属性映射的列数错误

Question

我使用的是休眠 4.2.21 版本。我有部分实体，我使用了 @Embedded 和 @Embeddable 注释。尝试运行 project 时，它给出了异常；

属性映射的列数错误：com.demo.School.teacher 类型：对象

学校实体类

@Entity(name = "School")
public class{
   public String schoolId;
   public String schoolName;

   @Embedded
   @AttributeOverrides({
      @AttributeOverride(name = "teacherName",column = @Column(name = "teacherName")),
      @AttributeOverride(name = "teacherPhone",column = @Column(name = "teacherPhone")),
   })
   @XmlElements({
      @XmlElement(name = "TeacherU", type = TeacherU.class),
      @XmlElement(name = "TeacherH", type = TeacherH.class)
   })
   public object teacher;

   //getters and setters 
}

教师（大学）实体类

@Embeddable
public class TeacherU {
   public String teacherName;
   public String teacherPhone;

   //getters and setters 
}

教师（高中）实体类

@Embeddable
public class TeacherH {
   public String teacherName;
   public String teacherPhone;

   //getters and setters 
}

Answer 1

教师不应该被声明为对象，改变

public object teacher;

到

public Teacher teacher;