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v4.5
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    v4.5

      Trouver des Nodes

      Vue d'ensemble

      La clause find().nodes() récupère les nodes du graphset qui satisfont des conditions spécifiées.

      Syntaxe

      Alias de la clause : type NODE; alias par défaut est nodes

      Méthode
      Type de Param
      Spécification du Param
      Requis
      Description
      Alias
      nodes() Filtre / Oui Les conditions des nodes à récupérer N/A
      limit() Entier ≥-1 Non Nombre de résultats à renvoyer pour chaque sous-requête, -1 signifie tout retourner N/A

      Exemples

      Exemple de Graph

      Exécutez ces UQLs ligne par ligne dans un graphset vide pour créer ce graph :

      create().node_schema("professor").node_schema("student").edge_schema("mentor").edge_schema("assist")
      create().node_property(@*, "age", int32).node_property(@*, "email", string).edge_property(@*, "year", int32)
      insert().into(@professor).nodes([{_id:"P001",_uuid:1,age:53,email:"[email protected]"},{_id:"P002",_uuid:2,age:27,email:"[email protected]"}])
      insert().into(@student).nodes([{_id:"S001",_uuid:3,age:27,email:"[email protected]"},{_id:"S002",_uuid:4,age:20,email:"[email protected]"},{_id:"S003",_uuid:5,age:25,email:"[email protected]"}])
      insert().into(@mentor).edges([{_uuid:1, _from_uuid:2, _to_uuid:3, year:2020},{_uuid:2, _from_uuid:1, _to_uuid:3, year:2021},{_uuid:3, _from_uuid:1, _to_uuid:4, year:2021},{_uuid:4, _from_uuid:1, _to_uuid:5, year:2022}])
      insert().into(@assist).edges([{_uuid:5, _from_uuid:3, _to_uuid:2, year:2020},{_uuid:6, _from_uuid:4, _to_uuid:1, year:2022}])
      

      Trouver Tous les Nodes

      find().nodes() as n
      return n{*}
      

      Résultat :

      _id _uuid Schema age
      email
      P001 1 professor 53 [email protected]
      P002 2 professor 27 [email protected]
      _id _uuid Schema age
      email
      S001 3 student 27 [email protected]
      S002 4 student 20 [email protected]
      S003 5 student 25 [email protected]

      Trouver des Nodes par ID

      find().nodes({_id == "S001"}) as n
      return n{*}
      

      Résultat :

      _id _uuid Schema age
      email
      S001 3 student 27 [email protected]

      find().nodes({_id in ["P001", "P002"]}) as n
      return n{*}
      

      Résultat :

      _id _uuid Schema age
      email
      P001 1 professor 53 [email protected]
      P002 2 professor 27 [email protected]

      Trouver des Nodes par UUID

      find().nodes(1) as n
      return n{*}
      

      Le filtre {_uuid == 1} peut être simplifié à 1.

      Résultat :

      _id _uuid Schema age
      email
      P001 1 professor 53 [email protected]

      find().nodes([1,3]) as n
      return n{*}
      

      Le filtre {_uuid in [1,3]} peut être simplifié à [1,3].

      Résultat :

      _id _uuid Schema age
      email
      P001 1 professor 53 [email protected]
      _id _uuid Schema age
      email
      S001 3 student 27 [email protected]

      Trouver des Nodes par Schema

      find().nodes({@student}) as n
      return n{*}
      

      Résultat :

      _id _uuid Schema age
      email
      S001 3 student 27 [email protected]
      S002 4 student 20 [email protected]
      S003 5 student 25 [email protected]

      find().nodes({@student || @professor}) as n
      return n{*}
      

      Résultat :

      _id _uuid Schema age
      email
      P001 1 professor 53 [email protected]
      P002 2 professor 27 [email protected]
      _id _uuid Schema age
      email
      S001 3 student 27 [email protected]
      S002 4 student 20 [email protected]
      S003 5 student 25 [email protected]

      Trouver des Nodes par Propriété

      find().nodes({age > 30}) as n
      return n{*}
      

      Résultat :

      _id _uuid Schema age
      email
      P001 1 professor 53 [email protected]

      Trouver des Nodes par Schema et Propriété

      find().nodes({@student.age > 25}) as n
      return n{*}
      

      Résultat :

      _id _uuid Schema age
      email
      S001 3 student 27 [email protected]

      Utiliser l'Alias de la Clause par Défaut

      find().nodes().limit(1)
      return nodes{*}
      

      Résultat :

      _id _uuid Schema age
      email
      P001 1 professor 53 [email protected]

      Utiliser limit()

      find().nodes().limit(3) as n
      return n{*}
      

      Résultat :

      _id _uuid Schema age
      email
      P001 1 professor 53 [email protected]
      P002 2 professor 27 [email protected]
      _id _uuid Schema age
      email
      S001 3 student 27 [email protected]

      Utiliser OPTIONAL

      uncollect [53, 55, 57] as value
      optional find().nodes({age == value}) as n
      return n{*}
      

      Résultat :

      _id _uuid Schema age
      email
      P001 1 professor 53 [email protected]
      _id _uuid Schema
      null null null
      null null null

      Si le préfixe OPTIONAL n'est pas utilisé, les résultats nuls ne seront pas retournés.

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