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    Indexes: Indexing Compare Exchange Values

    • Compare exchange values can be loaded within an index using the value's key.

    • The index will update when the compare exchange value is updated, as well as when documents are modified in the indexed collection(s).

    • In this page:

    Syntax

    For javascript indexes, use the method cmpxchg(<key>).
    Parameter Type Description
    key string The key of a particular compare exchange value.


    Examples

    These indexes map the rooms in a hotel, as well as compare exchange values representing the guests in those rooms. 

    class Compare_Exchange_Index extends AbstractCsharpIndexCreationTask {
    constructor() {
        super();

        this.map = `docs.HotelRooms.Select(room => new { 
                         RoomID = room.RoomID,     
                         Guests = cmpxchg(room.RoomID)
                    })`;
    }
}

    Querying the Index 

    const VIPRooms = await session
    .advanced.rawQuery<HotelRoom>(
    "   from Hotelrooms as room\n"+
    "   where room.Guests == cmpxchg('VIP')"
)

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