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      NEXT

      概述

      NEXT语句用于按顺序串联多个线性或复合查询语句,前一个查询的结果将结转到下一个查询。NEXT实现的高级线性构造能实现更复杂的查询。

      <advanced linear composition> ::=
        <query statement> <next statement> [ { <next statement> }... ]
      
      <next statement> ::=
        "NEXT" [ <yield clause> ] <query statement>
      
      <query statement> ::=
        <linear query statement> | <composite query statement>
                
      <yield clause> ::= 
        "YIELD" <yield item> [ { "," <yield item> }... ]
      
      <yield item> ::=
        <column name> [ "AS" <binding variable> ]
      

      详情

      • 每个<query statement>结尾必须包含一个RETURN语句,指定传递给NEXT后紧挨的下一个<query statement>的变量。
      • RETURN语句支持使用YIELD从句,详见NEXT YIELD

      示例图

      CREATE GRAPH myGraph { 
        NODE User ({name string}),
        NODE Club (),
        EDGE Follows ()-[{}]->(),
        EDGE Joins ()-[{memberNo uint32}]->()
      } PARTITION BY HASH(Crc32) SHARDS [1]
      

      INSERT (rowlock:User {_id: 'U01', name: 'rowlock'}),
             (brainy:User {_id: 'U02', name: 'Brainy'}),
             (purplechalk:User {_id: 'U03', name: 'purplechalk'}),
             (mochaeach:User {_id: 'U04', name: 'mochaeach'}),
             (lionbower:User {_id: 'U05', name: 'lionbower'}),
             (c01:Club {_id: 'C01'}),
             (c02:Club {_id: 'C02'}),
             (rowlock)-[:Follows]->(brainy),
             (mochaeach)-[:Follows]->(brainy),
             (purplechalk)-[:Follows]->(mochaeach),
             (purplechalk)-[:Follows]->(lionbower),
             (brainy)-[:Joins {memberNo: 1}]->(c01),
             (lionbower)-[:Joins {memberNo: 2}]->(c01),
             (mochaeach)-[:Joins {memberNo: 9}]->(c02)
      

      基本用法

      本查询返回是是C01的成员,同时被U03关注的用户:

      MATCH ({_id: "C01"})<-[:Joins]-(u1:User)
      RETURN u1
      NEXT
      MATCH ({_id: "U03"})-[:Follows]->(u2:User)
      WHERE u2 = u1
      RETURN u2
      

      结果:u2

      _id _uuid schema
      values
      U05 Sys-gen User {name: "lionbower"}

      本查询报错,因为变量name超出作用域:

      LET name = "rowlock"
      RETURN name
      NEXT
      MATCH ({_id: "C01"})<-[:Joins]-(u:User)
      RETURN u
      NEXT
      RETURN name IN collect_list(u.name)
      

      使用分组结果

      本查询返回会员数最多的俱乐部中各用户的名字:

      MATCH (c:Club)<-[:Joins]-()
      RETURN c, count(c) AS cnt GROUP BY c
      ORDER BY cnt DESC LIMIT 1
      NEXT
      MATCH (c)<-[:Joins]-(u)
      RETURN c._id, collect_list(u.name)
      

      结果:

      c._id collect_list(u.name)
      C01 ["Brainy","lionbower"]

      使用聚合结果

      本查询插入从U01指向C01Joins边,并将memberNo属性设为下一个最大值:

      MATCH ({_id: "C01"})<-[e1:Joins]-()
      RETURN max(e1.memberNo) AS maxNo
      NEXT
      MATCH (u {_id: "U01"}), (c {_id: "C01"})
      INSERT (c)<-[e2:Joins {memberNo: maxNo + 1}]-(u)
      RETURN e2
      

      结果:e2

      _uuid
      _from
      _to
      _from_uuid
      _to_uuid
      schema
      values
      Sys-gen U01 C01 UUID of U01 UUID of C01 Joins {memberNo: 3}

      NEXT YIELD

      YIELD从句用于在前一条查询中选择并重命名(如果需要)变量,允许下一个查询继续使用它们;未被选择的变量将不再可用。忽略YIELD从句时,默认前一条查询的所有变量继续传递到下一条查询。

      本查询返回purplechalk关注的用户所在的社团:

      LET name = "purplechalk"
      MATCH (:User {name: name})-[:Follows]->(u:User)
      RETURN *
      NEXT YIELD u
      MATCH (u)-[:Joins]->(c:Club)
      RETURN u.name, c._id
      

      结果:

      u.name c._id
      mochaeach C02
      lionbower C01
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