Neo4j开发

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#spring boot #neo4j #java

于 2023-07-17 14:49:30 首次发布

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本文介绍了如何在SpringBoot应用中整合Neo4j数据库，包括添加依赖、配置连接信息，以及创建节点和关系的实体类，还有定义Repository进行数据操作。示例展示了节点和下游关系的实体定义，以及对应的Repository接口和Service实现。

原生API

待补充。。。

SpringBoot整合Neo4j

参考

Springboot集成Neo4j_喝醉的咕咕鸟的博客-优快云博客
SpringBoot 整合 Neo4j_springboot neo4j_$懒小猿$的博客-优快云博客
spring-boot集成neo4j - 知乎
【最新】Neo4j官方建议Spring Boot 2.4.及以上版本用Neo4j Java Driver代替The Spring Boot starter_spring boot_学到一寸是一寸-华为云开发者联盟

依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-Neo4j</artifactId>
</dependency>

配置

spring:
  data:
    neo4j:
      uri: bolt://127.0.0.1:7687
      username: neo4j
      password: neo4j

类似于jpa模式，同样是构建 model 层、repository 层，然后在此基础上操作自定义或模板方法。

实体类

节点

@Data
@NodeEntity(label = "Node")
public class Node {
    @Id
    @GeneratedValue
    private Long id;
 
    @Property(name = "name")
    private String name;
 
    @Property(name = "title")
    private String title;
}

关联关系类

@Data
@RelationshipEntity(type = "DOWNSTREAM_OF")
public class DownstreamOfRelationShip {
    @Id
    @GeneratedValue
    private Long id;
 
    @StartNode
    private Node startNode;
 
    @EndNode
    private Node endNode;
 
    @Property("relation_ship_id")
    private String relationShipId;
}

@Data
@RelationshipEntity(type = "SON_OF")
public class SonOfRelationShip {

    @Id
    @GeneratedValue
    private Long id;

    @StartNode
    private Node startNode;

    @EndNode
    private Node endNode;

    @Property("relation_ship_id")
    private String relationShipId;
}

使用

第一种直接返回关系类

dao层

@Repository
public interface NodeRepository extends Neo4jRepository<Node,Long> {
    @Query("MATCH p=(n:Node) RETURN p")
    List<Node> selectAll();
 
    @Query("MATCH(p:Node{name:{name}}) return p")
    Node findByName(String name);
	
	@Query("MATCH DownstreamOfRelationShip = (c:Node)-[r]->(p:Node) where type(r) = {relationName} return DownstreamOfRelationShip ")
	List<DownstreamOfRelationShip> findRelationship(@Param("relationName") String relationName);
}

第二种返回自定义类

定义一个类Relationship ，这里要注意，需要在类上添加注解@QueryResult，代表了Neo4j查询结果返回的类，注解不加的话会接收不到返回数据。

自定义类

@Data
@QueryResult
public class RelationShip {
    @Id
    @GeneratedValue
    private Long id;

    @StartNode
    private Node startNode;

    @EndNode
    private Node endNode;

    @Property("relation_ship_id")
    private String relationShipId;

    @Property("relation_ship_type")
    private String relationShipType;
}

dao层

@Repository
public interface NodeRepository extends Neo4jRepository<Node,Long> {

	@Query("MATCH data=(endNode:Node{id:$endNodeId})<-[line:SON_OF|DOWNSTREAM_OF*1..]-(startNode) UNWIND line as linel  with DISTINCT linel  RETURN startNode(linel) as startNode ,endNode(linel) as endNode,id(linel) as id,type(linel) as relation_ship_type,linel.relation_ship_id as relation_ship_id ")
    List<RelationShip> findTopologyByDeviceId(@Param("endNodeId") String endNodeId);
}

参考：https://www.modb.pro/db/55683

service

@Slf4j
@Service
public class NodeServiceImpl implements NodeService {

    @Autowired
    private NodeRepository nodeRepository;


    @Override
    public  Node addNode(Node node) {
        Node node = nodeRepository.save(node);
        return node ;
    }

    public Node findNode(String name) {
        Node node = nodeRepository.findByName(name);
        return node;
    }
}