如何在Gremlin上更新几个顶点属性? [英] How to update several vertex properties on Gremlin?

问题描述

我想在一个顶点上添加几个属性.我可以做到:

I want to add several properties on a vertex. I could do:

g.v(1).firstname='Marko'
g.v(1).lastname='Rodriguez'

但是如何在单个查询中使用以下哈希值{firstname:'Marko'，lastname:'Rodriguez'}添加这些属性?

But how to add these properties with the following hash {firstname:'Marko', lastname:'Rodriguez'} in a single query?

推荐答案

您可以构建一个有效的SideEffect管道.在简单的情况下，请执行以下操作:

You can construct a SideEffect pipe that would work. In the simple case, do this:

g.v(1)._().sideEffect{it.firstname='Marko'; it.lastname='Rodriguez'}

或者，如果您只需要在一个节点上工作并拥有地图，则可以使用地图的each方法:

Alternatively, if you need to work on just one node and have the map you can use the each method of a map:

m = [firstname:'Marko', lastname:'Rodriguez']
m.each{g.v(1).setProperty(it.key, it.value)}

或者您可以在管道中执行此操作，在该管道中您具有要设置的值的散列.再一次，我们将使用sideEffect管道.因为闭包内部有一个闭包，所以我们需要将it的值从第一个闭包别名到其他名称(在本例中为tn，是此节点"的缩写)，因此可以在第二个闭包中访问它. :

Or you could do this inside of a pipe where you have a hash with values you wish to set. Once again, we'll use the sideEffect pipe. Because there is a closure inside of a closure we need to alias the value of it from the first closure to something else, in this case tn, short for "this node", so it is accessible in the second closure.:

g = new TinkerGraph()
g.addVertex()
g.addVertex()
m = ['0': [firstname: 'Marko', lastname: 'Rodriguez'], '1': [firstname: 'William', lastname: 'Clinton']]
g.V.sideEffect{tn = it; m[tn.id].each{tn.setProperty(it.key, it.value)}}

这将产生以下结果:

gremlin> g.v(0).map
==>lastname=Rodriguez
==>firstname=Marko
gremlin> g.v(1).map
==>lastname=Clinton
==>firstname=William

使用此方法的一个潜在陷阱是，您需要记住顶点ID是字符串，而不是整数，因此请确保正确引用它们.

One potential gotcha with this method is that you need to remember that vertex id's are strings, not integers, so make sure to quote them appropriately.

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