Command line 在cypher中批处理或从Neo4j浏览器上载多个文件

我使用以下查询将数据从csv加载到Neo4j：

CREATE CONSTRAINT ON (e:Entity) ASSERT e.entity IS UNIQUE;

USING PERIODIC COMMIT 1000
LOAD CSV WITH HEADERS FROM 'file:/file1.csv' AS line FIELDTERMINATOR '|'

WITH line 

MERGE (e0:Entity {entity: line.entities_0_entity})
ON CREATE SET e0.confidence = toFloat(line.entities_0_confidence)

MERGE (e1:Entity {entity: line.entities_1_entity})
ON CREATE SET e1.confidence = toFloat(line.entities_1_confidence)

MERGE (e0)-[r:REL {name: line.relation_relation, confidence: toFloat(line.relation_confidence)}]->(e1)

RETURN *

---

有人能告诉等价的查询从Neo4j命令行加载数据，或者在浏览器中动态更改文件名，或者像“file:/file*”那样传递它吗

您只需将所有文件放在neo4j的导入目录中，然后使用bash脚本加载所有文件：

#!bin/sh

for file in /Users/ikwattro/dev/_graphs/310/import/*
do
    curl -H "Content-Type: application/json" \
        -d '{"statements": [{"statement": "LOAD CSV WITH HEADERS FROM file:///$file AS row ..."}]' \
        http://localhost:7474/db/data/transaction/commit
done

---

Neo4j本身没有标准方法指定要导入的多个文件。

您只需将所有文件放在Neo4j的导入目录中，然后使用bash脚本将它们全部加载：

#!bin/sh

for file in /Users/ikwattro/dev/_graphs/310/import/*
do
    curl -H "Content-Type: application/json" \
        -d '{"statements": [{"statement": "LOAD CSV WITH HEADERS FROM file:///$file AS row ..."}]' \
        http://localhost:7474/db/data/transaction/commit
done

---

Neo4j本身没有标准方法指定要导入的多个文件。

如果要多次处理同一个Cypher语句，每次调整一个或多个值，可以使用APOC过程

在您的示例中，您希望预先执行

CREATE CONSTRAINT

语句（并且只执行一次）

例如：

CALL apoc.periodic.iterate(
  "
    WITH ['file1', 'x', 'y'] AS filenames,
    UNWIND filenames AS name
    RETURN name;
  ",
  "
    USING PERIODIC COMMIT 1000
    LOAD CSV WITH HEADERS FROM 'file:/' + {name} + '.csv' AS line FIELDTERMINATOR '|'
    WITH line 
    MERGE (e0:Entity {entity: line.entities_0_entity})
    ON CREATE SET e0.confidence = toFloat(line.entities_0_confidence)
    MERGE (e1:Entity {entity: line.entities_1_entity})
    ON CREATE SET e1.confidence = toFloat(line.entities_1_confidence)
    MERGE (e0)-[r:REL {name: line.relation_relation, confidence: toFloat(line.relation_confidence)}]->(e1);
  ",
  {});

---

此查询将执行

LOAD CSV

语句3次（顺序执行，因为过程的

parallel

选项默认为

false

），每次传递一个字符串（“file1”、“y”和“z”）作为

name

参数。

如果要多次处理同一个Cypher语句，每次调整一个或多个值时，可以使用APOC程序

在您的示例中，您希望预先执行

CREATE CONSTRAINT

语句（并且只执行一次）

例如：

CALL apoc.periodic.iterate(
  "
    WITH ['file1', 'x', 'y'] AS filenames,
    UNWIND filenames AS name
    RETURN name;
  ",
  "
    USING PERIODIC COMMIT 1000
    LOAD CSV WITH HEADERS FROM 'file:/' + {name} + '.csv' AS line FIELDTERMINATOR '|'
    WITH line 
    MERGE (e0:Entity {entity: line.entities_0_entity})
    ON CREATE SET e0.confidence = toFloat(line.entities_0_confidence)
    MERGE (e1:Entity {entity: line.entities_1_entity})
    ON CREATE SET e1.confidence = toFloat(line.entities_1_confidence)
    MERGE (e0)-[r:REL {name: line.relation_relation, confidence: toFloat(line.relation_confidence)}]->(e1);
  ",
  {});

此查询将执行

LOAD CSV

语句3次（顺序执行，因为过程的

parallel

选项默认为

false

），每次将其中一个字符串（“file1”、“y”和“z”）作为

名称

参数传递