SDN 升级到 4.2.0.BUILD-SNAPSHOT 后如何获取当前的 neo4j 会话？

Question

将 Spring Data Neo4j 更新为 4.2.0.BUILD-SNAPSHOT 后出现了一些困难。特别是，我需要获取当前 Session 实例来执行一些自定义查询。我一直在使用

private Neo4jOperations getNeo4jOperations() {
    return applicationContext.getBean(Neo4jOperations.class);
}

但 Neo4jOperations 现在已弃用，所以我尝试了

private Session Neo4jSession() {
    return applicationContext.getBean(SessionFactory.class).openSession();
}

但出现异常：

org.neo4j.ogm.exception.TransactionManagerException: Transaction is not current for this thread
    org.neo4j.ogm.session.transaction.DefaultTransactionManager.rollback(DefaultTransactionManager.java:93)
    org.neo4j.ogm.transaction.AbstractTransaction.rollback(AbstractTransaction.java:67)
    org.neo4j.ogm.drivers.bolt.transaction.BoltTransaction.rollback(BoltTransaction.java:64)
    org.neo4j.ogm.transaction.AbstractTransaction.close(AbstractTransaction.java:141)
    org.springframework.data.neo4j.transaction.Neo4jTransactionManager.doCleanupAfterCompletion(Neo4jTransactionManager.java:311)
    org.springframework.transaction.support.AbstractPlatformTransactionManager.cleanupAfterCompletion(AbstractPlatformTransactionManager.java:1016)
    org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:811)
    org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:730)
    org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:487)
    org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:291)
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
    com.sun.proxy.$Proxy110.delete(Unknown Source)

那么如何获取当前会话实例呢？

Answer 1

你能试试这个吗？请注意，此配置使用的是 spring-data-neo4j 4.2.0.M1 版本，但我认为它也适用于 4.2.0.BUILD-SNAPSHOT

@Bean
public SessionFactory getSessionFactory() {
    return new SessionFactory(getConfiguration(), "com.yourbasepackage") {
    };
}

@Bean
@Scope(value = "prototype", proxyMode = ScopedProxyMode.TARGET_CLASS)
public Session getSession() throws Exception {
    return getSessionFactory().openSession();
}

同时注释您的配置 class 为：

@EnableTransactionManagement

然后你可以注入session bean并随意使用它:

@Inject
Session session;

可以看到升级到SDN 4.2完整指南here。

NOTE: Due to another issue, I've recently created a sample project on github configured correctly with this version of spring-data-neo4j. I think it could help you as a configuration sample.

希望对您有所帮助

SDN 升级到 4.2.0.BUILD-SNAPSHOT 后如何获取当前的 neo4j 会话？

How to get current neo4j session after SDN upgrade to 4.2.0.BUILD-SNAPSHOT?

session

neo4j

spring-data-neo4j

spring-data-neo4j-4

neo4j-ogm