neo4j - '无法在此处创建带有标签或属性的节点。该变量已经在 Neo4j 中的上下文中声明

Question

大约十分钟前，我刚刚下载并安装了 Neo4j 3.0.0。我正在用 Neo4j 创建一个图形数据库。

当我尝试一次运行 3 个语句时，出现错误:
Can't create node 'famA' with labels or properties here. The variable is already declared in this context
(这是我试图放入定义节点的地方)。

我不确定问题是什么。我的第一个想法是我需要跨块携带变量，因为我以前遇到过这个问题，但这似乎是另一种情况(抱歉，我还是 Neo4j 的新手)。

看看是怎么回事 famA ，它只声明一次，看起来语法没问题？这里没问题:

// Create the definition node:
CREATE 
    (famA:Family {family_ID:'A'}) 
    WITH famA
    MATCH (a:Person {name:"a"})-[*]-(b:Person)  
    MERGE (famA:Family)<-[:FAMILY]-(a) 
    MERGE (famA:Family)<-[:FAMILY]-(b)

我还想指出，上周我的脚本运行良好——也许这是新版本的一些问题？

有没有人有任何想法？谢谢。

这是创建数据库的代码:

// First family:  family_ID = A.  This family has 3 members with Alzheimers who are not alive, and more than half of them are Left handed
CREATE 
    (   a:Person {name: 'a',    id:'1', Gender:'Male',   Diagnosis: 'Alzheimers', `Is Alive?`: 'No',   Handedness: 'Left',  `Risk Score`: 'PURPLE'}),
    ( aSP:Person {name: 'aSP',  id:'2', Gender:'Female', Diagnosis: 'Alzheimers', `Is Alive?`: 'No',   Handedness: 'Left', `Risk Score`: 'GIRAFFE'}),
    (   b:Person {name: 'b',    id:'3', Gender:'Male',   Diagnosis: 'Normal',     `Is Alive?`: 'No',   Handedness: 'Left', `Risk Score`: 'PURPLE'}),
    ( bSP:Person {name: 'bSP',  id:'4', Gender:'Female', Diagnosis: 'Alzheimers', `Is Alive?`: 'No',   Handedness: 'Right', `Risk Score`: 'GIRAFFE'}),
    (bSib:Person {name: 'bSib', id:'5', Gender:'Female', Diagnosis: 'MCI',        `Is Alive?`: 'No',   Handedness: 'Left',  `Risk Score`: 'GIRAFFE'}),
    (   c:Person {name: 'c',    id:'6', Gender:'Male',   Diagnosis: 'MCI',        `Is Alive?`: 'No',   Handedness: 'Right', `Risk Score`: 'PURPLE'}),
    (cSib:Person {name: 'cSib', id:'7', Gender:'Female', Diagnosis: 'Alzheimers',  `Is Alive?`: 'Yes', Handedness: 'Left',  `Risk Score`: 'GIRAFFE'})

CREATE
    (a)-[:SPOUSE]->(aSP),
    (b)-[:CHILD]->(a),
    (b)-[:CHILD]->(aSP),
    (b)-[:SPOUSE]->(bSP),
    (bSib)-[:SIBLING]->(b),
    (bSib)-[:CHILD]->(aSP),
    (c)-[:CHILD]->(b),
    (c)-[:CHILD]->(bSP),
    (cSib)-[:SIBLING]->(c),
    (cSib)-[:CHILD]->(bSP)

// Create the definition node:
CREATE 
    (famA:Family {family_ID:'A'}) 
    WITH famA
    MATCH (a:Person {name:"a"})-[*]-(b:Person)  
    MERGE (famA:Family)<-[:FAMILY]-(a) 
    MERGE (famA:Family)<-[:FAMILY]-(b)

Answer 1

从 famA merge 移除标签(如果您使用带标签的 merge - 这将指示节点创建，但此节点之前已创建):

// Create the definition node:
CREATE 
    (famA:Family {family_ID:'A'}) 
    WITH famA
    MATCH (a:Person {name:"a"})-[*]-(b:Person)  
    MERGE (famA)<-[:FAMILY]-(a) 
    MERGE (famA)<-[:FAMILY]-(b)