apoc.export.csv.all

此过程不被认为是多线程安全执行的。因此，并行运行时不支持此过程。更多信息请参阅Cypher 手册 → 并行运行时。

详情
语法	`apoc.export.csv.all(file, config) :: (file, source, format, nodes, relationships, properties, time, rows, batchSize, batches, done, data)`
描述	将整个数据库导出到提供的 CSV 文件。
输入参数	名称	类型	描述
	`file`	`STRING`	将数据导出到的文件名。
	`config`	`MAP`	`{ stream = false :: BOOLEAN, batchSize = 20000 :: INTEGER, bulkImport = false :: BOOLEAN, timeoutSeconds = 100 :: INTEGER, compression = 'None' :: STRING, charset = 'UTF_8' :: STRING, quotes = 'always' :: ['always', 'none', 'ifNeeded'], differentiateNulls = false :: BOOLEAN, sampling = false :: BOOLEAN, samplingConfig :: MAP }`
返回参数	名称	类型	描述
	`file`	`STRING`	导出数据到的文件名。
	`source`	`STRING`	导出数据的摘要。
	`format`	`STRING`	文件导出的格式。
	`nodes`	`INTEGER`	导出的节点数量。
	`relationships`	`INTEGER`	导出的关系数量。
	`properties`	`INTEGER`	导出的属性数量。
	`time`	`INTEGER`	导出持续时间。
	`rows`	`INTEGER`	返回的行数。
	`batchSize`	`INTEGER`	导出运行的批次大小。
	`batches`	`INTEGER`	导出运行的批次数量。
	`done`	`BOOLEAN`	导出是否成功运行。
	`data`	`ANY`	导出返回的数据。

使用示例

本节中的示例基于以下示例图

CREATE (TheMatrix:Movie {title:'The Matrix', released:1999, tagline:'Welcome to the Real World'})
CREATE (Keanu:Person {name:'Keanu Reeves', born:1964})
CREATE (Carrie:Person {name:'Carrie-Anne Moss', born:1967})
CREATE (Laurence:Person {name:'Laurence Fishburne', born:1961})
CREATE (Hugo:Person {name:'Hugo Weaving', born:1960})
CREATE (LillyW:Person {name:'Lilly Wachowski', born:1967})
CREATE (LanaW:Person {name:'Lana Wachowski', born:1965})
CREATE (JoelS:Person {name:'Joel Silver', born:1952})
CREATE
(Keanu)-[:ACTED_IN {roles:['Neo']}]->(TheMatrix),
(Carrie)-[:ACTED_IN {roles:['Trinity']}]->(TheMatrix),
(Laurence)-[:ACTED_IN {roles:['Morpheus']}]->(TheMatrix),
(Hugo)-[:ACTED_IN {roles:['Agent Smith']}]->(TheMatrix),
(LillyW)-[:DIRECTED]->(TheMatrix),
(LanaW)-[:DIRECTED]->(TheMatrix),
(JoelS)-[:PRODUCED]->(TheMatrix);

下面的 Neo4j 浏览器可视化显示了导入的图

The apoc.export.csv.all 过程将整个数据库导出到 CSV 文件或作为流。

以下查询将整个数据库导出到文件 movies.csv

CALL apoc.export.csv.all("movies.csv", {})

结果
file	source	format	nodes	relationships	properties	time	rows	batchSize	batches	done	data
"movies.csv"	"database: nodes(8), rels(7)"	"csv"	8	7	21	39	15	20000	1	TRUE	NULL

movies.csv 的内容如下所示

movies.csv

"_id","_labels","born","name","released","tagline","title","_start","_end","_type","roles"
"188",":Movie","","","1999","Welcome to the Real World","The Matrix",,,,
"189",":Person","1964","Keanu Reeves","","","",,,,
"190",":Person","1967","Carrie-Anne Moss","","","",,,,
"191",":Person","1961","Laurence Fishburne","","","",,,,
"192",":Person","1960","Hugo Weaving","","","",,,,
"193",":Person","1967","Lilly Wachowski","","","",,,,
"194",":Person","1965","Lana Wachowski","","","",,,,
"195",":Person","1952","Joel Silver","","","",,,,
,,,,,,,"189","188","ACTED_IN","[""Neo""]"
,,,,,,,"190","188","ACTED_IN","[""Trinity""]"
,,,,,,,"191","188","ACTED_IN","[""Morpheus""]"
,,,,,,,"192","188","ACTED_IN","[""Agent Smith""]"
,,,,,,,"193","188","DIRECTED",""
,,,,,,,"194","188","DIRECTED",""
,,,,,,,"195","188","PRODUCED",""

