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      Update

      Overview

      The update() clauses is used to update values of properties (except _id and _uuid) of nodes and edges that meet the given conditions.

      Syntax

      // Update nodes
      update().nodes(<filter>)
        .set({<property1>: <value1>, <property2>: <value2> ...})
        .limit(<N>)
      
      // Update edges
      update().edges(<filter>)
        .set({<property1>: <value1>, <property2>: <value2> ...})
        .limit(<N>)
      
      • The nodes or edges to be updated must meet the conditions specified in the nodes() or edges() method. Leave it blank to specify all nodes or edges.
      • Provide new values for properties in the set() method.
      • Optionally use the limit() method to restrict the number of nodes or edges to update.
      • Allow to define an alias for the clause, with the data type being either NODE or EDGE.

      Example Graph

      Run these UQLs row by row in an empty graphset to create this graph:

      create().node_schema("user").edge_schema("follow")
      create().node_property(@user, "name").node_property(@user, "age", int32).edge_property(@follow, "time", datetime)
      insert().into(@user).nodes([{_id:"U001", _uuid:1, name:"Jason", age:30}, {_id:"U002", _uuid:2, name:"Tim"}, {_id:"U003", _uuid:3, name:"Grace", age:25}, {_id:"U004", _uuid:4, name:"Ted", age:26}])
      insert().into(@follow).edges([{_uuid:1, _from_uuid:4, _to_uuid:1, time:"2021-9-10"}, {_uuid:2, _from_uuid:3, _to_uuid:2, time:"2020-3-12"}, {_uuid:3, _from_uuid:4, _to_uuid:2, time:"2023-7-30"}])
      

      Examples

      Update Nodes

      update().nodes({name == "Tim"}).set({name: "Tom"})
      

      This updates the name property of nodes whose name is Tim. The node with _id U001 is updated.

      Update Edges

      update().edges({time > "2021-5-1"}).set({time: dateAdd(time, 1, "day")}) as edges
      return edges{*}
      

      This updates the time property of edges whose time is later than 2021-5-1, to one day after.

      Result:

      _uuid _from _to
      _from_uuid
      _to_uuid
      time
      1 U004 U001 4 1 2021-09-11 00:00:00
      3 U004 U002 4 2 2023-07-31 00:00:00

      Update Start/End Nodes

      update().edges({_uuid == 2}).set({_to: "U002"})
      

      This updates the end node of edge whose_uuid is 2 to node with _id U002.

      Update All Nodes/Edges

      update().nodes().set({age: age + 1}) as n
      return table(n.name, n.age)
      

      Result:

      name age
      Jason 31
      Tom null
      Grace 26
      Ted 27

      Update Limited Nodes/Edges

      update().nodes({@user}).set({name: lower(name)}).limit(2) as nodes
      return nodes{*}
      

      This updates the name property of @user nodes to lowercase characters, but only for two nodes.

      Result:

      _id _uuid name age
      U001 1 jason 31
      U002 2 tom null

      Common Reasons for Failures

      • Update fails when _uuid or _id is included in the set() method, as unique identifier properties cannot be updated.
      • Edge update fails when the specified start node (_from or _from_uuid) or end node (_to or _to_uuid) does not exist in the graph.
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