Question

我使用spring-data-neo4j 4.2.0.M1和neo4j-ogm 2.0.4和neo4j 3.1.0-M04。

除了我尝试保存已修改的RelationshipEntities集合的一种情况外，该应用程序通常正常工作。代码是......像这样：

List<Relationship> updatedRelationships = new ArrayList<>();
for(Relationship relationship : modifiedRelationships)
{
  relationship = relationshipRepository.load(relationship);
  relationship.setValue("value");
  updatedRelationships.add(relationship);
}
relationshipRepository.save(relationships);

RelationshipEntity使用@RelationshipEntity注释，除了@StartNode和@EndNode之外还有一些属性。但是只改变了上面提到的属性。 RelationshipEntity在循环中是load，因为我之前注意到执行此操作时丢失的信息（即其他属性的值）。注意，上面提到的代码是连续执行的许多RelationshipEntities。每个关系（可能）只发生一次，但是开始和结束节点可能会多次出现。据我所知，虽然没有删除任何关系。

我得到的例外是：

Caused by: org.neo4j.kernel.api.exceptions.EntityNotFoundException: Unable to load RELATIONSHIP with id 20683203.
at org.neo4j.kernel.impl.api.store.DiskLayer.relationshipVisit(DiskLayer.java:432)
at org.neo4j.kernel.impl.api.store.CacheLayer.relationshipVisit(CacheLayer.java:326)
at org.neo4j.kernel.impl.api.StateHandlingStatementOperations.relationshipVisit(StateHandlingStatementOperations.java:1409)
at org.neo4j.kernel.impl.api.ConstraintEnforcingEntityOperations.relationshipVisit(ConstraintEnforcingEntityOperations.java:416)
at org.neo4j.kernel.impl.api.OperationsFacade.relationshipVisit(OperationsFacade.java:493)
at org.neo4j.kernel.impl.factory.GraphDatabaseFacade.getRelationshipById(GraphDatabaseFacade.java:300)
... 104 common frames omitted

之前执行的查询（可能是＆＃34; save＆＃34;查询）很大，超出了字符限制（例如200k字符）。显然，查询涉及的位置多于必要的关系（从业务逻辑的角度来看），因为实际上只保存了大约30个实体。我假设结果查询（或查询是否按每个实体完成更新）相当简短。

