spring boot 2.0 neo4j 使用

参考文档

　　官方文档

• http://spring.io/projects/spring-data-neo4j#learn
• https://docs.spring.io/spring-data/neo4j/docs/5.1.2.RELEASE/reference/html/
• https://neo4j.com/docs/
• https://neo4j.com/docs/developer-manual/current/

　　第三方使用文档

• https://blog.csdn.net/appleyk/article/category/7408344  系列文档
• https://blog.csdn.net/u013946356/article/details/81739079

　　中文手册（比较滞后）

• https://www.w3cschool.cn/neo4j/

安装 maven 包

<dependency>
　　<groupId>org.neo4j</groupId>
　　<artifactId>neo4j-ogm-http-driver</artifactId>
　　<version>3.1.4</version>
</dependency>

<dependency>
　　<groupId>org.springframework.boot</groupId>
　　<artifactId>spring-boot-starter-data-neo4j</artifactId>
　　<version>2.1.0.RELEASE</version>
</dependency>

添加 neo4j 配置

application.yml

spring:
  data:
    neo4j:
      username: neo4j
      password: 1234
      uri: http://172.16.235.175:7474

添加配置类

@Configuration
@EnableNeo4jRepositories(basePackages = "com.example.demo.repository")
@EnableTransactionManagement
public class Neo4jConfig {
@Value(</span>"${spring.data.neo4j.uri}"<span style="color: #000000;">)
</span><span style="color: #0000ff;">private</span><span style="color: #000000;"> String databaseUrl;

@Value(</span>"${spring.data.neo4j.username}"<span style="color: #000000;">)
</span><span style="color: #0000ff;">private</span><span style="color: #000000;"> String userName;

@Value(</span>"${spring.data.neo4j.password}"<span style="color: #000000;">)
</span><span style="color: #0000ff;">private</span><span style="color: #000000;"> String password;

@Bean
</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> SessionFactory sessionFactory() {
    org.neo4j.ogm.config.Configuration configuration </span>= <span style="color: #0000ff;">new</span><span style="color: #000000;"> org.neo4j.ogm.config.Configuration.Builder()
            .uri(databaseUrl)
            .credentials(userName, password)
            .build();
    </span><span style="color: #0000ff;">return</span> <span style="color: #0000ff;">new</span> SessionFactory(configuration, "com.example.demo.entity"<span style="color: #000000;">);
}

@Bean
</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> Neo4jTransactionManager transactionManager() {
    </span><span style="color: #0000ff;">return</span> <span style="color: #0000ff;">new</span><span style="color: #000000;"> Neo4jTransactionManager(sessionFactory());
}

}

添加 Neo4j 节点类

@NodeEntity
public class SGNode {
    private Long count;
    private Long error;
    private Double max;
    private Double min;
</span><span style="color: #008000;">/**</span><span style="color: #008000;">
 * Neo4j会分配的ID（节点唯一标识 当前类中有效）
 </span><span style="color: #008000;">*/</span><span style="color: #000000;">
@Id
@GeneratedValue
</span><span style="color: #0000ff;">private</span><span style="color: #000000;"> Long id;

</span><span style="color: #0000ff;">private</span><span style="color: #000000;"> String name;

</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> Long getId() {
    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> id;
}

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> setId(Long id) {
    </span><span style="color: #0000ff;">this</span>.id =<span style="color: #000000;"> id;
}

</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> String getName() {
    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> name;
}

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> setName(String name) {
    </span><span style="color: #0000ff;">this</span>.name =<span style="color: #000000;"> name;
}

@Relationship(type </span>= "call"<span style="color: #000000;">)
</span><span style="color: #0000ff;">private</span> List&lt;CallRelation&gt;<span style="color: #000000;"> calls;

</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> SGNode() {
    count </span>= 0L<span style="color: #000000;">;
    error </span>= 0L<span style="color: #000000;">;
    max </span>= 0.0<span style="color: #000000;">;
    min </span>= 0.0<span style="color: #000000;">;
    calls </span>= <span style="color: #0000ff;">new</span> ArrayList&lt;&gt;<span style="color: #000000;">();
}

</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> SGNode(String name) {
    </span><span style="color: #0000ff;">this</span><span style="color: #000000;">();
    </span><span style="color: #0000ff;">this</span>.name =<span style="color: #000000;"> name;
}

</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> Long getCount() {
    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> count;
}

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> setCount(Long count) {
    </span><span style="color: #0000ff;">this</span>.count =<span style="color: #000000;"> count;
}

</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> Long getError() {
    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> error;
}

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> setError(Long error) {
    </span><span style="color: #0000ff;">this</span>.error =<span style="color: #000000;"> error;
}

</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> Double getMax() {
    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> max;
}

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> setMax(Double max) {
    </span><span style="color: #0000ff;">this</span>.max =<span style="color: #000000;"> max;
}

</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> Double getMin() {
    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> min;
}

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> setMin(Double min) {
    </span><span style="color: #0000ff;">this</span>.min =<span style="color: #000000;"> min;
}

</span><span style="color: #0000ff;">public</span> List&lt;CallRelation&gt;<span style="color: #000000;"> getCalls() {
    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> calls;
}

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span> setCalls(List&lt;CallRelation&gt;<span style="color: #000000;"> calls) {
    </span><span style="color: #0000ff;">this</span>.calls =<span style="color: #000000;"> calls;
}

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> addCalls(SGNode node, Long count) {
    CallRelation relation </span>= <span style="color: #0000ff;">new</span> CallRelation(<span style="color: #0000ff;">this</span><span style="color: #000000;">, node, count);
    </span><span style="color: #0000ff;">this</span><span style="color: #000000;">.calls.add(relation);
}

}

添加 Neo4j 关系类

@RelationshipEntity(type = "call")
public class CallRelation {
</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> CallRelation() {
    </span><span style="color: #0000ff;">this</span>.name = "call"<span style="color: #000000;">;
}


</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> CallRelation(SGNode start, SGNode end, Long count) {
    </span><span style="color: #0000ff;">this</span><span style="color: #000000;">();
    </span><span style="color: #0000ff;">this</span>.startNode =<span style="color: #000000;"> start;
    </span><span style="color: #0000ff;">this</span>.endNode =<span style="color: #000000;"> end;
    </span><span style="color: #0000ff;">this</span>.count =<span style="color: #000000;"> count;
}

</span><span style="color: #008000;">/**</span><span style="color: #008000;">
 * Neo4j会分配的ID（节点唯一标识 当前类中有效）
 </span><span style="color: #008000;">*/</span><span style="color: #000000;">
@Id
@GeneratedValue
</span><span style="color: #0000ff;">private</span><span style="color: #000000;"> Long id;

</span><span style="color: #0000ff;">private</span><span style="color: #000000;"> String name;

</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> Long getId() {
    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> id;
}

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> setId(Long id) {
    </span><span style="color: #0000ff;">this</span>.id =<span style="color: #000000;"> id;
}

</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> String getName() {
    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> name;
}

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> setName(String name) {
    </span><span style="color: #0000ff;">this</span>.name =<span style="color: #000000;"> name;
}

</span><span style="color: #008000;">/**</span><span style="color: #008000;">
 * 定义关系的起始节点 == StartNode
 </span><span style="color: #008000;">*/</span><span style="color: #000000;">

@StartNode
</span><span style="color: #0000ff;">private</span><span style="color: #000000;"> SGNode startNode;

</span><span style="color: #008000;">/**</span><span style="color: #008000;">
 * 定义关系的终止节点 == EndNode
 </span><span style="color: #008000;">*/</span><span style="color: #000000;">

@EndNode
</span><span style="color: #0000ff;">private</span><span style="color: #000000;"> SGNode endNode;


</span><span style="color: #008000;">/**</span><span style="color: #008000;">
 * 定义关系的属性
 </span><span style="color: #008000;">*/</span><span style="color: #000000;">

@Property(name </span>= "count"<span style="color: #000000;">)
</span><span style="color: #0000ff;">private</span><span style="color: #000000;"> Long count;

</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> SGNode getStartNode() {
    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> startNode;
}

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> setStartNode(SGNode startNode) {
    </span><span style="color: #0000ff;">this</span>.startNode =<span style="color: #000000;"> startNode;
}

</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> SGNode getEndNode() {
    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> endNode;
}

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> setEndNode(SGNode endNode) {
    </span><span style="color: #0000ff;">this</span>.endNode =<span style="color: #000000;"> endNode;
}

</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> Long getCount() {
    </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> count;
}

</span><span style="color: #0000ff;">public</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> setCount(Long count) {
    </span><span style="color: #0000ff;">this</span>.count =<span style="color: #000000;"> count;
}

}

添加 Reponsitory

@Repository
public interface SGNodeReponsitory extends Neo4jRepository<SGNode, Long> {
　　// 此处用法可见 https://docs.spring.io/spring-data/neo4j/docs/5.1.2.RELEASE/reference/html/#_query_methods
    SGNode findByName(@Param("name") String name);
}

使用 Demo

@RestController
@RequestMapping("/sg")
public class SGNodeController {
@Autowired
SGNodeReponsitory sgNodeReponsitory;

@DeleteMapping(</span>"/delete"<span style="color: #000000;">)
</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> String delete() {
    sgNodeReponsitory.deleteAll();
    </span><span style="color: #0000ff;">return</span> "OK"<span style="color: #000000;">;
}

@GetMapping(</span>"/add"<span style="color: #000000;">)
</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> String add() {
    addNodes();
    </span><span style="color: #0000ff;">return</span> "OK"<span style="color: #000000;">;
}

@GetMapping(</span>"/get"<span style="color: #000000;">)
</span><span style="color: #0000ff;">public</span><span style="color: #000000;"> String relation() {
    SGNode node </span>= sgNodeReponsitory.findByName("tsp"<span style="color: #000000;">);
    List</span>&lt;Long&gt; ids = <span style="color: #0000ff;">new</span> ArrayList&lt;&gt;<span style="color: #000000;">();
    ids.add(node.getId());
    Iterable</span>&lt;SGNode&gt; result = sgNodeReponsitory.findAllById(ids, 1<span style="color: #000000;">);
    </span><span style="color: #0000ff;">return</span> "OK"<span style="color: #000000;">;
}


