如何解决Neo4j 嵌入式 DROP INDEX 引发奇怪的错误

设置

CREATE INDEX index_2384723 IF NOT EXISTS FOR (n:Movie) ON (n.title)

运行

call db.indexes() yield name,labelsOrTypes
where labelsOrTypes = ["Movie"]
DROP INDEX name IF EXISTS
RETURN name

期待

要删除名为 index_2384723 的索引和一个返回值：

index_2384723

现实

Invalid input 'R': expected 'e/E' (line 3,column 2 (offset: 77))
"DROP INDEX name IF EXISTS"
  ^

但是为什么呢？这是neo4j密码解析错误还是我这边的错误？我不明白...

独立查询有效

call db.indexes() yield name,labelsOrTypes
where labelsOrTypes = ["Movie"]
RETURN name

这有效。和

DROP INDEX index_2384723 IF EXISTS

这也有效...

解决方法

无法使用密码获取索引。 db.indexes() 返回的名称是索引的值字符串（或名称）而不是索引本身。您可以按照以下步骤将其删除。

1. List the index (or indices) that you want to remove

   call db.indexes() yield name,labelsOrTypes 
   WITH name,labelsOrTypes where ANY (lbl in ['Movie','Person'] WHERE lbl in labelsOrTypes)
   RETURN name,labelsOrTypes

2. Pick the index (or indices) that you want to delete and copy/paste in neo4j browser

   DROP INDEX index_2384723 IF EXISTS;
   DROP INDEX index_Person IF EXISTS;

 3. Execute and verify

   Removed 1 index,completed after 4 ms.