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("${spring.data.neo4j.uri}")

private String databaseUrl;
@Value("${spring.data.neo4j.username}")

private String userName;
@Value("${spring.data.neo4j.password}")

private String password;
@Bean

public SessionFactory sessionFactory() {

org.neo4j.ogm.config.Configuration configuration = new org.neo4j.ogm.config.Configuration.Builder()

.uri(databaseUrl)

.credentials(userName, password)

.build();

return new SessionFactory(configuration, "com.example.demo.entity");

}
@Bean

public Neo4jTransactionManager transactionManager() {

return new Neo4jTransactionManager(sessionFactory());

}

}

添加 Neo4j 节点类

@NodeEntity
public class SGNode {
    private Long count;
    private Long error;
    private Double max;
    private Double min;
/**

* Neo4j会分配的ID（节点唯一标识 当前类中有效）

*/

@Id

@GeneratedValue

private Long id;
private String name;
public Long getId() {

return id;

}
public void setId(Long id) {

this.id = id;

}
public String getName() {

return name;

}
public void setName(String name) {

this.name = name;

}
@Relationship(type = "call")

private List<CallRelation> calls;
public SGNode() {

count = 0L;

error = 0L;

max = 0.0;

min = 0.0;

calls = new ArrayList<>();

}
public SGNode(String name) {

this();

this.name = name;

}
public Long getCount() {

return count;

}
public void setCount(Long count) {

this.count = count;

}
public Long getError() {

return error;

}
public void setError(Long error) {

this.error = error;

}
public Double getMax() {

return max;

}
public void setMax(Double max) {

this.max = max;

}
public Double getMin() {

return min;

}
public void setMin(Double min) {

this.min = min;

}
public List<CallRelation> getCalls() {

return calls;

}
public void setCalls(List<CallRelation> calls) {

this.calls = calls;

}
public void addCalls(SGNode node, Long count) {

CallRelation relation = new CallRelation(this, node, count);

this.calls.add(relation);

}

}

添加 Neo4j 关系类

@RelationshipEntity(type = "call")
public class CallRelation {
public CallRelation() {

this.name = "call";

}
public CallRelation(SGNode start, SGNode end, Long count) {

this();

this.startNode = start;

this.endNode = end;

this.count = count;

}
/**

* Neo4j会分配的ID（节点唯一标识 当前类中有效）

*/

@Id

@GeneratedValue

private Long id;
private String name;
public Long getId() {

return id;

}
public void setId(Long id) {

this.id = id;

}
public String getName() {

return name;

}
public void setName(String name) {

this.name = name;

}
/**

* 定义关系的起始节点 == StartNode

*/
@StartNode

private SGNode startNode;
/**

* 定义关系的终止节点 == EndNode

*/
@EndNode

private SGNode endNode;
/**

* 定义关系的属性

*/
@Property(name = "count")

private Long count;
public SGNode getStartNode() {

return startNode;

}
public void setStartNode(SGNode startNode) {

this.startNode = startNode;

}
public SGNode getEndNode() {

return endNode;

}
public void setEndNode(SGNode endNode) {

this.endNode = endNode;

}
public Long getCount() {

return count;

}
public void setCount(Long count) {

this.count = 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("/delete")

public String delete() {

sgNodeReponsitory.deleteAll();

return "OK";

}
@GetMapping("/add")

public String add() {

addNodes();

return "OK";

}
@GetMapping("/get")

public String relation() {

SGNode node = sgNodeReponsitory.findByName("tsp");

List<Long> ids = new ArrayList<>();

ids.add(node.getId());

Iterable<SGNode> result = sgNodeReponsitory.findAllById(ids, 1);

return "OK";

}
private void addNodes() {

sgNodeReponsitory.deleteAll();
List<SGNode> list = new ArrayList<>();
SGNode node = new SGNode("tsp");

list.add(node);
for (Integer i = 1; i <= 10; i++) {

node = new SGNode("tsp" + i);

node.setCount(new Random().nextLong());

node.setError(new Random().nextLong());

node.setMax(new Random().nextDouble());

node.setMin(new Random().nextDouble());

list.add(node);

}
sgNodeReponsitory.saveAll(list);
SGNode start = sgNodeReponsitory.findByName("tsp1");

SGNode end = sgNodeReponsitory.findByName("tsp");

start.addCalls(end, new Random().nextLong());

sgNodeReponsitory.save(start);
start = sgNodeReponsitory.findByName("tsp2");

end = sgNodeReponsitory.findByName("tsp");

start.addCalls(end, new Random().nextLong());

sgNodeReponsitory.save(start);
start = sgNodeReponsitory.findByName("tsp9");

end = sgNodeReponsitory.findByName("tsp7");

start.addCalls(end, new Random().nextLong());

sgNodeReponsitory.save(start);
start = sgNodeReponsitory.findByName("tsp7");

end = sgNodeReponsitory.findByName("tsp2");

start.addCalls(end, new Random().nextLong());

sgNodeReponsitory.save(start);
start = sgNodeReponsitory.findByName("tsp2");

end = sgNodeReponsitory.findByName("tsp8");

start.addCalls(end, new Random().nextLong());

sgNodeReponsitory.save(start);
start = sgNodeReponsitory.findByName("tsp");

end = sgNodeReponsitory.findByName("tsp3");

start.addCalls(end, new Random().nextLong());

sgNodeReponsitory.save(start);
start = sgNodeReponsitory.findByName("tsp");

end = sgNodeReponsitory.findByName("tsp4");

start.addCalls(end, new Random().nextLong());

sgNodeReponsitory.save(start);
start = sgNodeReponsitory.findByName("tsp6");

end = sgNodeReponsitory.findByName("tsp3");

start.addCalls(end, new Random().nextLong());

sgNodeReponsitory.save(start);
start = sgNodeReponsitory.findByName("tsp3");

end = sgNodeReponsitory.findByName("tsp5");

start.addCalls(end, new Random().nextLong());

sgNodeReponsitory.save(start);
start = sgNodeReponsitory.findByName("tsp5");

end = sgNodeReponsitory.findByName("tsp10");

start.addCalls(end, new Random().nextLong());

sgNodeReponsitory.save(start);

}

}

执行 Add 操作之后 

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