Hibernate 列“fulfillment_status”的类型为fulfillment_status，但表达式的类型为字符变化

Question

我在使用 hibernate 从 java 实体中的枚举更新 postgres 数据库中的枚举字段时遇到问题，导致标题中出现错误。

我的数据库看起来像这样

\dT fulfillment_status
            List of data types
 Schema |        Name        | Description 
--------+--------------------+-------------
 public | fulfillment_status | 
(1 row)

这设置特定列fulfillment_status的类型，即

       Column           |              Type              | Collation | Nullable |               Default                
----------------------------+--------------------------------+-----------+----------+--------------------------------------

fulfillment_status         | fulfillment_status             |           | not null | 

java实体类的相关章节

@Entity
@Table(name = "payments", uniqueConstraints = { @UniqueConstraint(columnNames = {"id"})})
public class Payment {
 private FulfillmentStatus fulfillmentStatus;

public enum FulfillmentStatus {
        PENDING, FULFILLED, FAILED, ABORTED
    }

@Enumerated(EnumType.STRING)
    @Column(name = "fulfillment_status", nullable = false, columnDefinition = "enum('PENDING', 'FULFILLED', 'FAILED', 'ABORTED')")
    public FulfillmentStatus getFulfillmentStatus() {
        return fulfillmentStatus;
    }

    public void setFulfillmentStatus(FulfillmentStatus fulfillmentStatus) {
        this.fulfillmentStatus = fulfillmentStatus;
    }

以及用于更新类的代码

        Session session = sessionFactory.getCurrentSession();
        session.beginTransaction();
        CriteriaBuilder builder = session.getCriteriaBuilder();
        CriteriaUpdate<Payment> update = 
        builder.createCriteriaUpdate(Payment.class);
        Root root = update.from(Payment.class);
        update.set(root.get("fulfillmentStatus"), 
        Payment.FulfillmentStatus.FULFILLED);
        update.where(builder.equal(root.get("requestID"), UUID.fromString(requestID)));
        session.createQuery(update).executeUpdate();
        session.getTransaction().commit();
        session.close();

这会产生错误

Hibernate: 
    update
        payments 
    set
        fulfillment_status=?
2018-05-02 08:54:11 WARN  SqlExceptionHelper:129 - SQL Error: 0, SQLState: 42804
2018-05-02 08:54:11 ERROR SqlExceptionHelper:131 - ERROR: column "fulfillment_status" is of type fulfillment_status but expression is of type character varying
  Hint: You will need to rewrite or cast the expression.
  Position: 40

这里的问题似乎是如何使用 CriteriaUpdate 将 java 枚举类型映射到 postgres 枚举类型......希望不需要创建额外的映射类。

Answer 1

这解决了我的问题：

@Column(name = "fulfillment_status")
@ColumnTransformer(write="?::fulfillment_status")
public FulfillmentStatus getFulfillmentStatus() {
    return fulfillmentStatus;
}