我的查询出现问题,其中 FOREACH 子句中定义的变量不可用于后续的 MERGE。在下面的代码片段中,我在创建节点之前检查了每个字段的值是否存在。在某些情况下,这些字段可能会丢失,因此我不想为它们创建节点。然后在最后一个 FOREACH 中,假设对这些节点的引用存储在变量中,我尝试创建它们的关系。
FOREACH(ignoreMe IN CASE WHEN "${record:value('/11')}" <> "" THEN [1] ELSE [] END |
MERGE (company:Company{name:"${record:value('/11')}"}))
FOREACH(ignoreMe IN CASE WHEN "${record:value('/1')}" <> "" THEN [1] ELSE [] END |
MERGE (cloudSuite:CloudSuite{name:"${record:value('/1')}"}))
FOREACH(ignoreMe IN CASE WHEN "${record:value('/18')}" <> "" THEN [1] ELSE [] END |
MERGE (application:Application{name:"${record:value('/18')}"}))
FOREACH(ignoreMe IN CASE WHEN "${record:value('/8')}" <> "" THEN [1] ELSE [] END |
MERGE (applicationInstance:ApplicationInstance{applicationId:"${record:value('/8')}"}))
FOREACH(ignoreMe IN CASE WHEN "${record:value('/9')}" <> "" THEN [1] ELSE [] END |
MERGE (screen:Screen{name:"${record:value('/9')}"}))
FOREACH(ignoreMe IN CASE WHEN "${record:value('/19')}" <> "" THEN [1] ELSE [] END |
MERGE (screenInstance:ScreenInstance{screenId:"${record:value('/19')}"}))
FOREACH(ignoreMe IN CASE WHEN ("${record:value('/0')}" IN ["Accessed"])THEN [1] ELSE [] END |
MERGE (screenInstance)-[:INSTANCE_OF]->(screen)
MERGE (screenInstance)-[:VIEWED_ON]->(applicationInstance)
MERGE (application)-[:IMPLEMENTS]->(screen)
MERGE (session)-[:ACCESSES]->(screenInstance))
然而实际发生的是,当我可视化我的图表时,我看到定义为孤立节点的有效节点以及在一些“幻像”节点之间创建的关系。所以我的问题是,我是否有办法将对有效节点的引用传递给创建关系的 MERGE。