Spring Boot整合neo4j
作者:mmseoamin日期:2023-12-21

Neo4 j概览

Spring Boot整合neo4j,第1张

相关版本信息

jdk 1.8
neo4j-enterprise-3.5.35
idea 2021
maven 3.6.3

SpringBoot整合neo4j实操

1、配置文件

Pom文件中引入依赖 Spring生态中Spring-data部分不仅仅提供了Spring-data-jpa , 也提供了Spring-data-neo4j 支持spring和 neo4j的完美融合,pom.xml 文件中依赖

        
            org.springframework.boot
            spring-boot-starter-data-neo4j
        

yml文件中配置连接属性

spring:
  data:
    neo4j:
      uri: bolt://localhost:7687
      username: neo4j
      password: 123
#打印neo4j生成的Cypher
logging:
  level:
    org:
      neo4j:
        ogm:
          drivers:
            bolt:
              request:
                BoltRequest: DEBUG
​

2、实体类(NodeEntity)

/**
*部门节点实体类
*/
@NodeEntity(label = "Dept")
@Data
@Builder
public class Dept {
​
    @Id
    @GeneratedValue
    private Long id;
​
    @Property(name = "deptName")
    private String deptName;
​
}
/**
*关系 实体类
*/
@RelationshipEntity(type = "relationShip")
@Data
@Builder
public class RelationShip {
​
    @Id
    @GeneratedValue
    private Long id;
​
    @StartNode
    private Dept parent;
​
    @EndNode
    private Dept child;
}   

@NodeEntity: 标明是一个节点实体@RelationshipEntity:标明是一个关系实体@Id:实体主键@Property:实体属性@GeneratedValue:实体属性值自增@StartNode:开始节点(可以理解为父节点)@EndNode:结束节点(可以理解为子节点)、

3、创建repositories类(类似于封装过的dao)

@Repository
public interface DeptRepository extends Neo4jRepository {
​
    @Query("MATCH (d:dept) WHERE d.deptName CONTAINS $title RETURN d")
    List findByTitle(@Param("title") String title);
}

@Query:编写neo4j 的Cypher语句, 变量格式为$

源码解析:Neo4jRepository.class

@NoRepositoryBean
public interface Neo4jRepository extends PagingAndSortingRepository {
     S save(S var1, int var2);
​
     Iterable save(Iterable var1, int var2);
​
    Optional findById(ID var1, int var2);
​
    Iterable findAll();
​
    Iterable findAll(int var1);
​
    Iterable findAll(Sort var1);
​
    Iterable findAll(Sort var1, int var2);
​
    Iterable findAllById(Iterable var1);
​
    Iterable findAllById(Iterable var1, int var2);
​
    Iterable findAllById(Iterable var1, Sort var2);
​
    Iterable findAllById(Iterable var1, Sort var2, int var3);
​
    Page findAll(Pageable var1);
​
    Page findAll(Pageable var1, int var2);
}

Neo4jRepository已经经过多层封装,包含了实现了crud基本功能外,再集成了分页功能,之后提炼了常用查询的方法,提高了代码复用性。

4、创建Neo4jConfig配置

package io.fredia.femicro.graph.config;
​
import org.springframework.context.annotation.Configuration;
import org.springframework.data.neo4j.repository.config.EnableNeo4jRepositories;
import org.springframework.transaction.annotation.EnableTransactionManagement;
​
@Configuration
@EnableNeo4jRepositories(basePackages = "com.example.demo.repository")
@EnableTransactionManagement // 激活隐式事务
public class Neo4jConfig {
}

注解解析:@Configuration: springboot声明配置类,一般为单例模式@EnableNeo4jRepositories: Neo4j扫描Repositories所在包,可以理解为mybatis扫描mapper包@EnableTransactionManagement: Neo4j完整的支持ACID,所以此处开启事务功能。

5、编写Service类

@Service
public class DeptService {
​
    @Autowired
    private DeptRepository deptRepository;
​
    public Iterable saveAll(List depts) {
        return deptRepository.saveAll(depts);
    }
​
    public void deleteById(Long id) {
        deptRepository.deleteById(id);
    }
​
    public void deleteAll() {
        deptRepository.deleteAll();
    }
​
    public List findByTitle(String title) {
        return deptRepository.findByTitle(title);
    }
}

6、编写Controller类

@RestController
public class TestController {
​
    @Autowired
    private DeptService deptService;
​
    @Autowired
    private RelationShipService relationShipService;
​
    /**
     * CEO
     *    -设计部
     *        - 设计1组
     *        - 设计2组
     *    -技术部
     *        - 前端技术部
     *        - 后端技术部
     *        - 测试技术部
     */
    @GetMapping("/create")
    public void create(){
        Dept CEO = Dept.builder().deptName("CEO").build();
        Dept dept1 = Dept.builder().deptName("设计部").build();
        Dept dept11 = Dept.builder().deptName("设计1组").build();
        Dept dept12 = Dept.builder().deptName("设计2组").build();
​
        Dept dept2 = Dept.builder().deptName("技术部").build();
        Dept dept21 = Dept.builder().deptName("前端技术部").build();
        Dept dept22 = Dept.builder().deptName("后端技术部").build();
        Dept dept23 = Dept.builder().deptName("测试技术部").build();
        List depts = new ArrayList<>(Arrays.asList(CEO,dept1,dept11,dept12,dept2,dept21,dept22,dept23));
        deptService.saveAll(depts);
​
        RelationShip relationShip1 = RelationShip.builder().parent(CEO).child(dept1).build();
        RelationShip relationShip2 = RelationShip.builder().parent(CEO).child(dept2).build();
        RelationShip relationShip3 = RelationShip.builder().parent(dept1).child(dept11).build();
        RelationShip relationShip4 = RelationShip.builder().parent(dept1).child(dept12).build();
        RelationShip relationShip5 = RelationShip.builder().parent(dept2).child(dept21).build();
        RelationShip relationShip6 = RelationShip.builder().parent(dept2).child(dept22).build();
        RelationShip relationShip7 = RelationShip.builder().parent(dept2).child(dept23).build();
        List relationShips = new ArrayList<>(Arrays.asList(relationShip1,relationShip2,relationShip3,relationShip4,relationShip5
                ,relationShip6,relationShip7));
        relationShipService.saveAll(relationShips);
    }
​
    @GetMapping("getById")
    public RelationShip getById(Long id){
        Optional byId = relationShipService.findById(id);
        return byId.orElse(null);
    }
​
    @GetMapping("deleteRelationShip")
    public void deleteRelationShip(Long id){
        relationShipService.deleteById(id);
    }
​
    @GetMapping("deleteDept")
    public void deleteDept(Long id){
        deptService.deleteById(id);
    }
​
    @GetMapping("deleteAll")
    public void deleteAll(){
        deptService.deleteAll();
        relationShipService.deleteAll();
    }
    @GetMapping("getByTitle")
    public List getByTitle(@RequestParam("title") String title){
        return deptService.findByTitle(title);
    }
}

测试结果

启动项目 访问本地地址:实现新增功能

http://localhost:8088/create

登录本机的Neo4j :localhost:7474

查看Neo4j 数据库内容: Spring Boot整合neo4j,第2张

访问本地地址:通过Cypher语句实现查询功能

http://localhost:8088/getByTitle?title=技术

控制台打印日志: Spring Boot整合neo4j,第3张

查看Neo4j 数据库内容: Spring Boot整合neo4j,第4张