Neo4j时间树REST API上一次和下一次导航
我目前正在使用Neo4j TimeTree REST API,是否有任何方法可以导航到给定时间戳前后的时间?我的决心是秒,我只是意识到,如果一分钟发生了变化,那么就没有“下一秒”关系将前一分钟的前一秒连接到当前的第二秒。这使得cypher查询变得相当复杂,如果它已经可用,我不想再重新发明轮子。 提前感谢,我们将非常感谢您的回复 编辑 我必须再次重现缺失的下一个关系问题,如下图所示。这从我第三次添加新的第二时间瞬间开始发生 我实际上创建了一个NodeEntity来处理第二个节点。这门课如下所示Neo4j时间树REST API上一次和下一次导航,neo4j,graph-databases,spring-data-neo4j-4,graphaware,Neo4j,Graph Databases,Spring Data Neo4j 4,Graphaware,我目前正在使用Neo4j TimeTree REST API,是否有任何方法可以导航到给定时间戳前后的时间?我的决心是秒,我只是意识到,如果一分钟发生了变化,那么就没有“下一秒”关系将前一分钟的前一秒连接到当前的第二秒。这使得cypher查询变得相当复杂,如果它已经可用,我不想再重新发明轮子。 提前感谢,我们将非常感谢您的回复 编辑 我必须再次重现缺失的下一个关系问题,如下图所示。这从我第三次添加新的第二时间瞬间开始发生 我实际上创建了一个NodeEntity来处理第二个节点。这门课如下所示
@NodeEntity(label = "Second")
public class TimeTreeSecond {
@GraphId
private Long id;
private Integer value;
@Relationship(type = "CREATED_ON", direction = Relationship.INCOMING)
private FilterVersionChange relatedFilterVersionChange;
@Relationship(type = "NEXT", direction = Relationship.OUTGOING)
private TimeTreeSecond nextTimeTreeSecond;
@Relationship(type = "NEXT", direction = Relationship.INCOMING)
private TimeTreeSecond prevTimeTreeSecond;
public TimeTreeSecond() {
}
public Long getId() {
return id;
}
public void next(TimeTreeSecond nextTimeTreeSecond) {
this.nextTimeTreeSecond = nextTimeTreeSecond;
}
public FilterVersionChange getRelatedFilterVersionChange() {
return relatedFilterVersionChange;
}
}
这里的问题是即将到来的下一个关系。当我忽略这一点时,一切正常。
有时,当我以短延迟重复创建时间瞬间时,我的控制台中甚至会出现这种异常
Exception in thread "main" org.neo4j.ogm.session.result.ResultProcessingException: Could not initialise response
at org.neo4j.ogm.session.response.GraphModelResponse.<init>(GraphModelResponse.java:38)
at org.neo4j.ogm.session.request.SessionRequestHandler.execute(SessionRequestHandler.java:55)
at org.neo4j.ogm.session.Neo4jSession.load(Neo4jSession.java:108)
at org.neo4j.ogm.session.Neo4jSession.load(Neo4jSession.java:100)
at org.springframework.data.neo4j.repository.GraphRepositoryImpl.findOne(GraphRepositoryImpl.java:50)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:452)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:437)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:409)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at com.sun.proxy.$Proxy32.findOne(Unknown Source)
at de.rwthaachen.service.core.FilterDefinitionServiceImpl.createNewFilterVersionChange(FilterDefinitionServiceImpl.java:100)
at sampleapp.FilterLauncher.main(FilterLauncher.java:50)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
Caused by: org.neo4j.ogm.session.result.ResultProcessingException: "errors":[{"code":"Neo.ClientError.Statement.InvalidType","message":"Expected a numeric value for empty iterator, but got null"}]}
at org.neo4j.ogm.session.response.JsonResponse.parseErrors(JsonResponse.java:128)
at org.neo4j.ogm.session.response.JsonResponse.parseColumns(JsonResponse.java:102)
at org.neo4j.ogm.session.response.JsonResponse.initialiseScan(JsonResponse.java:46)
at org.neo4j.ogm.session.response.GraphModelResponse.initialiseScan(GraphModelResponse.java:66)
at org.neo4j.ogm.session.response.GraphModelResponse.<init>(GraphModelResponse.java:36)
... 27 more
2015-05-23 01:30:46,204 INFO ork.data.neo4j.config.Neo4jConfiguration: 62 - Intercepted exception
线程“main”org.neo4j.ogm.session.result.ResultProcessingException中的异常:无法初始化响应
在org.neo4j.ogm.session.response.GraphModelResponse上(GraphModelResponse.java:38)
位于org.neo4j.ogm.session.request.SessionRequestHandler.execute(SessionRequestHandler.java:55)
位于org.neo4j.ogm.session.Neo4jSession.load(Neo4jSession.java:108)
位于org.neo4j.ogm.session.Neo4jSession.load(Neo4jSession.java:100)
位于org.springframework.data.neo4j.repository.graphrespositoryimpl.findOne(graphrespositoryimpl.java:50)
在sun.reflect.NativeMethodAccessorImpl.invoke0(本机方法)处
在sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)中
在sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)中
位于java.lang.reflect.Method.invoke(Method.java:606)
位于org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:452)
位于org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:437)
位于org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:409)
在org.springframework.aop.framework.ReflectiveMethodInvocation.procedue(ReflectiveMethodInvocation.java:179)上
