java - @rid 东方数据库中的哪种数据类型？

Question

我尝试使用java从orientdb获取所有数据。 我的代码是

    public static ArrayList<dbentity.DoctorEntity> viewAllDoctor(){
    graph = factory.getTx();
    ArrayList<dbentity.DoctorEntity> al=new ArrayList<dbentity.DoctorEntity>();
    for (Vertex v : graph.getVerticesOfClass("DoctorA")) {
        System.out.println(v.getProperty("@rid"));
        dbentity.DoctorEntity disent=new DoctorEntity(v.getProperty("@rid"), v.getProperty("NAME"),v.getProperty("specialization"));
        al.add(disent);
    }
    graph.shutdown();
    return al;
    }

我想将 @rid 添加到 ArrayList 但它显示错误。我认为数据类型有问题 我的 DoctorEntity 类是。

public class DoctorEntity {
private String name;
private String specialization;
private String rid;

public DoctorEntity(Object rid, Object name,Object specialization){
    this.name=(String) name;
    this.specialization=(String) specialization;
    this.rid=(String) rid;
}

public String getName() {
    return name;
}

public String getSpecialization() {
    return specialization;
}
public String getRid() {
    return rid;
}}

错误显示为 异常:“java.lang.ClassCastException” 消息:“com.tinkerpop.blueprints.impls.orient.OrientVertex 无法转换为 java.lang.String”

Answer 1

您可以将 Vertex 转换为 OrientVertex 并调用 getIdentity().toString()。 请参阅here .

for (Vertex v : graph.getVerticesOfClass("DoctorA")) {
    OrientVertex vertex = (OrientVertex) v;
    dbentity.DoctorEntity disent = new DoctorEntity(vertex.getIdentity().toString(), v.getProperty("NAME"), v.getProperty("specialization"));
    al.add(disent);
}