</span><span style="color: #0000ff;">private</span> <span style="color: #0000ff;">void</span><span style="color: #000000;"> addNodes() {
    sgNodeReponsitory.deleteAll();

    List</span>&lt;SGNode&gt; list = <span style="color: #0000ff;">new</span> ArrayList&lt;&gt;<span style="color: #000000;">();

    SGNode node </span>= <span style="color: #0000ff;">new</span> SGNode("tsp"<span style="color: #000000;">);
    list.add(node);

    </span><span style="color: #0000ff;">for</span> (Integer i = 1; i &lt;= 10; i++<span style="color: #000000;">) {
        node </span>= <span style="color: #0000ff;">new</span> SGNode("tsp" +<span style="color: #000000;"> i);
        node.setCount(</span><span style="color: #0000ff;">new</span><span style="color: #000000;"> Random().nextLong());
        node.setError(</span><span style="color: #0000ff;">new</span><span style="color: #000000;"> Random().nextLong());
        node.setMax(</span><span style="color: #0000ff;">new</span><span style="color: #000000;"> Random().nextDouble());
        node.setMin(</span><span style="color: #0000ff;">new</span><span style="color: #000000;"> Random().nextDouble());
        list.add(node);
    }

    sgNodeReponsitory.saveAll(list);

    SGNode start </span>= sgNodeReponsitory.findByName("tsp1"<span style="color: #000000;">);
    SGNode end </span>= sgNodeReponsitory.findByName("tsp"<span style="color: #000000;">);
    start.addCalls(end, </span><span style="color: #0000ff;">new</span><span style="color: #000000;"> Random().nextLong());
    sgNodeReponsitory.save(start);

    start </span>= sgNodeReponsitory.findByName("tsp2"<span style="color: #000000;">);
    end </span>= sgNodeReponsitory.findByName("tsp"<span style="color: #000000;">);
    start.addCalls(end, </span><span style="color: #0000ff;">new</span><span style="color: #000000;"> Random().nextLong());
    sgNodeReponsitory.save(start);

    start </span>= sgNodeReponsitory.findByName("tsp9"<span style="color: #000000;">);
    end </span>= sgNodeReponsitory.findByName("tsp7"<span style="color: #000000;">);
    start.addCalls(end, </span><span style="color: #0000ff;">new</span><span style="color: #000000;"> Random().nextLong());
    sgNodeReponsitory.save(start);

    start </span>= sgNodeReponsitory.findByName("tsp7"<span style="color: #000000;">);
    end </span>= sgNodeReponsitory.findByName("tsp2"<span style="color: #000000;">);
    start.addCalls(end, </span><span style="color: #0000ff;">new</span><span style="color: #000000;"> Random().nextLong());
    sgNodeReponsitory.save(start);

    start </span>= sgNodeReponsitory.findByName("tsp2"<span style="color: #000000;">);
    end </span>= sgNodeReponsitory.findByName("tsp8"<span style="color: #000000;">);
    start.addCalls(end, </span><span style="color: #0000ff;">new</span><span style="color: #000000;"> Random().nextLong());
    sgNodeReponsitory.save(start);

    start </span>= sgNodeReponsitory.findByName("tsp"<span style="color: #000000;">);
    end </span>= sgNodeReponsitory.findByName("tsp3"<span style="color: #000000;">);
    start.addCalls(end, </span><span style="color: #0000ff;">new</span><span style="color: #000000;"> Random().nextLong());
    sgNodeReponsitory.save(start);

    start </span>= sgNodeReponsitory.findByName("tsp"<span style="color: #000000;">);
    end </span>= sgNodeReponsitory.findByName("tsp4"<span style="color: #000000;">);
    start.addCalls(end, </span><span style="color: #0000ff;">new</span><span style="color: #000000;"> Random().nextLong());
    sgNodeReponsitory.save(start);

    start </span>= sgNodeReponsitory.findByName("tsp6"<span style="color: #000000;">);
    end </span>= sgNodeReponsitory.findByName("tsp3"<span style="color: #000000;">);
    start.addCalls(end, </span><span style="color: #0000ff;">new</span><span style="color: #000000;"> Random().nextLong());
    sgNodeReponsitory.save(start);

    start </span>= sgNodeReponsitory.findByName("tsp3"<span style="color: #000000;">);
    end </span>= sgNodeReponsitory.findByName("tsp5"<span style="color: #000000;">);
    start.addCalls(end, </span><span style="color: #0000ff;">new</span><span style="color: #000000;"> Random().nextLong());
    sgNodeReponsitory.save(start);

    start </span>= sgNodeReponsitory.findByName("tsp5"<span style="color: #000000;">);
    end </span>= sgNodeReponsitory.findByName("tsp10"<span style="color: #000000;">);
    start.addCalls(end, </span><span style="color: #0000ff;">new</span><span style="color: #000000;"> Random().nextLong());
    sgNodeReponsitory.save(start);
}

}

执行 Add 操作之后 

原文地址：https://www.cnblogs.com/fengqiaoyebo/p/9952111.html