实践Neo4j之三模型和建模

Posted on | In | Visitors

Node

Vertice，顶点，节点

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Node user1 = graphDb.createNode();
Node user2 = graphDb.createNode();
Node movie1 = graphDb.createNode();

Node

id是neo4j自动生成的

Label

可以理解为Node Type

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public interface Label {
	java.lang.String name();
}

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public enum MyLabels implements Label{
	MOVIES, USERS
}

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movie1.addLabel(MyLabels.MOVIE);

DynamicLabel

动态创建Label

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Label label1 = DynamicLabel.label("MOVIES");

RelationShip

Edge，关系，边

RelationShip

id是neo4j自动生成的

RelationShipType

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public interface RelationshipType{
public String name();
}

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public enum MyRelationshipTypes implements RelationshipType {
    IS_FRIEND_OF,
    HAS_SEEN;
}

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Relationship rel1 = user1.createRelationshipTo(movie1, MyRelationshipTypes.HAS_SEEN);

DynamicRelationshipType

动态创建RelationShipType

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RelationshipType rt1 = DynamicRelationshipType.withName("IS_FRIEND_OF");

Properties

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user1.setProperty("name", "John Johnson");
rel1.setProperty("stars", 4);

在进行图建模时，对于实体、关系和属性的使用要适当权衡。该用属性表示的地方如果硬拆出来用实体表示，则可能会引入过多的实体和关系。一些复杂的场景下难以表达清楚，可能需要额外引入实体和关系。