Spring 关系实体的数据 Neo4j 存储库

Question

我希望像查询 NodeEntity 一样查询 RelationshipEntity。

包装信息：

groupId=org.springframework.data
artifactId=spring-data-neo4j
version=5.1.5.RELEASE

我已经在下面发布了虚拟代码。只要概念清楚，如有错误或错误，请不要介意。

节点实体 (1) -> 员工

@NodeEntity("Employee")
public class Employee{

    @Id
    @GeneratedValue
    Long id;
    String name;

    // Id
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    // Name
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    @Relationship(type = STARTED, direction = Relationship.OUTGOING)
    private List<Status> starts = new ArrayList<>();

    @Relationship(type = PAUSED, direction = Relationship.OUTGOING)
    private List<Status> pause = new ArrayList<>();

    @Relationship(type = STOPED, direction = Relationship.OUTGOING)
    private List<Status> stops = new ArrayList<>();

    @Relationship(type = COMPLETED, direction = Relationship.OUTGOING)
    private List<Status> action = new ArrayList<>();

    // Default Relationship
    @Relationship(type = ACTION, direction = Relationship.OUTGOING)
    private List<Status> action = new ArrayList<>();
}

节点实体 (2) -> 项目

@NodeEntity("Project")
public class Project{

    @Id
    @GeneratedValue
    Long id;
    String name;

    // Id
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    // Name
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

关系实体 -> 状态

@RelationshipEntity
public class Status {

    @Id
    @GeneratedValue
    Long id;
    String name;

    // Id
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    // Name
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    @StartNode
    private Employee employee;

    @EndNode
    private Project project;
}

这个存储库工作得很好

public interface EmployeeRepository extends CrudRepository<Employee, Long> {
    Employee findByName(String name);

    @Query("MATCH (e:Employee)-[r]->(p:Project) WHERE e.name={empName} AND p.name={prjName} RETURN e ")
    Employee getEmployeeWorkingOnProjectId(@Param("empName") String empName, @Param("prjName") String prjName);
}

这个存储库不工作。
getEmployeeWorkingOnProject(String,String) returns NULL

I have made modifications after RETURN keyword, for example modifying it from RETURN * to the alias like RETURN e,r,p and also tried changing the sequence of the alias in the return as well.

I wish to get all the status (edges) associated with the specific employee and the specific project.

public interface StatusRepository extends CrudRepository<Status, Long> {

    @Query("MATCH (e:Employee)-[r]->(p:Project) WHERE e.name={empName} AND p.name={prjName} RETURN * ")
    Status getEmployeeWorkingOnProject(@Param("empName") String empName, @Param("prjName") String prjName);


    /* OR 
    @Query("MATCH (e:Employee)-[r]->(p:Project) WHERE e.name={empName} AND p.name={prjName} AND r.name={statusName} RETURN * ")
    Status getEmployeeWorkingOnProject(@Param("empName") String empName, @Param("prjName") String prjName, @Param("statusName") String statusName)
    */
}

Neo4j 浏览器中的 CYPHER 结果:

（用测试图像替换了真实项目图像）

期望的结果（例如）

{
  Status: {
    name: ..,
    Employee: {
      ...
    },
    Project: {
      ...
    }
  }
},
{
  Status: {
    name: ..,
    Employee: {
      ...
    },
    Project: {
      ...
    }
  }
},
..

或

STARTED : {
  Employee: {
    ...
  },
  Project: {
    ...
  }
},
STOPPED : {
  Employee: {
    ...
  },
  Project: {
    ...
  }
},

或其他类型的类似结果，其中关系实体包含两个连接节点。

Answer 1

从下面提到的 Employee (Model/Entity) 中删除特定代码后，我能够使 StatusRepository 工作：

    @Relationship(type = STARTED, direction = Relationship.OUTGOING)
    private List<Status> starts = new ArrayList<>();

    @Relationship(type = PAUSED, direction = Relationship.OUTGOING)
    private List<Status> pause = new ArrayList<>();

    @Relationship(type = STOPED, direction = Relationship.OUTGOING)
    private List<Status> stops = new ArrayList<>();

    @Relationship(type = COMPLETED, direction = Relationship.OUTGOING)
    private List<Status> action = new ArrayList<>();

    // Default Relationship
    @Relationship(type = ACTION, direction = Relationship.OUTGOING)
    private List<Status> action = new ArrayList<>();

Spring 关系实体的数据 Neo4j 存储库

Spring Data Neo4j Repository for Relationship Entity

java

spring-data

spring-data-neo4j

期望的结果（例如）