以下查询在 data 列中返回整个数据库的流

CALL apoc.export.csv.all(null, {stream:true})
YIELD file, nodes, relationships, properties, data
RETURN file, nodes, relationships, properties, data

结果
file	nodes	relationships	properties	data
NULL	8	7	21	"\"_id\",\"_labels\",\"born\",\"name\",\"released\",\"tagline\",\"title\",\"_start\",\"_end\",\"_type\",\"roles\" \"188\",\":Movie\",\"\",\"\",\"1999\",\"Welcome to the Real World\",\"The Matrix\",,,, \"189\",\":Person\",\"1964\",\"Keanu Reeves\",\"\",\"\",\"\",,,, \"190\",\":Person\",\"1967\",\"Carrie-Anne Moss\",\"\",\"\",\"\",,,, \"191\",\":Person\",\"1961\",\"Laurence Fishburne\",\"\",\"\",\"\",,,, \"192\",\":Person\",\"1960\",\"Hugo Weaving\",\"\",\"\",\"\",,,, \"193\",\":Person\",\"1967\",\"Lilly Wachowski\",\"\",\"\",\"\",,,, \"194\",\":Person\",\"1965\",\"Lana Wachowski\",\"\",\"\",\"\",,,, \"195\",\":Person\",\"1952\",\"Joel Silver\",\"\",\"\",\"\",,,, ,,,,,,,\"189\",\"188\",\"ACTED_IN\",\"[\"\"Neo\"\"]\" ,,,,,,,\"190\",\"188\",\"ACTED_IN\",\"[\"\"Trinity\"\"]\" ,,,,,,,\"191\",\"188\",\"ACTED_IN\",\"[\"\"Morpheus\"\"]\" ,,,,,,,\"192\",\"188\",\"ACTED_IN\",\"[\"\"Agent Smith\"\"]\" ,,,,,,,\"193\",\"188\",\"DIRECTED\",\"\" ,,,,,,,\"194\",\"188\",\"DIRECTED\",\"\" ,,,,,,,\"195\",\"188\",\"PRODUCED\",\"\" "

你可以使用配置 sampling（默认值：false）。使用此配置，apoc.export.csv.all 过程会在内部使用 apoc.meta.nodeTypeProperties 和 apoc.meta.relTypeProperties 过程来获取属性类型。你可以使用 samplingConfig: MAP 配置来自定义这两个 apoc.meta.* 过程的配置，以限制要分析的节点/关系的数量。

因此你可以使用以下数据集执行

CREATE (:User:Sample {`last:Name`:'Galilei'}), (:User:Sample {address:'Universe'}),
    (:User:Sample {foo:'bar'})-[:KNOWS {one: 'two', three: 'four'}]->(:User:Sample {baz:'baa', foo: true})

结合以下查询

CALL apoc.export.csv.all('movies.csv', {sampling: true, samplingConfig: {sample: 1}})

结果
file	source	format	nodes	relationships	properties	time	rows	batchSize	batches	done	data
"movies.csv"	"database: nodes(4), rels(1)"	"csv"	4	1	3	4	5	20000	1	TRUE	NULL

执行上述查询将输出类似以下内容（结果可能因 sample 而异）

movies.csv

"_id","_labels","baz","foo","_start","_end","_type"
"0",":Sample:User","","",,,
"1",":Sample:User","","",,,
"2",":Sample:User","","bar",,,
"3",":Sample:User","baa","true",,,
,,,,"2","3","KNOWS"

apoc.export.csv.all 的更多文档