxUsd, 0)) as amountUSD, "
            + " min(ca.id.allocDate) as minDate, "
            + " max(ca.id.allocDate) as maxDate "
            + " from OpExAlloc"
            + " as ca "
            + " where ca.id.companyId = :companyId "
            + " and ca.id.ssId = :sourceSystemId "
            + " and ca.id.type in (:documentTypes) "
            + " and (ca.opexTypeId is null or ca.opexTypeId not in (14, 15)) "
            + " and ca.vesselManComp.code is not null ";

我得到的错误是

java.lang.IllegalArgumentException: org.hibernate.QueryException: could not resolve property: code of: com.companyname.orm.sqlserver.aether.dbo.OpExAlloc [ select ca.id.docId, ca.id.itemId, ca.id.shipCode, ca.account,  sum(isnull(ca.quantity, 0)) as quantity,  sum(isnull(ca.directAmtLocal,0) + isnull(ca.indirectAmtLocal,0) + isnull(ca.nationalTaxLocal,0)) as amountLocal,  sum(ca.directAmtUsd + ca.indirectAmtUsd + isnull(ca.nationalTaxUsd, 0)) as amountUSD,  min(ca.id.allocDate) as minDate,  max(ca.id.allocDate) as maxDate  from com.companyname.orm.sqlserver.aether.dbo.OpExAlloc as ca  where ca.id.companyId = :companyId  and ca.id.ssId = :sourceSystemId  and ca.id.type in (:documentTypes)  and (ca.opexTypeId is null or ca.opexTypeId not in (14, 15))  and ca.vesselManComp.code is not null  and ca.id.allocDate >= :allocationDateFrom  and ca.id.allocDate < :allocationDateTo  group by ca.id.docId, ca.id.itemId, ca.id.shipCode, ca.account ]
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:133)
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:157)
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:164)

奇怪的是，Hibernate 在 OpExAlloc 对象而不是 VesselManComp 对象中查找 "code" 属性。

如果我更改查询以在嵌套对象上添加连接提取

    String qs = " select ca.id.docId, ca.id.itemId, ca.id.shipCode, ca.account, "
            + " sum(isnull(ca.quantity, 0)) as quantity, "
            + " sum(isnull(ca.directAmtLocal,0) + isnull(ca.indirectAmtLocal,0) + isnull(ca.nationalTaxLocal,0)) as amountLocal, "
            + " sum(ca.directAmtUsd + ca.indirectAmtUsd + isnull(ca.nationalTaxUsd, 0)) as amountUSD, "
            + " min(ca.id.allocDate) as minDate, "
            + " max(ca.id.allocDate) as maxDate "
            + " from OpExAlloc"
            + " as ca "
            + " join fetch ca.vesselManComp vmc "
            + " where ca.id.companyId = :companyId "
            + " and ca.id.ssId = :sourceSystemId "
            + " and ca.id.type in (:documentTypes) "
            + " and (ca.opexTypeId is null or ca.opexTypeId not in (14, 15)) "
            + " and vmc.code is not null ";

我得到一个空指针异常

java.lang.NullPointerException
    at org.hibernate.hql.internal.ast.HqlSqlWalker.createFromJoinElement(HqlSqlWalker.java:424)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.joinElement(HqlSqlBaseWalker.java:3921)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3707)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3585)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:720)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:576)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:313)
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:261)
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:266)
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:189)
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:141)

有人可以解释一下我做错了什么吗？这是我们项目的迁移，旧项目使用 Hibernate 3，XML 配置 classes，查询工作正常。

新的使用 hibernate 5.2 和 classes 的注解配置。

致以诚挚的问候，谢谢，乔治

Answer 1

您的@ManyToOne 注释可能完全被忽略了。我注意到注释位于字段上。在特定 class 层次结构 (OpExAlloc class) 中使用的访问类型是什么？你能 post 整个 class 吗？默认情况下，class 层次结构的访问类型由 @Id 或 @EmbeddedId 注释的位置定义。如果这些注释在 getter 上，那么 @ManyToOne 注释也应该在 getter 上。有一个相关的 post Where to put hibernate annotations?

无法使用 HQL 访问 JPA 加入的实体

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