java - 具有映射属性的实体的 Hibernate 查询

Question

我一直在努力处理 hibernate 中的查询以更新实体的状态。这种名为 PaymentRequestLink 的实体与另一个名为 extraparameters 的实体处于一对多关系

PaymentRequestType.java:

@Entity
@Table(name="payment_link")
public class PaymentRequestLink {

     private Map<String, ExtraParameter<E>> extraParameters;

     @Fetch(FetchMode.SELECT)
     @ElementCollection(fetch=FetchType.EAGER)
     @CollectionTable(name="extraparameter_payment_link", 
       schema=BaseEntity.DATABASE_SCHEMA, joinColumns=@JoinColumn(name="extraparameter_payment_link_id"))
     @MapKeyColumn(name = "name", length=64, nullable = false)
     public Map<String, ExtraParameter<String>> getExtraParameters() {
           return extraParameters;
      }

ExtraParameter.java:

 @Embeddable
 public class ExtraParameter<T extends Serializable> implements Serializable {

     //...

     @Column(name="extra_type", length=64, nullable=false)
     @NotNull
     public String getType() {
         return type;
     }

     @Column(name="extra_value", length=255, nullable=false)
     @NotNull
     public T getValue() {
         return value;
     }

这是 extraparameter_payment_link 表的数据示例:

extraparameter_payment_link_id  extra_type           extra_value          name
    1                           java.sql.Date        2019-01-01           EXPIRATION_DATE

我想做的查询是当存储在额外参数中的过期日期是当前日期之前的日期时，将 PaymentRequestLink 的状态更新为 EXPIRED。这是我现在的查询:

    String stateSentence = "AND state <> '";
    String sqlUpdateLinkDetailed =  "UPDATE PaymentRequestLink ld SET state='EXPIRED' " +
            "WHERE extraParameters.EXPIRATION_DATE.value <= ? " +
            stateSentence + PaymentRequestLinkState.PAID;

    Calendar calendar = Calendar.getInstance();
    calendar.add(Calendar.MINUTE, 1);
    Timestamp now = new Timestamp(calendar.getTimeInMillis());

    hibernateTemplate.bulkUpdate(sqlUpdateLinkDetailed, now);

我得到的异常(exception)是:

 error processing job
 org.springframework.orm.hibernate3.HibernateQueryException: could not resolve property: EXPIRATION_DATE of: component[type,value] [UPDATE 
 com.some.company.PaymentRequestLink ld SET state='EXPIRED' WHERE extraParameters.EXPIRATION_DATE.value <= ? AND state <> 'PAID']; nested exception is org.hibernate.QueryException: could not resolve property: EXPIRATION_DATE of: component[type,value] [UPDATE com.some.company.PaymentRequestLink ld SET state='EXPIRED' WHERE extraParameters.EXPIRATION_DATE.value <= ? AND state <> 'PAID']

谁能帮我解决这个问题？

Answer 1

Elements of indexed collections (arrays, lists, and maps) can be referred to by index in a where clause only:

String stateSentence = "AND state <> '";
String sqlUpdateLinkDetailed =  "UPDATE PaymentRequestLink ld SET state='EXPIRED' " +
            "WHERE extraParameters['EXPIRATION_DATE'].value <= ? " +
            stateSentence + PaymentRequestLinkState.PAID;

参见 HQL expressions documentation了解详情。