java – 如何在Spring数据neo4j中更新节点或节点实体？

在Spring数据neo44中我们只有repository.save(实体),但是例如当我的UserEntity的属性(email)发生变化时,我不知道如何更新它.

我也尝试使用neo4j模板,但保存具有现有节点ID的实体导致下面的回滚.

org.springframework.dao.InvalidDataAccessApiUsageException: New value must be a Set, was: class java.util.ArrayList; nested exception is java.lang.IllegalArgumentException: New value must be a Set, was: class java.util.ArrayList
    at org.springframework.data.neo4j.support.Neo4jExceptionTranslator.translateExceptionIfPossible(Neo4jExceptionTranslator.java:43)
    at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:58)
    at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:163)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)

我们如何更新节点或节点实体？

public void updateUserNode(UserEntity user) {  
    try{ 
    UserEntity updatedUser = this.getUserByUserId(user.getUserId());//finding node with user id///
    updatedUser.setEmail(user.getEmail());
    updatedUser.setImageId(user.getImageId());
    updatedUser.setFirstname(user.getFirstname());
    updatedUser.setLastname(user.getLastname());
    //System.out.println("Deleting ");
    //userRepository.delete(del);
    System.out.println("UPDATING ");     
    // with existing Id, you can not save it again/, or update
    updatedUser = userRepository.save(updatedUser);
    }catch(Exception e){
      e.printStackTrace();
    }
    //return 
  }

解决方法:

您必须在事务中嵌入.save().

举个例子：

final org.neo4j.graphdb.Transaction tx = this.neoTemplate.getGraphDatabaseService().beginTx();
try {
    updatedUser = userRepository.save(updatedUser);
    tx.success();
} finally {
    tx.finish();
}

标签：java,neo4j,spring-data-neo4j
来源： https://codeday.me/bug/20190620/1244946.html