执行 DELETE 后什么都没有

Question

我有以下查询：

    MATCH (u:User)
        WHERE u.id = $userId
    MERGE (p:Palette {name: $name})
        ON CREATE 
            SET p.name = $name
            SET p.id = apoc.create.uuid()
            MERGE (u)-[cr:CREATED]->(p)
    MERGE (u)-[sa:SAVED]->(p)
    WITH p MATCH (p)-[in:INCLUDES]->() 
        DELETE in
    WITH u MATCH (p:Palette)
        WHERE (u)-[:SAVED]-() AND p.name = $name
    FOREACH (color IN $colors |
        MERGE (c:Color {hex: color.hex})
        ON CREATE 
            SET c.hex = color.hex
        MERGE (p)-[inc:INCLUDES]->(c)

在 DELETE in 之前一切都按预期工作，然后没有其他任何事情发生。我收到以下错误：

Neo4jError: Invalid input '': expected ")" "CALL" "CREATE" "DELETE" "DETACH" "FOREACH" "LOAD" "MATCH" "MERGE" "ON" "OPTIONAL" "REMOVE" "RETURN" "SET" "UNWIND" "USE" "WITH"

如何在 DELETE statement 之后继续此查询？如果我将其分成 2 个查询（第一个以 DELETE in 结尾），那么一切都会按预期进行。

Answer 1

如果我没理解错的话，DELETE前面的p和后面的p是一样的。如果是这种情况，请使用 WITH 保留您已经搜索过的项目。所以你可以试试：

    MATCH (u:User)
        WHERE u.id = $userId
    MERGE (p:Palette {name: $name})
        ON CREATE 
            SET p.name = $name
            SET p.id = apoc.create.uuid()
            MERGE (u)-[cr:CREATED]->(p)
    MERGE (u)-[sa:SAVED]->(p)
    WITH p, u MATCH (p)-[inc:INCLUDES]->() 
    WITH p, u, inc
        DELETE inc
    WITH p
    FOREACH (color IN $colors |
        MERGE (c:Color {hex: color.hex})
        ON CREATE 
            SET c.hex = color.hex
        MERGE (p)-[inc:INCLUDES]->(c)

我试过了：

MATCH (p:Palette)
WHERE p.name = "First test palette"
MATCH (p)-[inc:INCLUDES]->(c:Color)
WITH p, inc
DELETE inc
WITH p
MATCH (u)-[:SAVED]-(p)
RETURN u, p

关于这个数据样本：

MERGE (e:User {name: "user"})
MERGE (a:Palette {name: "First test palette"})
MERGE (b:Color {hex: "#123123"})
MERGE (c:Color {hex: "#ffffff"})
MERGE (d:Color {hex: "#000000"})

MERGE (a)-[:INCLUDES]-(b)
MERGE (a)-[:INCLUDES]-(c) 
MERGE (a)-[:INCLUDES]-(d) 
MERGE (e)-[:SAVED]-(a)

它按预期工作。

执行 DELETE 后什么都没有

Nothing after DELETE gets executed

neo4j

cypher