Question

我是Neo4J的新手（以及一般的数据库）。我读过“Learning Neo4J”一书，创建节点没什么问题。我在创建关系方面遇到了很大问节点代表国家（仅两个），也代表城市（八个）。

以下是我用于创建国家/地区节点的CREATE语句：

CREATE(SG: Country {Name:'Singapore', FullName:'Republic of
   Singapore'})
CREATE(MY: Country {Name:'Malaysia',
   FullName:'Malaysia'})

以下是我创建城市的CREATE语句：

CREATE(City1: City {Name:'Singapore'})
CREATE(City2: City {Name:'Kuala Lumpur'})
CREATE(City3: City {Name:'Johor Bahru'})
CREATE(City4: City {Name:'Malacca'})
CREATE(City5: City {Name:'Georgetown'})
CREATE(City6: City {Name:'Alor Star'})
CREATE(City7: City {Name:'Klang'})
CREATE(City8: City {Name:'Shah Alam'})

到目前为止一切顺利。但是，当我发出这些命令来创建关系时，它们不起作用：

CREATE(City1)-[:CITY_IN]->(SG)
CREATE(City2)-[:CITY_IN]->(MY)
CREATE(City3)-[:CITY_IN]->(MY)
CREATE(City4)-[:CITY_IN]->(MY)
CREATE(City5)-[:CITY_IN]->(MY)
CREATE(City6)-[:CITY_IN]->(MY)
CREATE(City7)-[:CITY_IN]->(MY)
CREATE(City8)-[:CITY_IN]->(MY)

我做错了什么？谢谢。

诚恳， CKLee

Answer 1

我猜你在浏览器/ shell中分别运行了这三个cypher块？

如果是这样，您就丢失了标识符所代表的内容。如果您将其作为一个事务运行，这将有效 -

CREATE(SG: Country {Name:'Singapore', FullName:'Republic of
   Singapore'})
CREATE(MY: Country {Name:'Malaysia',
   FullName:'Malaysia'})
CREATE(City1: City {Name:'Singapore'})
CREATE(City2: City {Name:'Kuala Lumpur'})
CREATE(City3: City {Name:'Johor Bahru'})
CREATE(City4: City {Name:'Malacca'})
CREATE(City5: City {Name:'Georgetown'})
CREATE(City6: City {Name:'Alor Star'})
CREATE(City7: City {Name:'Klang'})
CREATE(City8: City {Name:'Shah Alam'})
CREATE(City1)-[:CITY_IN]->(SG)
CREATE(City2)-[:CITY_IN]->(MY)
CREATE(City3)-[:CITY_IN]->(MY)
CREATE(City4)-[:CITY_IN]->(MY)
CREATE(City5)-[:CITY_IN]->(MY)
CREATE(City6)-[:CITY_IN]->(MY)
CREATE(City7)-[:CITY_IN]->(MY)
CREATE(City8)-[:CITY_IN]->(MY)

在Neo4J中创建关系

1 个答案: