常用的NEO4j语句—个人收藏

增 / 改

创建人物节点
CREATE (n:Person {name:'John'}) RETURN n

创建多个人物节点
CREATE (n:Person {name:'Sally'}) RETURN n;
CREATE (n:Person {name:'Steve'}) RETURN n;
CREATE (n:Person {name:'Mike'}) RETURN n;
CREATE (n:Person {name:'Liz'}) RETURN n;
CREATE (n:Person {name:'Shawn'}) RETURN n;

创建地区节点
CREATE (n:Location {city:'Miami', state:'FL'});
CREATE (n:Location {city:'Boston', state:'MA'});
CREATE (n:Location {city:'Lynn', state:'MA'});
CREATE (n:Location {city:'Portland', state:'ME'});
CREATE (n:Location {city:'San Francisco', state:'CA'});

创建关系
MATCH (a:Person {name:'Liz'}), 
      (b:Person {name:'Mike'}) 
MERGE (a)-[:FRIENDS]->(b)

创建带属性的关系
MATCH (a:Person {name:'Shawn'}), 
      (b:Person {name:'Sally'}) 
MERGE (a)-[:FRIENDS {since:2001}]->(b)

创建不同类型节点之间的关系
MATCH (a:Person {name:'John'}), (b:Location {city:'Boston'}) MERGE (a)-[:BORN_IN {year:1978}]->(b)

查询

查询在Boston出生的人物
MATCH (a:Person)-[:BORN_IN]->(b:Location {city:'Boston'}) RETURN a,b

查询所有对外有关系的节点
MATCH (a)-->() RETURN a

查询所有有关系的节点
MATCH (a)--() RETURN a

查询所有对外有关系的节点，以及关系类型
MATCH (a)-[r]->() RETURN a.name, type(r)

查询所有有结婚关系的节点
MATCH (n)-[:MARRIED]-() RETURN n

创建节点的时候就建好关系
CREATE (a:Person {name:'Todd'})-[r:FRIENDS]->(b:Person {name:'Carlos'})

查找某人朋友的朋友
MATCH (a:Person {name:'Mike'})-[r1:FRIENDS]-()-[r2:FRIENDS]-(friend_of_a_friend) RETURN friend_of_a_friend.name AS fofName

增加修改节点属性
MATCH (a:Person {name:'Liz'}) SET a.age=34;
MATCH (a:Person {name:'Shawn'}) SET a.age=32;

删

删除节点属性
MATCH (a:Person {name:'Mike'}) SET a.test='test'
MATCH (a:Person {name:'Mike'}) REMOVE a.test

删除节点
MATCH (a:Location {city:'Portland'}) DELETE a

删除有关系的节点
MATCH (a:Person {name:'Todd'})-[rel]-(b:Person) DELETE a,b,rel

删除数据库中的图
MATCH (n) DETACH DELETE n