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我正在學習使用Gremlin,並剛剛開始使用命令行製作基本圖形。我已經瞭解到,我可以把它放到一個腳本中,這基本上只是一堆groovy(我也剛剛熟悉)。我運行下面的腳本,並且一旦腳本完成運行(除了所有關於所做的節點/邊的正確消息),我就會得到`==> null',一切都很好。我做錯了什麼?爲什麼gremlin在我的腳本中輸出「null」?
graph = TinkerGraph.open()
g = graph.traversal()
//The nodes
curCharge = graph.addVertex(id, 1, label, "Topic", "name","Current")
pow = graph.addVertex(id, 2, label, "Topic", "name","power")
powFromNRG = graph.addVertex(id, 3, label, "Topic", "name","powerFromNRG")
NRGFromPower = graph.addVertex(id, 4, label, "Topic", "name","NRGFromPower")
powFromVI = graph.addVertex(id,5,label,"Topic","name","powerFromIV")
powInRes = graph.addVertex(id,6,label,"Topic","name","powerInResistors")
passSign = graph.addVertex(id,7,label,"Topic","name","passiveSignPower")
ohmLaw = graph.addVertex(id,8,label,"Topic","name","ohmsLaw")
//the pre-requisite edges
pow.addEdge("prereq",powFromNRG)
pow.addEdge("prereq",NRGFromPower)
pow.addEdge("prereq",powFromVI)
powFromVI.addEdge("prereq",passSign)
passSign.addEdge("prereq",powInRes)
ohmLaw.addEdge("prereq",powInRes)
//just some test queries
nL = g.V().has("name","passiveSignPower").inE("prereq").outV()
if(nL != null)
println "Hey!"
謝謝!我玩過這些教程,但一定錯過了那部分。我發現Gremlin的文檔有兩種類型 - 更簡單,教程內容和API本身。有沒有另外一個參考文件可以更詳細地解釋事情,而不需要rtfm? –
有趣的問題。我知道參考文檔很大,教程可能有點難找。您在填補文檔空白方面想到了什麼?在gremlin-users郵件列表中進行這種對話可能會更好,而不是SO評論。 –
好主意,我會檢查郵件列表。我主要對將Gremlin包含在Java項目中感興趣。我猜,我也會在Groovy中做到這一點。最終,我需要能夠將我的Gremlin查詢的結果輸出到程序中,以便與他們一起完成任務,並且目前看不到這種方法,這很容易 –