neo4j - 如何在 neo4j 中从 csv 创建节点和关系

Question

我正在加载一个带有cypher查询的 csv 文件。csv 文件有 4 列。2 表示列，2 表示表，如下所示。

我想从这 4 列创建 2 种类型的节点数据库和表。如何为数据库和列创建唯一节点并在它们之间建立关系？

根据logisima's答案，我在查询下方添加了为数据库和列创建节点并添加了关系。但是节点中有一些重复。

        `LOAD CSV WITH HEADERS FROM 'file:///test1.csv' AS row
        MERGE (source:Database { source: row.Source_DB})
        MERGE (target:Database { target: row.Target_DB})
        MERGE (source_table:Table { source_table: row.Source_Table})
        MERGE (target_table:Table { source_table: row.Target_Table})
        MERGE (source)-[:LINKED_TO]-> (target)
        MERGE (source)-[:LINKED_TO]-> (source_table)
        MERGE (source)-[:LINKED_TO]-> (target_table)
        MERGE (target)-[:LINKED_TO]-> (target_table)`

请耐心等待我是 Neo4j 的新手。

标签： neo4jcypher

Answer 1

类似的东西？

LOAD CSV WITH HEADERS FROM 'file:///MASTER.csv' AS row

MERGE (source:Database { db: row.Source_DB, table: row.Source_Table})
MERGE (target:Database { db: row.Target_DB, table: row.Target_Table})
MERGE (source)-[:LINKED_TO]->(target)

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更新评论

CREATE CONSTRAINT ON (n:Database) ASSERT n.db IS UNIQUE;
CREATE CONSTRAINT ON (n:Table) ASSERT n.id IS UNIQUE;

LOAD CSV WITH HEADERS FROM 'file:///MASTER.csv' AS row

MERGE (sourceDb:Database { db: row.Source_DB})
MERGE (sourceTable:Table { id: row.Source_DB + "-" + row.Source_Table, table: row.Source_Table})
MERGE (sourceDb)-[:HAS_TABLE]->(sourceTable)

MERGE (targetDb:Database { db: row.Target_DB})
MERGE (targetTable:Table { id: row.Target_DB + "-" + row.Target_Table, table: row.Target_Table})
MERGE (targetDb)-[:HAS_TABLE]->(targetTable)

MERGE (sourceTable)-[:LINKED_TO]->(targetTable);