Spring Data Neo4j使用@RelationshipProperties和@TargetNode实现关系实体

5jdjgkvh 于 2023-04-06 发布在 Spring

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我有以下旧关系实体，我想升级到最新的SDN @RelationshipProperties和@TargetNode：

@RelationshipEntity(type = "HAS_VALUE_ON")
public class RelationshipValue {

    @Id
    @GeneratedValue
    private Long graphId;

    @StartNode
    private Decision decision;

    @EndNode
    private Characteristic characteristic;

你能展示一下如何用@RelationshipProperties和@TargetNode注解实现它吗？

neo4j

来源：https://stackoverflow.com/questions/67558448/spring-data-neo4j-implement-relationship-entity-with-relationshipproperties-and

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按热度按时间

2hh7jdfx1#

带有属性的关系不再指向两个实体，而是一个有向关系。我们不做任何假设，如果TargetNode是结束或开始节点。这是在关系定义类中定义的。
假设RelationshipValue在Decision中使用，并且它应该连接到Characteristic，您可以定义如下内容：

@RelationshipProperties
public class RelationshipValue {

    @Id
    @GeneratedValue
    private Long graphId;

    @TargetNode
    private Characteristic characteristic;

并且在Decision中：

public class Decision {

    @Relationship("HAS_VALUE_ON") // direction can be OUTGOING (default) or INCOMING
    private RelationshipValue relationshipValue;
}

x-post：https://community.neo4j.com/t/spring-data-neo4j-implement-relationship-entity-with-relationshipproperties-and-targetnode/38429/2?u=gerrit.meier

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Spring Data Neo4j使用@RelationshipProperties和@TargetNode实现关系实体

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