2016-08-28 20:16:33,007 I [pool-4-thread-1               ] (EmbeddedRequest.java:155)     Request: START r=rel({relIds}) FOREACH (row in filter(row in {rows} where row.relId = id(r)) | SET r += row.props) RETURN ID(r) as ref, ID(r) as id, {type} as type with params {relIds=[13744338, 19099951, 12570789, 12570785, 13744377, 13648126, 12570765, 20627727, 13744356, 20627724, 12570760, 19263773, 19257628, 20113678, 19099932, 19259756, 18796874, 13783174, 19097972, 19083644, 19099970, 19097921, 19077446, 19263810, 13744312, 20568405, 20904270, 19097937, 12570827, 20627779, 20648258, 12570816, 20683195, 19259812, 20683194, 20683193, 20683192, 19083690, 20683186, 20683191, 19259819, 18819471, 20683178, 20683177, 12570669, 20683176, 19276210, 19933607, 20683171, 18844038, 19100089, 20683174, 20683173, 20683163, 20683162, 20683161, 13744242, 19257729, 12570649, 20683165, 20683164, 19087754, 21703141, 12570641, 8341711, 19259796, 8704051, 19915155, 19261851, 13783062, 13783063, 19091955, 18182597, 19276276, 19276275, 20623852, 20607468, 20623853, 19100155, 19233277, 13783048, 19261946, 12570719, 21789101, 12570718, 19075526, 19259842, 19257807, 12570707, 13715516, 19098061, 19261908, 20683208, 20683215, 19100118, 20683212, 20683203, 19276254, 20683201, 20683207, 19091934, 20683206, 19261915, 19097639, 19101736, 19101749, 18821129, 19097659, 19124284, 13662709, 13744628, 19052549, 19089427, 13744612, 19265563, 19251300, 19089509, 19251298, 20631665, 19251305, 19265642, 13744513, 19261558, 19261511, 19265606, 19081291, 18903113, 18903114, 19251273, 8341775, 12597685, 13744548, 19081308, 18725021, 18725020, 19273892, 19099808, 19089572, 19097772, 13744449, 13683011, 18178177, 19273905, 19093694, 18178231, 19124358, 20633756, 13744502, 19081356, 18651311, 19093661, 20562171, 19263725, 20625639, 19099901, 20631774, 20676819, 18651383, 20676822, 20676821, 20676820, 19097811, 19099862, 13744428, 20631751, 18178280, 18668312, 19100453, 19088171, 20708148, 19143487, 19088184, 19094334, 18668349, 13744883, 19145485, 20607750, 19094301, 19086108, 13744792, 20611958, 19143528, 13662849, 13744829, 12571346, 20611918, 20611919, 18811753, 19100506, 13744813, 19084195, 13662806, 20708275, 19098546, 20612001, 13744752, 20708253, 12595823, 20611976, 19147673, 19258343, 19274725, 19084262, 19082212, 19096548, 20591606, 19086317, 13662720, 8348332, 19274738, 8348329, 19096571, 21703569, 19440630, 13744654, 21824427, 13744701, 19258320, 20612032, 19086296, 19080158, 19282466, 19145249, 19261996, 20607539, 12596170, 19282472, 18776588, 19100208, 12596183, 18182658, 19233341, 19278395, 19096126, 19098115, 20640284, 18844217, 19255810, 19259919, 19257864, 20623892, 19091980, 19933697, 19282450, 19100180, 19261981, 12596219, 12596113, 19255924, 20707949, 12596118, 19098228, 18704970, 12596122, 19278458, 19096190, 19278456, 19253826, 19278412, 13745087, 19100241, 13745066, 18704995, 19278500, 13744981, 5954519, 19094199, 19143356, 13744970, 12598116, 18840242, 13745006, 18676445, 18008789, 19096298, 18676426, 20607724, 13744906, 13755199, 19094227, 12596419, 19098918, 19256621, 19090736, 21075287, 19100929, 21851496, 20876568, 13681912, 12596463, 12596465, 19090704, 10951825, 12596471, 13681897, 13753581, 19094814, 12596352, 21703948, 21695756, 18699605, 19256693, 18818378, 12596376, 19090755, 19256647, 13681844, 19082583, 18836839, 18699621, 12596409, 20618681, 21544395, 19916202, 12596299, 12596310, 19436940, 19099014, 19094918, 19916170, 13681782, 12596335, 20680073, 13681762, 13681763, 19099028, 19094938, 21081473, 13681682, 20680177, 12596242, 19099126, 19500540, 21081496, 10492993, 19099087, 21081517, 19099094, 21704112, 19098665, 18680849, 12596685, 12596689, 19274804, 20648995, 19137597, 21048411, 19088387, 19262470, 20657183, 19086357, 19258397, 18680869, 12596731, 19088413, 19272807, 19274848, 19272811, 12596622, 18811984, 15797667, 19096694, 19082357, 19262579, 19274875, 19137604, 12596642, 19274830, 19098696, 13682107, 12596651, 19096655, 20632650, 19088474, 19274845, 19262555, 19100834, 13682007, 19098794, 19100851, 12596565, 20556972, 19254450, 20597926, 12598622, 20597925, 20649114, 19100800, 13682036, 19100806, 12596582, 18703539, 20638856, 20598010, 18703582, 19094763, 19100905, 19096808, 20634857, 20597991, 5877179, 5877178, 20597977, 5877181, 19098822, 12596527, 12596532, 19199781, 19265313, 19261228, 20625200, 19257134, 20625201, 18714376, 19085108, 19253054, 19253048, 19265339, 20637459, 20637456, 19085074, 21081974, 8316482, 20598534, 18714402, 19107685, 19253090, 20615029, 19097462, 19263346, 20621152, 19263352, 19259207, 13729470, 19085140, 20688830, 19251116, 19259304, 13678173, 20615087, 12596830, 19097474, 21082087, 12596840, 19263368, 19251093, 8701488, 19267475, 8349384, 12572165, 8349360, 12596751, 19077119, 12596765, 20625380, 19077057, 19089350, 21825447, 21702567, 13682208, 12596785, 8316559, 18178020, 19253207, 20688847, 12596788, 19267536, 20688838, 12570558, 19232295, 12570550, 13783001, 20643352, 20694547, 19095051, 20643338, 19232272, 12570505, 20641280, 20694529, 20641284, 19099164, 20821624, 20821626, 20631165, 20821619, 12570606, 19439229, 12570601, 18820674, 19232327, 12570588, 20694621, 20641362, 20119134, 20631115, 20680264, 20618831, 19093080, 18824862, 19256994, 7325670, 20821668, 19257017, 13782863, 16494427, 20620952, 19256967, 20637331, 18030271, 8267731, 19256977, 20670095, 19099360, 20637433, 19261170, 19265276, 20907749, 18822910, 20621021, 19099339, 19252938, 19936961, 19099345, 19109599, 19257048], rows=[omitted]

我试图直接加载与该ID的关系，但都不存在。相同的代码对其他RelationshipEntities执行正常，但对于这个或其中一些其他的一个，反复失败。关于什么可能导致这个或如何更好地调试的任何想法？

Answer 1

我认为以某种方式通过以下步骤解决了这个问题：

替换保存RelationshipEntity并保存已修改的NodeEntity
按顺序进行此类修改操作（之前可以并行执行）
在事务中封装修改操作
修正了同一事务中同一实体被保存两次的错误（同时没有再次更改）
在交易开始时再次获取实体以获得最新状态

由于我对这个话题一直很不满意，直到它最终起作用，我不确定所有步骤是否真的有助于解决这个问题。它实际上可能只是一个子集。我现在看到的是，巨大的更新查询现在变小了（尽管仍然很大）但实际上似乎包含了真实的＃34;更新而不是主要＆＃34; null＆＃34;属性。我假设之前它并没有真正包含更新，而是使用＆＃34; null＆＃34;覆盖属性。这个现在正在发挥作用的事实可能与这样一个事实有关：实体现在在开始修改之前已经更新，并且没有其他修改操作可以并行运行。

Answer 2

我遇到了同样的问题。对我来说，这只是neo4j-ogm嵌入式驱动程序版本我必须包含在我的pom中。我定义的那个覆盖了一个在spring-data-neo4j中定义。

Answer 3

如果您只保存relationshipEntity，则只能使用下一个代码段：

List<Relationship> updatedRelationships = new ArrayList<>();
for(Relationship relationship : modifiedRelationships)
{
  relationship = relationshipRepository.load(relationship);
  relationship.setValue("value");
  updatedRelationships.add(relationship);
}
relationshipRepository.save(updatedRelationships,0);

它将保存relationshipEntity上的相关属性，同时忽略任何相关实体。

＆＃34; EntityNotFoundException：无法加载带有id＆＃34的RELATIONSHIP;保存RelationshipEntity时（使用巨大的生成的密码查询）

3 个答案: