Question

您好我有一个使用Spring + Spring Data + Datanucleus（JPA）在GAE上运行的应用程序，我需要按日期和枚举查询实体。我有一些测试用例和本地工作正常，也在我的本地运行开发服务器我得到了预期的结果。当我在GAE中部署相同的应用程序时，特定查询会抛出异常。

查询如下所示。

@Query("select campaign from Campaign campaign where campaign.scheduleDate is not null and campaign.scheduleDate > ?1 and campaign.status in ('CREATED')")
List<Campaign> scheduledPendingToStart(final Date fromDate);

我也尝试过：

@Query("select campaign from Campaign campaign where campaign.scheduleDate is not null and campaign.scheduleDate > ?1 and campaign.status in (?2)")
List<Campaign> scheduledPendingToStart(final Date fromDate, final Collection<CampaignStatus> status);

我修改了查询以查看是否可以找到问题，并且似乎比较了日期和不等式运算符＆＃34;＆gt;＆＃34;是有问题的。如果我使用相等运算符＆＃34; =＆＃34;查询运行正常但当然我没有得到预期的结果。

Campaign实体定义如下：

@Entity
public class Campaign extends BaseEntity implements Serializable {

@Basic
private String name;

@Column(nullable = true)
@Temporal(TemporalType.TIMESTAMP)
private Date scheduleDate;

@Enumerated(EnumType.STRING)
private CampaignStatus status;
...
...
}

我用于Spring，Datanucleus和AppEngine的版本：

spring.version＆gt; 3.2.2.RELEASE
spring.data.jpa.version＆gt; 1.3.5.RELEASE
datanucleus.version＆gt; 3.1.4
appengine.sdk.version＆gt; 1.7.5
appengine.datanucleus.version＆gt; 2.1.2

有什么想法吗？

更新：我一直在测试不同的查询，最后我得出的结论是，不可能在实体的不同属性上混合使用不等式和等式运算符。我的测试是：

WORKS

@Query("select campaign from Campaign campaign where campaign.scheduleDate is not null and campaign.scheduleDate > ?1")
List<Campaign> scheduledPendingToStart(final Date fromDate);

WORKS

@Query("select campaign from Campaign campaign where campaign.status in ('CREATED')")
List<Campaign> scheduledPendingToStart();

WORKS

@Query("select campaign from Campaign campaign where campaign.status = 'CREATED'")
List<Campaign> scheduledPendingToStart();

DOESN＆＃39; WORK

@Query("select campaign from Campaign campaign where campaign.scheduleDate is not null and campaign.scheduleDate > ?1 and campaign.status in ('CREATED')")
List<Campaign> scheduledPendingToStart(final Date fromDate);

DOESN＆＃39; WORK

@Query("select campaign from Campaign campaign where campaign.scheduleDate is not null and campaign.scheduleDate > ?1 and campaign.status = 'CREATED'")
List<Campaign> scheduledPendingToStart(final Date fromDate);

Answer 1

如果您为计划日期执行＆gt;？1，则无论如何都不应该抓取空值，因此您不需要我想到的两个。

另一种方法是只做一个“status ='CREATED'”，然后按日期排序，确保你跳过你不想要的记录（当然不是最佳的）。

通常，应用引擎数据存储区应该支持不同属性上的不等式和相等性......它不允许在多个属性上使用多个不等式过滤器，如here所述。你能复制你收到的例外吗？

Spring Data + Datanucleus + JPA按日期查询

1 个答案: