更新数据(SET命令)
1.创建一个图数据库
CREATE (diana:Person {name: "Diana"})
CREATE (melissa:Person {name: "Melissa", twitter: "@melissa"})
CREATE (dan:Person {name: "Dan", twitter: "@dan", yearsExperience: 6})
CREATE (sally:Person {name: "Sally", yearsExperience: 4})
CREATE (john:Person {name: "John", yearsExperience: 5})
CREATE (jennifer:Person {name: "Jennifer", twitter: "@jennifer", yearsExperience: 5})
CREATE (joe:Person {name: "Joe"})
CREATE (mark:Person {name: "Mark", twitter: "@mark"})
CREATE (ann:Person {name: "Ann"})
CREATE (xyz:Company {name: "XYZ"})
CREATE (x:Company {name: "Company X"})
CREATE (a:Company {name: "Company A"})
CREATE (Neo4j:Company {name: "Neo4j"})
CREATE (abc:Company {name: "ABC"})
CREATE (query:Technology {type: "Query Languages"})
CREATE (etl:Technology {type: "Data ETL"})
CREATE (integrations:Technology {type: "Integrations"})
CREATE (graphs:Technology {type: "Graphs"})
CREATE (dev:Technology {type: "Application Development"})
CREATE (java:Technology {type: "Java"})
CREATE (diana)-:LIKES->(query)
CREATE (melissa)-:LIKES->(query)
CREATE (dan)-:LIKES->(etl)<-:LIKES-(melissa)
CREATE (xyz)<-:WORKS_FOR-(sally)-:LIKES->(integrations)<-:LIKES-(dan)
CREATE (sally)<-:IS_FRIENDS_WITH-(john)-:LIKES->(java)
CREATE (john)<-:IS_FRIENDS_WITH-(jennifer)-:LIKES->(java)
CREATE (john)-:WORKS_FOR->(xyz)
CREATE (sally)<-:IS_FRIENDS_WITH-(jennifer)-:IS_FRIENDS_WITH->(melissa)
CREATE (joe)-:LIKES->(query)
CREATE (x)<-:WORKS_FOR-(diana)<-:IS_FRIENDS_WITH-(joe)-:IS_FRIENDS_WITH->
(mark)-:LIKES->(graphs)<-:LIKES-(jennifer)-:WORKS_FOR->(Neo4j)
CREATE (ann)<-:IS_FRIENDS_WITH-(jennifer)-:IS_FRIENDS_WITH->(mark)
CREATE (john)-:LIKES->(dev)<-:LIKES-(ann)-:IS_FRIENDS_WITH->(dan)-:WORKS_FOR->(abc)
CREATE (ann)-:WORKS_FOR->(abc)
CREATE (a)<-:WORKS_FOR-(melissa)-:LIKES->(graphs)<-:LIKES-(diana)
//查询创建的结果
MATCH (n)
OPTIONAL MATCH (n)-rel-(m)
RETURN n, rel, m
2.更新节点属性
3.更新关系属性
删除数据
1.删除关系(DELETE命令)
2.删除节点(DELETE/DETACH DELETE)
DELETE可以删除没有关系的节点
DETACH DELETE 删除节点并删除连接节点的关系
3.删除属性(REMOVE/SET)
remove是直接删除这个属性了
set n.birthdate=null是相当于将这个值给隐藏了，再set n.birthdate=date('2001.01.12')是可以的
使用MERGE避免数据重复(先查询再创建)
1.节点上使用
2.在关系上使用
3.处理merge条件
