节点和关系的 Neo4j 导入

Question

嗨，我一直在尝试建立一个类似于社交网络的图形数据库，我的问题是我可以从一个名为 Messages.csv 的 csv 文件创建节点，然后使用 Messages.csv?

这是我创建用户的第一个导入语句：

USING PERIODIC COMMIT
LOAD CSV FROM 'file:/Users/Oliver/Desktop/Assessment_CSV/Assessment_table_Users.csv' AS csvLineB
CREATE (n:Users {
  UserID: csvLineB[0],
  Firstname: csvLineB[1],
  Surname: csvLineB[2],
  DOB: csvLineB[3],
  Email: csvLineB[4],
  Phone: csvLineB[5]});

然后我使用以下方法导入消息：

USING PERIODIC COMMIT
LOAD CSV FROM 'file:/Users/Oliver/Desktop/Assessment_CSV/Assessment_table_Messages.csv' AS csvLineD
CREATE (n:Message {
  MessageID :csvLineD[0],
  MessageContent:csvLineD[1]});

此时所有节点都正确显示。

然后我尝试从消息 csv 文件中的附加字段创建关系，这些是与 UserID 相对应的 SenderID 和 RecipientID，但是当我运行以下语句时它不会执行任何东西：

USING PERIODIC COMMIT
LOAD CSV FROM 'file:/Users/Oliver/Desktop/Assessment_CSV/Assessment_table_Message.csv' AS csvLineE
MATCH (sender:Users)
WHERE sender.id = csvLineE[3]
MATCH (receiver:Users)
WHERE receiver.id = csvLineE[2]
MATCH (msg:Message)
WHERE msg.id = csvLineE[0]
MERGE(sender)-[:SENT]->(msg)<-[:RECEIVED]-(receiver);

谁能告诉我我做错了什么？

非常感谢任何帮助。

Answer 1

您的第三个查询使用了错误的属性 ID 名称。试试这个：

USING PERIODIC COMMIT
LOAD CSV FROM 'file:/Users/Oliver/Desktop/Assessment_CSV/Assessment_table_Message.csv' AS csvLineE
MATCH (sender:Users)
WHERE sender.UserID = csvLineE[3]
MATCH (receiver:Users)
WHERE receiver.UserID = csvLineE[2]
MATCH (msg:Message)
WHERE msg.MessageID = csvLineE[0]
MERGE(sender)-[:SENT]->(msg)<-[:RECEIVED]-(receiver);

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