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apoc.meta.stats

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

详情
语法	`apoc.meta.stats() :: (labelCount, relTypeCount, propertyKeyCount, nodeCount, relCount, labels, relTypes, relTypesCount, stats)`
描述	返回事务性数据库统计信息中存储的元数据。
返回参数	名称	类型	描述
	`labelCount`	`INTEGER`	不同节点标签的总数。
	`relTypeCount`	`INTEGER`	不同关系类型的总数。
	`propertyKeyCount`	`INTEGER`	属性键的数量。
	`nodeCount`	`INTEGER`	节点总数。
	`relCount`	`INTEGER`	关系总数。
	`labels`	`MAP`	标签及其计数的映射。
	`relTypes`	`MAP`	按起始或结束节点标签划分的关系类型映射。
	`relTypesCount`	`MAP`	关系类型及其计数的映射。
	`stats`	`MAP`	包含此过程所有给定返回字段的映射。

使用示例

以下示例基于以下示例图

CREATE (Keanu:Person {name:'Keanu Reeves', born:1964})
CREATE (TomH:Person {name:'Tom Hanks', born:1956})

CREATE (TheMatrix:Movie {title:'The Matrix', released:1999, tagline:'Welcome to the Real World'})
CREATE (TheMatrixReloaded:Movie {title:'The Matrix Reloaded', released:2003, tagline:'Free your mind'})
CREATE (TheMatrixRevolutions:Movie {title:'The Matrix Revolutions', released:2003, tagline:'Everything that has a beginning has an end'})
CREATE (SomethingsGottaGive:Movie {title:"Something's Gotta Give", released:2003})
CREATE (TheDevilsAdvocate:Movie {title:"The Devil's Advocate", released:1997, tagline:'Evil has its winning ways'})

CREATE (YouveGotMail:Movie {title:"You've Got Mail", released:1998, tagline:'At odds in life... in love on-line.'})
CREATE (SleeplessInSeattle:Movie {title:'Sleepless in Seattle', released:1993, tagline:'What if someone you never met, someone you never saw, someone you never knew was the only someone for you?'})
CREATE (ThatThingYouDo:Movie {title:'That Thing You Do', released:1996, tagline:'In every life there comes a time when that thing you dream becomes that thing you do'})
CREATE (CloudAtlas:Movie {title:'Cloud Atlas', released:2012, tagline:'Everything is connected'})

CREATE (Keanu)-[:ACTED_IN {roles:['Neo']}]->(TheMatrix)
CREATE (Keanu)-[:ACTED_IN {roles:['Neo']}]->(TheMatrixReloaded)
CREATE (Keanu)-[:ACTED_IN {roles:['Neo']}]->(TheMatrixRevolutions)
CREATE (Keanu)-[:ACTED_IN {roles:['Julian Mercer']}]->(SomethingsGottaGive)
CREATE (Keanu)-[:ACTED_IN {roles:['Kevin Lomax']}]->(TheDevilsAdvocate)

CREATE (TomH)-[:ACTED_IN {roles:['Joe Fox']}]->(YouveGotMail)
CREATE (TomH)-[:ACTED_IN {roles:['Sam Baldwin']}]->(SleeplessInSeattle)
CREATE (TomH)-[:ACTED_IN {roles:['Mr. White']}]->(ThatThingYouDo)
CREATE (TomH)-[:ACTED_IN {roles:['Zachry', 'Dr. Henry Goose', 'Isaac Sachs', 'Dermot Hoggins']}]->(CloudAtlas);

CALL apoc.meta.stats();

结果
labelCount	relTypeCount	propertyKeyCount	nodeCount	relCount	labels	relTypes	relTypesCount	stats
9	5	17	11	9	{Movie: 9, Person: 2}	{`(:Person)-[:ACTED_IN]→()`: 9, `()-[:ACTED_IN]→(:Movie)`: 9, `()-[:ACTED_IN]→()`: 9}	{ACTED_IN: 9}	{relTypeCount: 5, propertyKeyCount: 17, labelCount: 9, nodeCount: 11, relCount: 9, labels: {Movie: 9, Person: 2}, relTypes: {`(:Person)-[:ACTED_IN]→()`: 9, `()-[:ACTED_IN]→(:Movie)`: 9, `()-[:ACTED_IN]→()`: 9}}

请注意，relTypesCount 字段为每种关系类型返回一个等于 MATCH ()-[r:RELATIONSHIP_TYPE]→() RETURN count(r) 的计数（唯一关系与唯一模式）。