位于org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
位于org.springframework.transaction.interceptor.TransactionSpectSupport.invokeWithinTransaction(TransactionSpectSupport.java:281)
位于org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
在org.springframework.aop.framework.ReflectiveMethodInvocation.procedue(ReflectiveMethodInvocation.java:179)上
位于org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
在org.springframework.aop.framework.ReflectiveMethodInvocation.procedue(ReflectiveMethodInvocation.java:179)上
位于org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
位于com.sun.proxy.$Proxy32.findOne(未知源)
位于de.rwthaachen.service.core.FilterDefinitionServiceImpl.CreateNewFilterServersOnChange(FilterDefinitionServiceImpl.java:100)
位于sampleapp.FilterLauncher.main(FilterLauncher.java:50)
在sun.reflect.NativeMethodAccessorImpl.invoke0(本机方法)处
在sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)中
在sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)中
位于java.lang.reflect.Method.invoke(Method.java:606)
位于com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)
原因:org.neo4j.ogm.session.result.ResultProcessingException:“错误”[{“代码”:“Neo.ClientError.Statement.InvalidType”,“消息”:“需要空迭代器的数值,但得到null”}]}
位于org.neo4j.ogm.session.response.JsonResponse.parseErrors(JsonResponse.java:128)
位于org.neo4j.ogm.session.response.JsonResponse.parseColumns(JsonResponse.java:102)
位于org.neo4j.ogm.session.response.JsonResponse.initialiseScan(JsonResponse.java:46)
在org.neo4j.ogm.session.response.GraphModelResponse.initialiseScan上(GraphModelResponse.java:66)
在org.neo4j.ogm.session.response.GraphModelResponse上(GraphModelResponse.java:36)
... 还有27个
2015-05-23 01:30:46204信息ork.data.neo4j.config.NEO4JC配置:62-截获异常
下面是我用来创建时间瞬间节点的一个REST调用示例:
我用于创建数据的方法:
public FilterVersionChange createNewFilterVersionChange(String projectName,
String filterVersionName,
String filterVersionChangeDescription,
Set<FilterState> filterStates)
{
Long filterVersionNodeId = filterVersionRepository.findFilterVersionByName(projectName, filterVersionName);
FilterVersion newFilterVersion = filterVersionRepository.findOne(filterVersionNodeId, 2);
// Populate all the existing filters in the current project
Map<String, Filter> existingFilters = new HashMap<String, Filter>();
try
{
for(Filter filter : newFilterVersion.getProject().getFilters())
{
existingFilters.put(filter.getMatchingString(), filter);
}
}
catch(Exception e) {}
// Map the filter states to the populated filters, if any. Otherwise, create new filter for it.
for(FilterState filterState : filterStates)
{
Filter filter = existingFilters.get(filterState.getMatchingString());
if(filter == null)
{
filter = new Filter(filterState.getMatchingString(), filterState.getMatchingType(), newFilterVersion.getProject());
}
filterState.stateOf(filter);
}
Long now = System.currentTimeMillis();
TimeTreeSecond timeInstantNode = timeTreeSecondRepository.findOne(timeTreeService.getFilterTimeInstantNodeId(projectName, now));
FilterVersionChange filterVersionChange = new FilterVersionChange(filterVersionChangeDescription, now, filterStates, filterStates, newFilterVersion, timeInstantNode);
FilterVersionChange addedFilterVersionChange = filterVersionChangeRepository.save(filterVersionChange);
return addedFilterVersionChange;
}
public FilterVersionChange createNewFilterVersionChange(字符串projectName,
字符串filterVersionName,
字符串filterVersionChangeDescription,
设置过滤器(状态)
{
Long filterVersionNodeId=filterVersionRepository.findFilterVersionByName(项目名称,filterVersionName);
FilterVersion newFilterVersion=filterVersionRepository.findOne(filterVersionNodeId,2);
//填充当前项目中的所有现有过滤器
Map existingFilters=new HashMap();
尝试
{
对于(筛选器筛选器:newFilterVersion.getProject().getFilters())
{
existingFilters.put(filter.getMatchingString(),filter);
}
}
捕获(例外e){}
//将筛选器状态映射到已填充的筛选器(如果有)。否则,为其创建新筛选器。
用于(过滤器状态过滤器状态:过滤器状态)
{
过滤器过滤器=现有过滤器
(post:Post)-[:NEXT]->(post:Post)
class Post {
@Relationship(type="NEXT", direction=Relationship.OUTGOING)
Post next;
@Relationship(type="NEXT", direction=Relationship.INCOMING)
Post previous;
}
class Post {
Post next;
@Transient Post previous;
@Relationship(type="NEXT", direction=Relationship.OUTGOING)
public void setNext(Post next) {
this.next = next;
if (next != null) {
next.previous = this;
}
}
}
findOne(post.getId(), -1);