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v4.0
    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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