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v4.5
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    v4.5

      YIELD

      Vue d’ensemble

      L'instruction YIELD peut être utilisée dans les instructions CALL et NEXT pour sélectionner et renommer des variables afin de les exposer dans les parties suivantes de la requête.

      <yield clause> ::= "YIELD" <yield item list>
      
      <yield item list> ::= <yield item> [ { "," <yield item> }... ]
      
      <yield item> ::= <yield item name> [ <yield item alias> ]
      
      <yield item name> ::= <field name>
      
      <yield item alias> ::= "AS" <binding variable>
      

      Exemple de Graph

      Les exemples suivants s'exécutent sur ce graph :

      Pour créer ce graph, exécutez la requête suivante sur un graph vide :

      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)
      

      NEXT YIELD

      Cette requête trouve les clubs rejoints par les utilisateurs suivis par l'utilisateur purplechalk :

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

      Résultat:

      collect_list(c)
      ["C01","C02"]
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