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v4.0
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    v4.0

      Schema Filter

      Schema filter judges whether the current node/edge belongs to a given schema. Schema filter is often overlaid with property call.

      Syntax:

      • Expression: @<schema>
      • Operand: string

      Schema can only be used in filter, and it cannot be used as experssion alone in an UQL sentence.

      Node

      Example: find and return 10 Cards with their properties

      find().nodes({@card}) as n
      limit 10
      return n{*} 
      

      Analysis: we can also use another expression {@ == "card"}, see Conditional Operators ==.

      Edge

      Example: find and return 10 @transfer egdes with their properties

      find().edges({@transfer}) as e
      limit 10
      return e{*} 
      

      Schema & Property

      Example: find Cards whose balance is over 500000, return 10 cards with all properties.

      find().nodes({@card.balance > 500000}) as n
      limit 10
      return n{*} 
      

      Analysis: this filter can be extended as {@card && balance > 500000}, see Conditional Operators &&.

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