SpringBoot：整合Neo4j

官方文档：https://docs.spring.io/spring-data/neo4j/docs/5.1.8.RELEASE/reference/html/#reference

因为本人服务器端neo4j版本是3，所以springboot版本就降低了。

如果你的neo4j版本是4，那么需要提高springboot版本。此外部分注解以及配置都已发生变化，你可以参考最新的springdata官方文档。

依赖：

     <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

	<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-neo4j</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.24</version>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter</artifactId>
            <version>RELEASE</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

application.yml：

spring:
  data:
    neo4j:
      uri: bolt://192.168.40.128:7687
      username: neo4j
      password: XXXXXXXXXXXX

创建实体类：

@Data
@NodeEntity("Person")
public class Person {

    @Id
    @GeneratedValue
    private Long id;
    @Property("cid")
    private int pid;
    @Property
    private String name;
    private String character;
    private double money;
    private int gender;
    private int age;
    private String description;
    @Relationship(type = "Friends",direction = Relationship.INCOMING)
    private Set<Person> relationPersons;
}

创建PersonRepository:

public interface PersonRepository extends Neo4jRepository<Person, Long> {

    @Query("match(p:Person) where p.money > {0} return p")
    List<Person> personList(double money);

    /** 指定开始的名字 和 结束的名字 查询最短路径 限定深度为4以层包含4*/
    @Query("MATCH p=shortestPath((person:Person {name:{0}})-[*1..4]- (person2:Person {name:{1}}) ) RETURN p")
    List<Person> shortestPath(String startName, String endName);
}

测试：

@SpringBootTest
class BootNoe4jApplicationTests {

    @Autowired
    PersonRepository personRepository;

    @Test
    void contextLoads() {
        Iterable<Person> all = personRepository.findAll();
        for (Person person : all) {
            System.out.println(person);
        }
    }

    @Test
    void contextLoads2() {
        Iterable<Person> all = personRepository.personList(0D);
        for (Person person : all) {
            System.out.println(person);
        }
    }

    @Test
    void contextLoads3() {
        Iterable<Person> all = personRepository.shortestPath("范闲", "叶灵儿");
        for (Person person : all) {
            System.out.println(person);
        }
    }
}