java - 如果列为空，SQLResultSetMapping将引发异常

我有一个要映射其本机查询结果集的值对象。
我正在使用@SQLResultSetMapping映射对象字段，但是当任何列的值是null时，都会引发异常：

Exception [EclipseLink-6177] (Eclipse Persistence Services - 2.6.1.v20150916-55dc7c3): org.eclipse.persistence.exceptions.QueryException
Exception Description: The column result [custom_properties] was not found in the results of the query.

我的实体类和映射

@Entity
@Multitenant(MultitenantType.TABLE_PER_TENANT)
@Table(name = "account_master")
@SqlResultSetMapping(name = "DTO_MAPPING", classes = @ConstructorResult(
    targetClass = AccountDTO.class,
    columns = {@ColumnResult(name = "id"),
        @ColumnResult(name = "name"),
        @ColumnResult(name = "custom_properties")
    })
)
public class Account implements Serializable {
// fields, setters and getters

}

值对象：

public class AccountDTO {

  public AssetDTO(){
  }

  public AssetDTO(int id, String name, String customProperties) {
    this.id = id;
    this.name = name;
    this.customProperties = customProperties;
  }

}

和执行语句

List<AccountDTO> accList = entityManager.createNativeQuery("SELECT id, name, custom_properties FROM account_master WHERE acc_hierarchy <@ 2.3", "DTO_MAPPING").getResultList()

如果将custom_properties（可为空）替换为查询中的静态值，则映射可以正常工作。实施有问题吗？由于映射空值似乎是一种常见情况。

最佳答案

这是作为EclipseLink中的错误提交的：https://bugs.eclipse.org/bugs/show_bug.cgi?id=484276

解决方法是，您可以在


  @ColumnResult


注解。

因此，您应该将代码更改为：

@Entity
@Multitenant(MultitenantType.TABLE_PER_TENANT)
@Table(name = "account_master")
@SqlResultSetMapping(name = "DTO_MAPPING", classes = @ConstructorResult(
    targetClass = AccountDTO.class,
    columns = {@ColumnResult(name = "id"),
        @ColumnResult(name = "name"),
        @ColumnResult(name = "custom_properties", type=String.class)
    })
)
public class Account implements Serializable {
// fields, setters and getters

}

关于java - 如果列为空，SQLResultSetMapping将引发异常，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/41549440/