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v4.2
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v4.2

    Schema Checker

    @ judges whether the current node/edge belongs to a given schema, and is often overlaid with property call.

    • Expression: @<schema>
    • Operand: string constant

    Schema checker exists only in Ultipa filter, and cannot appear as an expression in a UQL clause.

    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 edges 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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