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查詢子屬性時,我面對空結果。子對象的JDO查詢集合
我的子對象如下圖所示自定義對象的列表:
家長
@PersistenceCapable
@Inheritance(customStrategy = "complete-table")
public class TimesheetRecordDaily{
...
@Persistent(embeddedElement = "true", serialized = "true", defaultFetchGroup="true")
@Element(embedded="true")
private List<TimesheetRecordDailyDetailDTO> timesheetRecordDailyDetails;
...
}
兒童
@PersistenceCapable
@EmbeddedOnly
public class TimesheetRecordDailyDetailDTO{
...
@Persistent
private String projectName;
...
}
查詢:
Query query = pm.newQuery(TimesheetRecordDaily.class);
query.setFilter("this.timesheetRecordDailyDetails.contains(prd) && prd.projectName == 'MyProject'");
query.declareVariables(TimesheetRecordDailyDetailDTO.class.getName() + " prd");
List results = (List)query.execute();
如果我改變查詢過濾器a (沒有查詢子屬性值,結果是返回
query.setFilter("this.timesheetRecordDailyDetails.contains(prd)");
任何幫助嗎?這是在GAE中運行的JDO查詢子屬性值的問題嗎?
注:我用GAE的版本是1.8.2