是否可以在Neo4j/OrientDB中约束边缘多重性? [英] Is it possible to constraint edge multiplicity in Neo4j / OrientDB?

问题描述

我想知道Neo4j和OrientDB是否提供了针对特定边缘类型的多重性来定义约束的可能性?

I was wondering whether Neo4j and OrientDB provide the possibility of defining constraints in terms of multiplicity for specific edge types?

推荐答案

对于OrientDB

您可以为每个标签设置进出集合的多重性.如果边的标签为"workFor"，则设置从人"到公司"的最多1条边的示例:

For OrientDB

You can set multiplicity on out/in collection per label. Example to set maximum 1 edges from Person to Company if the edge's label is "workFor":

ALTER PROPERTY Person.out_workFor NOT NULL
ALTER PROPERTY Person.out_workFor MAX 1

您还可以通过以下方式设置最小值:

You can also set the minimum with:

ALTER PROPERTY Person.out_workFor MIN 1

用min&与公司只有一种关系是强制性的.

In this way with min & max it's mandatory having one and only one relationship to Company.

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