Question

我正在使用Spring Data Neo4j 4（SDN4），并试图使用@QueryResult返回多个实体

没有抛出异常，但@QueryResult对象中的所有内容都为null 该模型很简单，如（：用户） - [：ROLE] - （：角色）

有人知道根本原因是什么吗？

用户模型

@NodeEntity
public class User implements UserDetails {

    @GraphId
    private Long id;

    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }

    private String userId; 

    @Relationship(type="ROLE")
    private Set<Role> roles = new HashSet<>();   

    public ADUser getaDUser() {
        return aDUser;
    }
    public void setaDUser(ADUser aDUser) {
        this.aDUser = aDUser;
    }
    public String getUserId() {
        return userId;
    }

    public void setUserId(String userId) {
        this.userId = userId;
    }

    public Set<Role> getRoles() {
        return roles;
    }

    public void setRoles(Set<Role> roles) {
        this.roles = roles;
    }



}

角色模型

@NodeEntity
public class Role implements java.io.Serializable {

    @GraphId Long id;

    private String name;

    public Role(){}
    public Role(String name){
        this.name = 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;
    }
    @Override
    public String toString() {
        return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);
    }

}

QueryResult

@QueryResult
public class UserPermission {

     private User user;
     private  List<Role> roles;

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public List<Role> getRoles() {
        return roles;
    }

    public void setRoles(List<Role> roles) {
        this.roles = roles;
    }

    @Override
    public String toString() {
        return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);
    }
}

UserRepository

public interface UserRepository extends  GraphRepository<User>{

    public User findByUserId(String userId);

    @Query(" Match (u:User)-[:ROLE]->(r) return u as user , collect(r) as roles ")
    public UserPermission findUserWithRoles();

}

日志是

        2015-08-05 17:56:18 INFO  Neo4jSession:461 - --------- new request ----------
2015-08-05 17:56:18 INFO  Neo4jSession:461 - getOrCreateTransaction() being called on thread: 1
2015-08-05 17:56:18 INFO  Neo4jSession:461 - Session identity: org.neo4j.ogm.session.delegates.TransactionsDelegate@1dcfae07
2015-08-05 17:56:18 INFO  Neo4jSession:461 - There is no existing transaction, creating a transient one
2015-08-05 17:56:18 INFO  DefaultRequest:57 - POST http://localhost:7474/db/data/transaction/commit, request: {"statements":[{"statement":"Match (u:User)-[:ROLE]->(r) return u as user , collect(r) as roles","parameters":{},"resultDataContents":["row"],"includeStats":false}]}
2015-08-05 17:56:18 INFO  DefaultRequest:86 - Response is OK, creating response handler
2015-08-05 17:56:18 WARN  SingleUseEntityMapper:97 - Unable to find property: roles on class: model.UserPermission for writing
2015-08-05 17:56:18 WARN  SingleUseEntityMapper:97 - Unable to find property: user on class: model.UserPermission for writing
2015-08-05 17:56:18 INFO  JsonResponse:103 - Closing HttpResponse

Answer 1

目前还没有人支持将实体映射到@QueryResult。因此，您不必返回User和Role，而是必须返回用户ID和角色ID，然后使用load来补充它们。< / p>

或者，如果您正在寻找一种按角色查找用户的简单方法，您可以尝试一种方法，例如 List<User> findByRolesName(String roleName)

上的UserRepository

@QueryResult不起作用

1 个答案: