我正在使用OrientDB 2.1.6 Object API。OrientDB:删除使用Object API创建的记录和引用
我有两个的POJO与这样的1到N的关系:
public static class Results {
private String userId;
private String templateId;
private Double totalLength;
private List<String> visibleFields;
private Boolean filterable;
@OneToMany(orphanRemoval = true)
private List<ResultItem> items;
//Generic getters and setters
}
public static class ResultItem {
private String id;
private String vsId;
private String entryTemplateId;
private String objectType;
private String objectTypeLabel;
private String capabilityComment;
private Boolean currentVersion;
private Double contentSize;
private String name;
private String objectStoreId;
private String mimeType;
private HashMap<String, String> attributes;
private Date dateLastModified;
//generic getters and setters
}
这OrientDB创建两个类。如果我使用Object API删除了一个Results实例,它将正确删除关联的ResultItem行。
我想删除使用“控制台”这样的特定ResultItem记录:
orientdb {db=test}> find references #15:6392 Found
[{rid:#15:6392,referredBy:[1]}] in 0.014000 sec(s).
orientdb {db=test}> delete from ResultItem where @rid=#15:6392 Delete
record(s) '1' in 0.006000 sec(s).
orientdb {db=test}> find references #15:6392 Found
[{rid:#15:6392,referredBy:[1]}] in 0.014000 sec(s).
控制台输出表明记录已被删除,但它仍然包含一个“参考”。
当我回到Object api并尝试db.detachAll(results,true)时,这会体现为一个问题。它抛出了这个我认为是由于孤儿关系造成的异常。
Caused by: java.lang.NullPointerException
at com.orientechnologies.orient.object.db.OObjectLazyList.convertAndDetachAll(OObjectLazyList.java:456)
at com.orientechnologies.orient.object.db.OObjectLazyList.convertAndDetachAll(OObjectLazyList.java:432)
at com.orientechnologies.orient.object.db.OObjectLazyList.detachAll(OObjectLazyList.java:424)
at com.orientechnologies.orient.object.enhancement.OObjectProxyMethodHandler.detachAll(OObjectProxyMethodHandler.java:165)
at com.orientechnologies.orient.object.enhancement.OObjectEntitySerializer.detachAll(OObjectEntitySerializer.java:261)
at com.orientechnologies.orient.object.db.OObjectDatabaseTx.detachAll(OObjectDatabaseTx.java:809)
at com.orientechnologies.orient.object.db.OObjectDatabaseTx.detachAll(OObjectDatabaseTx.java:327)
如何删除与记录一起的关系?
嗨弗雷德里克,你有一个小的数据库测试或整个Java代码来尝试你的情况? – LucaS
不是。但是,我已经在描述中粘贴了两个POJO,以及在删除记录后显示残留引用的控制台命令。可以通过实例化结果POJO和测试数据并使用Object api保存结果对象来重现。 –